BQ24072RGTTG4中文资料应用文章市场行情现货热卖使用介绍-中国IC网-芯三七

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

1

FEATURES

DESCRIPTION

•

Fully Compliant USB Charger

–

Selectable 100mA and 500mA Maximum

Input Current

The bq2407x series of devices are integrated Li-ion

linear chargers and system power path management

devices

targeted

at

space-limited

portable

100mA Maximum Current Limit Ensures

Compliance to USB-IF Standard

applications. The devices operate from either a USB

port or AC adapter and support charge currents up to

1.5A. The input voltage range with input overvoltage

protection supports unregulated adapters. The USB

input current limit accuracy and start up sequence

allow the bq2407x to meet USB-IF inrush current

specification. Additionally, the input dynamic power

management (V_IN-DPM) prevents the charger from

crashing incorrectly configured USB sources.

Input based Dynamic Power Management

(V_IN-DPM) for Protection Against Poor USB

Sources

•

28V Input Rating with Overvoltage Protection

Integrated Dynamic Power Path Management

(DPPM) Function Simultaneously and

Independently Powers the System and

Charges the Battery

The bq2407x features dynamic power path

management (DPPM) that powers the system while

simultaneously and independently charging the

battery. The DPPM circuit reduces the charge current

when the input current limit causes the system output

to fall to the DPPM threshold; thus, supplying the

system load at all times while monitoring the charge

current separately. This feature reduces the number

of charge and discharge cycles on the battery, allows

for proper charge termination and enables the system

to run with a defective or absent battery pack.

•

Supports up to 1.5A Charge Current with

Current Monitoring Output (ISET)

Programmable Input Current Limit up to 1.5A

for Wall Adapters

System Output Tracks Battery Voltage

(bq24072)

•

Programmable Termination Current (bq24074)

Battery Disconnect Function with SYSOFF

Input (bq24075, bq24079)

Typical Application Circuit

•

Programmable Pre-Charge and Fast-Charge

Safety Timers

1kW

Reverse Current, Short-Circuit and Thermal

Protection

•

NTC Thermistor Input

Proprietary Start Up Sequence Limits Inrush

Current

IN

SYSTEM

IN

OUT

10

11

13

1mF

4.7mF

•

Status Indication – Charging/Done, Power

Good

bq24075

bq24079

5

8

EN2

BAT

VSS

2

3

Small 3 mm × 3 mm 16 Lead QFN Package

System

ON/OFF

Control

15

SYSOFF

4.7mF

PACK+

TEMP

1

TS

APPLICATIONS

•

Smart Phones

PACK-

Portable Media Players

Portable Navigation Devices

Low-Power Handheld Devices

1.18kW

1.13kW

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (CONTINUED)

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally

discharged battery. The power-path management architecture also permits the battery to supplement the system

current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller

adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge

phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the

internal temperature threshold is exceeded. The charger power stage and charge current sense functions are

fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status

display, and charge termination. The input current limit and charge current are programmable using external

resistors.

ORDERING INFORMATION

PART NUMBER

OPTIONAL

FUNCTION

V_OVP

V_BAT(REG)

V_OUT(REG)

V_DPPM

MARKING

(1)(2)

bq24072RGTR

bq24072RGTT

bq24073RGTR

bq24073RGTT

bq24074RGTR

bq24074RGTT

bq24075RGTR

bq24075RGTT

bq24079RGTR

bq24079RGTT

6.6 V

10.5 V

6.6 V

4.2V

4.1V

V_BAT+ 225 mV

4.4 V

V_O(REG)– 100 mV

4.3 V

TD

CKP

CKQ

BZF

CDU

ODI

TD

4.4 V

TD

4.4 V

ITERM

SYSOFF

4.4 V

5.5 V

4.3 V

5.5 V

4.3 V

5.5 V

4.3 V

ODI

(1) The RGT package is available in the following options:

R - taped and reeled in quantities of 3,000 devices per reel.

T - taped and reeled in quantities of 250 devices per reel.

(2) This product is RoHS compatible, including a lead concentration that does not exceed 0.1% of total product weight, and is suitable for

use in specified lead-free soldering processes. In addition, this product uses package materials that do not contain halogens, including

bromine (Br) or antimony (Sb) above 0.1% of total product weight.

2

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

over the 0°C to 125°C operating free-air temperature range (unless otherwise noted)

VALUE

–0.3 to 28

–0.3 to 5

UNIT

V

IN (with respect to VSS)

BAT (with respect to VSS)

V

V_I

Input Voltage

Input Current

OUT, EN1, EN2, CE, TS, ISET, PGOOD, CHG, ILIM, TMR, ITERM,

SYSOFF, TD (with respect to VSS)

–0.3 to 7

V

I_I

IN

1.6

A

OUT

5

Output Current

(Continuous)

I_O

BAT (Discharge mode)

BAT (Charging mode)

CHG, PGOOD

A

1.5⁽²⁾

A

Output Sink Current

Junction temperature

Storage temperature

15

mA

°C

T_J

–40 to 150

–65 to 150

T_stg

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage

values are with respect to the network ground terminal unless otherwise noted.

(2) The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces

charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge

current may not be reached.

DISSIPATION RATINGS

POWER RATING

PACKAGE⁽¹⁾

R_θJA

R_θJC

T_A≤ 25°C

T_A= 85°C

(2)

RGT

39.47 °C/W

2.4 °C/W

2.3 W

225mW

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

(2) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. The pad is

connected to the ground plane by a 2x3 via matrix.

RECOMMENDED OPERATING CONDITIONS

MIN

4.35

MAX

26

UNIT

IN voltage range

V

V_I

’72, ’73, ‘75, '79

‘74

6.4

IN operating voltage range

V

10.2

1.5

I_IN

Input current, IN pin

A

I_OUT

I_BAT

I_CHG

T_J

Current, OUT pin

4.5

Current, BAT pin (Discharging)

Current, BAT pin (Charging)

Junction Temperature

4.5

A

1.5⁽¹⁾

125

8000

3000

15

A

–40

1100

590

0

°C

Ω

R_ILIM

R_ISET

R_ITERM

R_TMR

Maximum input current programming resistor

(2)

Fast-charge current programming resistor

Ω

Termination current programming resistor

Timer programming resistor

kΩ

18

72

(1) The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces

charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge

current may not be reached.

(2) Use a 1% tolerance resistor for R_ISETto avoid issues with the R_ISETshort test when using the maximum charge current setting.

Submit Documentation Feedback

3

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

ELECTRICAL CHARACTERISTICS

Over junction temperature range (0° ≤ T_J≤ 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT

UVLO

V_hys

Undervoltage lock-out

V_IN: 0 V → 4 V

V_IN: 4 V → 0 V

3.2

3.3

3.4

V

Hysteresis on UVLO

200

300

mV

Input power detected when V_IN> V_BAT+ V_IN(DT)

V_BAT= 3.6 V, VIN: 3.5 V → 4 V

V_IN(DT)

Input power detection threshold

Hysteresis on V_IN(DT)

55

20

80

130

mV

ms

V_hys

V_BAT= 3.6 V, V_IN: 4 V → 3.5 V

Time measured from V_IN: 0 V → 5 V 1 µs

rise-time to PGOOD = LO

t_DGL(PGOOD)

Deglitch time, input power detected status

1.2

V_IN: 5 V → 7 V

V_IN: 5 V → 11 V

V_IN: 7 V → 5V

V_IN: 11 V → 5 V

(’72, ’73, ’75, '79)

(’74)

6.4

6.6

10.5

110

175

50

6.8

V_OVP

V_hys

Input overvoltage protection threshold

Hysteresis on OVP

V

10.2

10.8

(’72, ’73, ’75, '79)

(’74)

mV

t_DGL(OVP)

t_REC

Input overvoltage blanking time (OVP fault deglitch)

Input overvoltage recovery time

µs

Time measured from V_IN: 11 V → 5 V with 1 µs

fall-time to PGOOD = LO

1.2

ms

ILIM, ISET SHORT CIRCUIT DETECTION (CHECKED DURING STARTUP)

I_SC

Current source

V_IN> UVLO and V_IN> V_BAT+ V_IN(DT)

1.3

mA

mV

V_SC

520

QUIESCENT CURRENT

CE = LO or HI, input power not detected,

No load on OUT pin, T_J= 85°C

I_BAT(PDWN)

Sleep current into BAT pin

6.5

µA

EN1= HI, EN2=HI, V_IN= 6 V, T_J= 85°C

EN1= HI, EN2=HI, V_IN= 10 V, T_J= 85°C

50

I_IN

Standby current into IN pin

Active supply current, IN pin

200

CE = LO, V_IN= 6 V, no load on OUT pin,

V_BAT> V_BAT(REG), (EN1, EN2) ≠ (HI, HI)

I_CC

1.5

mA

POWER PATH

V_DO(IN-OUT)

V_IN– V_OUT

V_IN= 4.3 V, I_IN= 1A, V_BAT= 4.2V

I_OUT= 1 A, V_IN= 0 V, V_BAT> 3 V

V_IN> V_OUT+ V_DO(IN-OUT), V_BAT< 3.2 V

300

50

475

100

3.5

mV

V_DO(BAT-OUT)

V_BAT– V_OUT

3.3

3.4

OUT pin voltage regulation (bq24072)

V_BAT

150mV

+

V_BAT

225mV

+

V_BAT

270mV

+

V_IN> V_OUT+ V_DO(IN-OUT), V_BAT≥ 3.2 V

V_O(REG)

V

OUT pin voltage regulation (bq24073, bq24074)

OUT pin voltage regulation (bq24075, bq24079)

V_IN> V_OUT+ V_DO(IN-OUT)

EN1 = LO, EN2 = LO

4.3

5.4

90

4.4

5.5

4.5

5.6

95

100

500

mA

I_INmax

Maximum input current

EN1 = HI, EN2 = LO

450

475

EN2 = HI, EN1 = LO

K_ILIM/R_ILIM

1610

1525

A

I_LIM= 500mA to 1.5A

1500

1330

200

1720

1500

AΩ

K_ILIM

Maximum input current factor

I_LIM= 200mA to 500mA

EN2 = HI, EN1 = LO, R_ILIM= 8 kΩ to 1.1 kΩ

I_INmax

V_IN-DPM

Programmable input current limit range

mA

V

Input voltage threshold when input current is

reduced

EN2 = LO, EN1 = X

4.35

4.5

4.63

V_O(REG)

180mV

–

V_O(REG)

100mV

–

V_O(REG)–

30mV

(’72, ’73, ’74)

V

Output voltage threshold when charging current is

reduced

V_DPPM

(’75, '79)

4.2

4.3

4.4

V_BAT= 3.6V, R_ILIM= 1.5kΩ, R_LOAD= 10Ω → 2Ω

V

_OUT≤ V_BAT

–40mV

V_BSUP1

Enter battery supplement mode

V_BAT= 3.6V, R_ILIM= 1.5kΩ, R_LOAD= 2Ω → 10Ω

V_OUT≥

V_BAT–20mV

V_BSUP2

V_O(SC1)

V_O(SC2)

Exit battery supplement mode

V

Output short-circuit detection threshold, power-on

V_IN> V_UVLOand V_IN> V_BAT+ V_IN(DT)

0.8

0.9

1

Output short-circuit detection threshold, supplement

mode V_BAT– V_OUT> V_O(SC2)indicates short-circuit

200

250

300

mV

t_DGL(SC2)

t_REC(SC2)

Deglitch time, supplement mode short circuit

Recovery time, supplement mode short circuit

250

60

µs

ms

4

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

ELECTRICAL CHARACTERISTICS (continued)

Over junction temperature range (0° ≤ T_J≤ 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

BATTERY CHARGER

I_BAT

Source current for BAT pin short-circuit detection

BAT pin short-circuit detection threshold

V_BAT= 1.5V

V_BATrising

4

1.6

7.5

1.8

11

2

mA

V

V_BAT(SC)

('72, '73, '74, '75)

('79)

4.16

4.059

2.9

4.20

4.100

3

4.23

4.141

3.1

V

V_BAT(REG)

Battery charge voltage

V_LOWV

Pre-charge to fast-charge transition threshold

Deglitch time on pre-charge to fast-charge transition

Deglitch time on fast-charge to pre-charge transition

V_IN> V_UVLOand V_IN> V_BAT+ V_IN(DT)

V

t_DGL1(LOWV)

t_DGL2(LOWV)

25

ms

25

V_BAT(REG)> V_BAT> V_LOWV, V_IN= 5 V CE = LO,

EN1 = LO, EN2 = HI

Battery fast charge current range

Battery fast charge current

300

1500

mA

A

I_CHG

CE = LO, EN1= LO, EN2 = HI,

V_BAT> V_LOWV, V_IN= 5 V, I_INmax > I_CHG, no load on OUT pin,

thermal loop and DPPM loop not active

K_ISET/R_ISET

K_ISET

Fast charge current factor

Pre-charge current

797

890

K_PRECHG/R_ISET

88

975

AΩ

A

I_PRECHG

K_PRECHG

Pre-charge current factor

70

106

AΩ

A

CE = LO, (EN1, EN2) ≠ (LO, LO),

0.09×I_CHG

0.1×I_CHG

0.11×I_CHG

V_BAT> V_RCH, t < t_MAXCH, V_IN= 5 V, DPPM loop and thermal

loop not active

Termination comparator detection threshold

(internally set)

I_TERM

CE = LO, (EN1, EN2) = (LO, LO),

0.027×I_CHG

72

0.033×I_CHG0.040×I_CHG

V_BAT> V_RCH, t < t_MAXCH, V_IN= 5 V, DPPM loop and thermal

loop not active

I_BIAS(ITERM)

I_TERM

Current for external termination-setting resistor

V_IN> V_UVLOand V_IN> V_BAT+ V_IN(DT)

75

78

µA

Termination current threshold (externally set)

(bq24074)

A

K_ITERM× R_ITERM/ R_ISET

USB500 or ISET mode(EN1, EN2) ≠ (LO, LO)

A

0.0225

0.0300

0.0375

0.012

CE = LO, V_BAT> V_RCH, t < t_MAXCH, V_IN= 5 V, DPPM loop and

thermal loop not active

K Factor for termination detection threshold

(externally set) (bq24074)

K_ITERM

USB100 mode (EN1, EN2) = (LO, LO),

CE = LO, V_BAT> V_RCH, t < t_MAXCH, V_IN= 5 V, DPPM loop and

thermal loop not active

0.008

0.0100

25

t_DGL(TERM)

V_RCH

t_DGL(RCH)

t_DGL(NO-IN)

Deglitch time, termination detected

ms

V

V_BAT(REG)

–140mV

V_BAT(REG)

–100mV

V_BAT(REG)

–60mV

Recharge detection threshold

V_IN> V_UVLOand V_IN> V_BAT+ V_IN(DT)

Deglitch time, recharge threshold detected

Delay time, input power loss to OUT LDO turn-off

62.5

20

ms

V_BAT= 3.6 V. Time measured from

V_IN: 5 V → 3 V 1 µs fall-time

I_BAT(DET)

t_DET

Sink current for battery detection

Battery detection timer

V_BAT= 2.5V

5

7.5

10

mA

ms

BAT high or low

250

BATTERY CHARGING TIMERS

t_PRECHG

t_MAXCHG

t_PRECHG

t_MAXCHG

K_TMR

Pre-charge safety timer value

TMR = floating

1440

1800

18000

2160

s

Charge safety timer value

Pre-charge safety timer value

Charge safety timer value

Timer factor

TMR = floating

14400

21600

18 kΩ < R_TMR< 72 kΩ

R_TMR× K_TMR

10×R_TMR×K_TMR

48

s

36

60

s/kΩ

BATTERY-PACK NTC MONITOR⁽¹⁾

I_NTC

NTC bias current

V_IN> UVLO and V_IN> V_BAT+ V_IN(DT)

Battery charging, V_TSFalling

72

75

78

µA

mV

ms

V

V_HOT

High temperature trip point

270

300

330

V_HYS(HOT)

V_COLD

Hysteresis on high trip point

Battery charging, V_TSRising from V_HOT

Battery charging, V_TSRising

30

2100

Low temperature trip point

2000

2200

V_HYS(COLD)

t_DGL(TS)

V_DIS(TS)

Hysteresis on low trip point

Battery charging, V_TSFalling from V_COLD

TS fault detected to charger disable

TS unconnected

300

Deglitch time, pack temperature fault detection

TS function disable threshold (bq24072, bq24073)

50

V_IN- 200mV

THERMAL REGULATION

T_J(REG)

Temperature regulation limit

125

155

20

°C

T_J(OFF)

Thermal shutdown temperature

Thermal shutdown hysteresis

T_JRising

T_J(OFF-HYS)

(1) These numbers set trip points of 0°C and 50°C while charging, with 3°C hysteresis on the trip points, with a Vishay Type 2 curve NTC

with an R25 of 10 kΩ.

Submit Documentation Feedback

5

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

Over junction temperature range (0° ≤ T_J≤ 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

LOGIC LEVELS ON EN1, EN2, CE, SYSOFF, TD

V_IL

V_IH

I_IL

Logic LOW input voltage

Logic HIGH input voltage

Input sink current

0

0.4

6

V

1.4

V_IL= 0V

1

µA

I_IH

Input source current

V_IH= 1.4V

10

LOGIC LEVELS ON PGOOD, CHG

V_OL

Output LOW voltage

I_SINK= 5 mA

0.4

V

RGT PACKAGE

(Top View)

16 15 14 13

1

2

3

4

1

12

11

12

1

2

3

4

12

ILIM

OUT

CHG

ILIM

OUT

CHG

TS

BAT

CE

TS

ILIM

OUT

CHG

TS

BAT

CE

2

bq24072

bq24073

11

10

9

11

10

9

BAT

bq24075

bq24074

3

bq24079 10

BAT

4

9

CE

5

6

7

8

5

6

7

8

5

6

7

8

PIN FUNCTIONS

NO.

I/O

DESCRIPTION

NAME

'72, '73

'74

'75, '79

External NTC Thermistor Input. Connect the TS input to the NTC thermistor in the battery pack. TS monitors

a 10kΩ NTC thermistor. For applications that do not utilize the TS function, connect a 10kΩ fixed resistor

from TS to VSS to maintain a valid voltage level on TS.

TS

1

I

Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of the

battery. Bypass BAT to VSS with a 4.7 µF to 47 µF ceramic capacitor.

BAT

2, 3

4

2, 3

4

2, 3

4

I/O

Charge Enable Active-Low Input. Connect CE to a high logic level to place the battery charger in standby

mode. In standby mode, OUT is active and battery supplement mode is still available. Connect CE to a low

logic level to enable the battery charger. CE is internally pulled down with ~285 kΩ. Do not leave CE

unconnected to ensure proper operation.

CE

I

EN2

EN1

5

6

5

6

5

6

I

Input Current Limit Configuration Inputs. Use EN1 and EN2 control the maximum input current and enable

USB compliance. See Table 2 for the description of the operation states. EN1 and EN2 are internally pulled

down with ≈285 kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation.

Open-drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is

detected. PGOOD is high-impedance when the input power is not within specified limits. Connect PGOOD to

the desired logic voltage rail using a 1kΩ-100kΩ resistor, or use with an LED for visual indication.

PGOOD

VSS

7

8

9

7

8

9

7

8

9

O

–

Ground. Connect to the thermal pad and to the ground rail of the circuit.

Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high

impedance when charging is complete and when charger is disabled. Connect CHG to the desired logic

voltage rail using a 1kΩ-100kΩ resistor, or use with an LED for visual indication.

CHG

O

System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and

above the regulation voltage. When the input is out of the operation range, OUT is connected to V_BATexcept

when SYSOFF is high (bq24075 and bq24079 only). Connect OUT to the system load. Bypass OUT to VSS

with a 4.7 µF to 47 µF ceramic capacitor.

OUT

ILIM

IN

10, 11

12

10, 11

12

10, 11

12

O

I

Adjustable Current Limit Programming Input. Connect a 1100 Ω to 8 kΩ resistor from ILIM to VSS to program

the maximum input current (EN2=1, EN1=0). The input current includes the system load and the battery

charge current. Leaving ILIM unconnected disables all charging.

Input Power Connection. Connect IN to the external DC supply (AC adapter or USB port). The input operating

range is 4.35V to 6.6V (bq24072, bq24073, bq24075, and bq24079) or 4.35V to 10.5V (bq23074). The input

can accept voltages up to 26V without damage but operation is suspended. Connect bypass capacitor 1 µF

to 10 µF to VSS.

13

I

6

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

PIN FUNCTIONS (continued)

NO.

'74

I/O

DESCRIPTION

NAME

'72, '73

'75, '79

Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to VSS

to disable all safety timers. Connect a 18 kΩ to 72 kΩ resistor between TMR and VSS to program the timers

a desired length. Leave TMR unconnected to set the timers to the default values.

TMR

14

–

14

I

Termination Disable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable

charger termination. TD is checked during startup only and cannot be changed during operation. See the TD

section in this datasheet for a description of the behavior when termination is disabled. TD is internally pulled

down to VSS with ~285 kΩ. Do not leave TD unconnected to ensure proper operation.

TD

15

–

Termination Current Programming Input. Connect a 0 Ω to 15 kΩ resistor from ITERM to VSS to program the

termination current. Leave ITERM unconnected to set the termination current to the default 10% termination

threshold.

ITERM

SYSOFF

15

–

System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system output.

When an adapter is connected, charging is also disabled. Connect SYSOFF low for normal operation.

SYSOFF is internally pulled up to V_BATthrough a large resistor (~5 MΩ). Do not leave SYSOFF unconnected

to ensure proper operation.

–

15

Fast Charge Current Programming Input. Connect a 590 Ω to 3 kΩ resistor from ISET to VSS to program the

fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage at ISET

reflects the actual charging current and can be used to monitor charge current. See the SubSec2 1.1 section

for more details.

ISET

16

I/O

–

There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device.

The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not

use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all

times.

Thermal

Pad

Table 1. EN1/EN2 Settings

EN2

EN1

Maximum input current into IN pin

100 mA. USB100 mode

0

1

0

1

0

1

500 mA. USB500 mode

Set by an external resistor from ILIM to VSS

Standby (USB suspend mode)

Submit Documentation Feedback

7

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

SIMPLIFIED BLOCK DIAGRAM

250mV

V_BAT

V_O(SC1)

OUT-SC1

OUT-SC2

t_DGL(SC2)

Q1

IN

OUT

ISET

EN2

Short Detect

225mV

Precharge

V_IN-LOW

2.25V

Fastcharge

USB100

USB500

T_J

ILIM

V_{REF- ILIM}

T_J(REG)

USB-susp

Short Detect

V_DPPM

V_O(REG)

V_OUT

Q2

EN2

EN1

V_BAT(REG)

BAT

V_BAT

V_OUT

CHARGEPUMP

SYSOFF

bq24075

bq24079

I_{BIAS- ITERM}

40mV

Supplement

V_LOWV

225mV

(’72, ’73, ’75)

ITERM

bq24074

V_RCH

V_BAT(SC)

~3V

I TERM-floating

V_IN

I_NTC

BAT-SC

V_BAT+ V

IN-DT

t_DGL(NO-IN)

V_HOT

TS

t_DGL(TS)

t_DGL(PGOOD)

Charge Control

V_UVLO

V_OVP

V_COLD

t_BLK(OVP)

V_DIS(TS)

EN1

EN2

USB Suspend

TD

(bq24072,

bq24073)

CE

CHG

Halt timers

Reset timers

V_IPRECHG

V_ICHG

Dynamically

Controlled

Oscillator

PGOOD

V_ISET

Fast-Charge

Timer

Timer fault

TMR

Pre-Charge

Timer

~100mV

Timers disabled

8

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

TYPICAL CHARACTERISTICS

V_IN= 6V, EN1=1, EN2=0, bq24073 application circuit, T_A= 25°C, unless otherwise noted.

ADAPTER PLUG-IN

BATTERY CONNECTED

BATTERY DETECTION

BATTERY INSERTED

BATTERY DETECTION

BATTERY REMOVED

R_LOAD= 10Ω

V_IN

V_CHG

5 V/div

V_CHG

5 V/div

1 A/div

5 V/div

1 A/div

Charging Initiated

V_OUT

4.4 V

500 mV/div

5 V/div

V_BAT

3.6 V

I_BAT

V_PGOOD

2 V/div

Battery

Removed

V_BAT

500 mA/div

I_BAT

Battery Inserted

Battery Detection Mode

400 ms/div

Battery Detection Mode

400 ms/div

4 ms/div

Figure 1.

Figure 2.

Figure 3.

ENTERING AND EXITING BATTERY

SUPPLEMENT MODE

R_LOAD= 25ΩTO 4.5Ω

bq24074

ENTERING AND EXITING BATTERY

SUPPLEMENT MODE

R_LOAD= 20ΩTO 4.5Ω

bq24072

ENTERING AND EXITING DPPM

MODE

R_LOAD= 20Ω to 9Ω

1 A/div

I_OUT

500 mA/div

I_OUT

1 A/div

500 mA/div

I_BAT

Supplement Mode

500 mA/div

Supplement Mode

I_BAT

500 mA/div

200 mV/div

V_OUT

3.825 V

200 mV/div

V_OUT

4.4 V

V_BAT

V_OUT

4.4 V

V_BAT

3.8 V

3.6 V

500 mV/div

Tracking to V_BAT+225 mV

1 ms/div

400 ms/div

1 ms/div

Figure 4.

Figure 5.

Figure 6.

SYSTEM ON/OFF WITH INPUT

CONNECTED

OVP FAULT

V_IN= 6V to 15V

R_LOAD= 10Ω

V_IN= 6V

CHARGER ON/OF USING CE

bq24075, bq24079

V_CE

5 V/div

V_SYSOFF

5 V/div

10 V/div

V_IN

V_CHG

5 V/div

1 V/div

V_OUT

5.5 V

4.4 V

V_BAT

2 V/div

V_BAT

4 V

500 mV/div

3.6 V

4.2 V

Mandatory Precharge

500 mA/div

I_BAT

1 A/div

I_BAT

400 ms/div

10 ms/div

40 ms/div

Figure 7.

Figure 8.

Figure 9.

Submit Documentation Feedback

9

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

TYPICAL CHARACTERISTICS (continued)

V_IN= 6V, EN1=1, EN2=0, bq24073 application circuit, T_A= 25°C, unless otherwise noted.

SYSTEM ON/OFF WITH INPUT NOT

CONNECTED

V_IN= 0V

DROPOUT VOLTAGE

vs

bq24075, bq24079

THERMAL REGULATION

TEMPERATURE

600

500

400

0.7

0.6

I_L= 1 A

V_SYSOFF

5 V/div

0.5

0.4

0.3

V_BAT

4 V

2 V/div

300

200

V_OUT

Battery Powering

System

0.2

0.1

0

System Power Off

I_BAT

500 mA/div

100

0

4 ms/div

120

125

130

135

140

145

125

0

25

100

50

75

Temperature - ^o

C

T_J- Junction Temperature - °C

Figure 10.

Figure 11.

bq24072

Figure 12.

DROPOUT VOLTAGE

vs

TEMPERATURE

NO INPUT SUPPLY

bq24072

OUTPUT REGULATION VOLTAGE

vs

BATTERY VOLTAGE

TEMPERATURE

4.6

4.4

120

3.80

3.78

3.76

3.74

3.72

3.70

3.68

3.66

3.64

3.62

3.60

V_IN= 5 V

V_IN= 5 V,

V_BAT= 3.5 V,

I_L= 1 A

100

80

4.2

4

VBAT = 3 V

3.8

3.6

3.4

3.2

3

60

40

VBAT = 3.9 V

20

0

125

2

0

50

75

100

3

4.5

25

2.5

3.5

4

0

25

50

75

100

125

T_J- Junction Temperature - °C

V_BAT- Battery Voltage - V

T_J- Junction Temperature - °C

Figure 13.

Figure 14.

Figure 15.

bq24073/ 74

bq24075, bq24079

OUTPUT REGULATION VOLTAGE

BAT REGULATION VOLTAGE

vs

TEMPERATURE

4.45

4.43

4.40

4.38

4.35

5.75

5.70

5.65

5.60

4.210

4.205

4.200

4.195

V_IN= 6 V,

I_L= 1 A

V_IN= 5 V,

I_L= 1 A

5.55

5.50

5.45

5.40

4.190

4.185

4.180

5.35

4.33

4.30

5.30

5.25

0

50

75

100

125

25

0

25

50

75

100

125

30

25

10

15

20

0

5

T_J- Junction Temperature - °C

Figure 16.

Figure 17.

Figure 18.

10

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

TYPICAL CHARACTERISTICS (continued)

V_IN= 6V, EN1=1, EN2=0, bq24073 application circuit, T_A= 25°C, unless otherwise noted.

bq24072/ 73/ 75/ 79

OVERVOLTAGE PROTECTION

THRESHOLD

bq24074

OVERVOLTAGE PROTECTION

THRESHOLD

bq24074

INPUT CURRENT LIMIT

vs

TEMPERATURE

INPUT VOLTAGE

6.70

6.65

6.60

6.55

10.70

10.65

10.60

10.55

10.50

10.45

800

700

600

500

10.5 V

RILIM

6.6 V

V_IRising

USB500

400

300

V_IFalling

10.40

10.35

10.30

10.25

10.20

V_IFalling

200

6.50

6.45

USB100

100

0

5

6

7

8

9

10

0

25

75

125

0

25

50

75

100

125

50

100

V_I- Input Voltage - V

T_J- Junction Temperature - °C

Figure 19.

Figure 20.

Figure 21.

FASTCHARGE CURRENT

vs

BATTERY VOLTAGE

FASTCHARGE CURRENT

vs

BATTERY VOLTAGE

PRECHARGE CURRENT

vs

BATTERY VOLTAGE

310

305

300

295

290

105

104

1.05

1.03

R_ISET= 900 W

R_ISET= 3 kW

103

102

101

100

99

1.01

0.99

98

0.97

0.95

97

285

280

96

95

3.6

3

3.8

2

2.2

2.4

2.6

2.8

3

3.4

4

4.2

3

3.2

3.4

3.6

3.8

4

4.2

3.2

V_BAT- Battery Voltage - V

Figure 22.

Figure 23.

Figure 24.

PRECHARGE CURRENT

vs

BATTERY VOLTAGE

31.5

R_ISET= 3 kW

31

30.5

30

29.5

29

28.5

2

2.2

2.4

2.6

2.8

3

V_BAT- Battery Voltage - V

Figure 25.

Submit Documentation Feedback

11

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

APPLICATION CIRCUITS

V_IN= UVLO to V_OVP, I_FASTCHG= 800mA, I_IN(MAX)= 1.3A, Battery Temperature Charge Range = 0°C to 50°C, 6.25

hour Fastcharge Safety Timer

R4

1.5 kW

R5

1.5 kW

SYSTEM

Adaptor

DC+

IN

OUT

C2

4.7 mF

C1

1 mF

GND

VSS

bq24072

bq24073

HOST

EN2

EN1

TS

TD

CE

BAT

C3

4.7 mF

PACK+

TEMP

R1

46.4 kW

R2

1.18 kW

R3

1.13 kW

PACK-

Figure 26. Using bq24072/ bq24073 in a Host Controlled Charger Application

12

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

V_IN= UVLO to V_OVP, I_FASTCHG= 800mA, I_IN(MAX)= 1.3A, I_TERM= 110mA, Battery Temperature Charge

Range = 0°C to 50°C, Safety Timers disabled

R4

R5

1.5 kW

SYSTEM

Adaptor

DC+

IN

OUT

C2

4.7 mF

C1

1 mF

GND

VSS

bq24074

EN2

EN1

TS

TMR

CE

BAT

C3

4.7mF

PACK+

TEMP

R1

4.12 kW

R2

1.18 kW

R3

1.13 kW

PACK-

Figure 27. Using bq24074 in a Stand Alone Charger Application

V_IN= UVLO to V_OVP, I_FASTCHG= 800mA, I_IN(MAX)= 1.3A, Battery Temperature Charge Range = 0°C to 50°C,

6.25 hour Fastcharge Safety Timer

R4

1.5 kW

R5

1.5 kW

SYSTEM

Adaptor

DC+

IN

OUT

C2

4.7 mF

C1

1 mF

GND

VSS

bq24075

bq24079

HOST

EN2

EN1

TS

SYSOFF

CE

BAT

C3

4.7 mF

PACK+

TEMP

R1

46.4 kW

R2

1.18 kW

R3

1.13 kW

PACK-

Figure 28. Using bq24075 or bq24079 to Disconnect the Battery from the System

Submit Documentation Feedback

13

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

EXPLANATION OF DEGLITCH TIMES AND COMPARATOR HYSTERESIS

Figures not to scale

V

OVP

V

- V

hys(OVP)

OVP

V

IN

Typical Input Voltage

Operating Range

t < t

DGL(OVP)

V

+ V

IN(DT)

BAT

V

+ V

- V

IN(DT) hys(INDT)

BAT

UVLO

UVLO - V

hys(UVLO)

PGOOD

t

DGL(PGOOD)

t

DGL(OVP)

DGL(NO-IN)

t

DGL(PGOOD)

Figure 29. Power-Up, Power-Down, Power Good Indication

t

V

DGL1(LOWV)

BAT

V

LOWV

t < t

DGL1(LOWV)

t

DGL2(LOWV)

t

t < t

DGL2(LOWV)

DGL1(LOWV)

I

CHG

Fast-Charge

Pre-Charge

I

PRE-CHG

Pre-Charge

Figure 30. Pre- to Fast-Charge, Fast- to Pre-Charge Transition – t_DGL1(LOWV), t_DGL2(LOWV)

V

BAT

V

RCH

Re-Charge

t < t

DGL(RCH)

t

DGL(RCH)

Figure 31. Recharge – t_DGL(RCH)

14

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

Turn

Q2 OFF

Force

Q2 ON

Force

Q2 ON

Turn

Q2 OFF

t

REC(SC2)

V

- V

OUT

BAT

Recover

V

O(SC2)

t

t < t

DGL(SC2)

Figure 32. OUT Short-Circuit – Supplement Mode

V

COLD

V

- V

hys(COLD)

COLD

Suspend

Charging

Resume

Charging

t < t

t

DGL(TS)

V

TS

V

- V

hys(HOT)

HOT

V

HOT

Figure 33. Battery Pack Temperature Sensing – TS Pin. Battery Temperature Increasing

Submit Documentation Feedback

15

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

DETAILED FUNCTIONAL DESCRIPTION

The bq2407x devices are integrated Li-Ion linear chargers and system power path management devices targeted

at space-limited portable applications. The device powers the system while simultaneously and independently

charging the battery. This feature reduces the number of charge and discharge cycles on the battery, allows for

proper charge termination and enables the system to run with a defective or absent battery pack. It also allows

instant system turn-on even with a totally discharged battery. The input power source for charging the battery

and running the system can be an AC adapter or a USB port. The devices feature Dynamic Power Path

Management (DPPM), which shares the source current between the system and battery charging, and

automatically reduces the charging current if the system load increases. When charging from a USB port, the

input dynamic power management (V_IN-DPM) circuit reduces the input current if the input voltage falls below a

threshold, preventing the USB port from crashing. The power-path architecture also permits the battery to

supplement the system current requirements when the adapter cannot deliver the peak system currents.

UNDERVOLTAGE LOCKOUT (UVLO)

The bq2407X family remains in power down mode when the input voltage at the IN pin is below the undervoltage

threshold (UVLO).

During the power down mode the host commands at the control inputs (CE, EN1 and EN2) are ignored. The Q1

FET connected between IN and OUT pins is off, and the status outputs CHG and PGOOD are high impedance.

The Q2 FET that connects BAT to OUT is ON. (If SYSOFF is high, Q2 is off). During power down mode, the

V_OUT(SC2)circuitry is active and monitors for overload conditions on OUT.

POWER ON

When V_INexceeds the UVLO threshold, the bq2407x powers up. While V_INis below V_BAT+ V_IN(DT), the host

commands at the control inputs (CE, EN1 and EN2) are ignored. The Q1 FET connected between IN and OUT

pins is off, and the status outputs CHG and PGOOD are high impedance. The Q2 FET that connects BAT to

OUT is ON. (If SYSOFF is high, Q2 is off). During this mode, the V_OUT(SC2)circuitry is active and monitors for

overload conditions on OUT.

Once V_INrises above V_BAT+ V_IN(DT), PGOOD is driven low to indicate the valid power status and the CE, EN1,

and EN2 inputs are read. The device enters standby mode if (EN1 = EN2 = HI) or if an input overvoltage

condition occurs. In standby mode, Q1 is OFF and Q2 is ON so OUT is connected to the battery input. (If

SYSOFF is high, FET Q2 is off). During this mode, the V_OUT(SC2)circuitry is active and monitors for overload

conditions on OUT.

When the input voltage at IN is within the valid range: V_IN> UVLO AND V_IN> V_BAT+ V_IN(DT)AND V_IN< V_OVP, and

the EN1 and EN2 pins indicate that the USB suspend mode is not enabled [(EN1, EN2) ≠ (HI, HI)] all internal

timers and other circuit blocks are activated. The device then checks for short-circuits at the ISET and ILIM pins.

If no short conditions exists, the device switches on the input FET Q1 with a 100mA current limit to checks for a

short circuit at OUT. When V_OUTis above V_SC, the FET Q1 switches to the current limit threshold set by EN1,

EN2 and R_ILIMand the device enters into the normal operation. During normal operation, the system is powered

by the input source (Q1 is regulating), and the device continuously monitors the status of CE, EN1 and EN2 as

well as the input voltage conditions.

16

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

PGOOD = Hi-Z

CHG = Hi-Z

BATTFET ON

UVLO<V_IN<V_OVP

and

V_IN>V_BAT+V_IN(DT)

No

Yes

PGOOD = Low

Yes

EN1=EN2=1

No

ILIM or ISET short?

No

Begin Startup

I_IN(MAX)100mA

Yes

V_OUTshort?

No

Input Current

Limit set by EN1

and EN2

No

CE = Low

Yes

Begin Charging

Figure 34. Startup Flow Diagram

Submit Documentation Feedback

17

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

OVERVOLTAGE PROTECTION (OVP)

The bq2407x accepts inputs up to 28V without damage. Additionally, an overvoltage protection (OVP) circuit is

implemented that shuts off the internal LDO and discontinues charging when V_IN> V_OVPfor a period long than

t_DGL(OVP). When in OVP, the system output (OUT) is connected to the battery and PGOOD is high impedance.

Once the OVP condition is removed, a new power on sequence starts (See the SubSec2 0.1 section). The safety

timers are reset and a new charge cycle will be indicated by the CHG output.

DYNAMIC POWER-PATH MANAGEMENT

The bq2407x features an OUT output that powers the external load connected to the battery. This output is

active whenever a source is connected to IN or BAT. The following sections discuss the behavior of OUT with a

source connected to IN to charge the battery and a battery source only.

INPUT SOURCE CONNECTED (ADAPTER or USB)

With a source connected, the dynamic power-path management (DPPM) circuitry of the bq2407x monitors the

input current continuously. The OUT output for the bq24073/ 74/ 75/ 79 is regulated to a fixed voltage (V_O(REG)).

For the bq24072, OUT is regulated to 200mV above the voltage at BAT. When the BAT voltage falls below 3.2V,

OUT is clamped to 3.4V. This allows for proper startup of the system load even with a discharged battery. The

current into IN is shared between charging the battery and powering the system load at OUT. The bq2407x has

internal selectable current limits of 100mA (USB100) and 500mA (USB500) for charging from USB ports, as well

as a resistor-programmable input current limit.

The bq2407x is USB IF compliant for the inrush current testing. The USB spec allows up to 10µF to be hard

started, which establishes 50µC as the maximum inrush charge value when exceeding 100mA. The input current

limit for the bq2407x prevents the input current from exceeding this limit, even with system capacitances greater

than 10µF. Note that the input capacitance to the device must be selected small enough to prevent a violation

(<10µF), as this current is not limited. Figure 35 demonstrates the startup of the bq2407x and compares it to the

USB-IF specification.

10μC

50μC

100 μs/div

Figure 35. USB-IF Inrush Current Test

The input current limit selection is controlled by the state of the EN1 and EN2 pins as shown in Table 1. When

using the resistor-programmable current limit, the input current limit is set by the value of the resistor connected

from the ILIM pin to VSS, and is given by the equation:

I_IN-MAX= K_ILIM/R_ILIM

The input current limit is adjustable up to 1.5A. The valid resistor range is 1.1 kΩ to 8 kΩ.

When the IN source is connected, priority is given to the system load. The DPPM and Battery Supplement

modes are used to maintain the system load. Figure 37 and Figure 38 illustrate examples of the DPPM and

supplement modes. These modes are explained in detail in the following sections.

18

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

Input DPM Mode (V_IN-DPM)

The bq2407x utilizes the V_IN-DPM mode for operation from current-limited USB ports. When EN1 and EN2 are

configured for USB100 (EN2=0, EN1=0) or USB500 (EN2=0, EN2=1) modes, the input voltage is monitored. If

V_INfalls to V_IN-DPM, the input current limit is reduced to prevent the input voltage from falling further. This prevents

the bq2407x from crashing poorly designed or incorrectly configured USB sources. Figure 36 shows the V_IN-DPM

behavior to a current limited source. In this figure, the input source has a 400mA current limit and the device is in

USB500 mode (EN1=1, EN2=0).

I

OUT

200mA/div

Input collapses

V

IN

(5V)

500mV/div

Input regulated to V

IN_DPM

USB500 Current Limit

200mA/div

I

Input current limit is

reduced to prevent

crashing the supply

IN

I

BAT

4 ms/div

Figure 36. V_IN-DPM Waveform

DPPM Mode

When the sum of the charging and system load currents exceeds the maximum input current (programmed with

EN1, EN2 and ILIM pins), the voltage at OUT decreases. Once the voltage on the OUT pin falls to V_DPPM, the

bq2407x enters DPPM mode. In this mode, the charging current is reduced as the OUT current increases in

order to maintain the system output. Battery termination is disabled while in DPPM mode.

Battery Supplement Mode

While in DPPM mode, if the charging current falls to zero and the system load current increases beyond the

programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the

V_BSUP1threshold, the battery supplements the system load. The battery stops supplementing the system load

when the voltage at OUT rises above the V_BSUP2threshold.

During supplement mode, the battery supplement current is not regulated (BAT-FET is fully on), however there is

a short circuit protection circuit built in. Figure 5 demonstrates supplement mode. If during battery supplement

mode, the voltage at OUT drops V_O(SC2)below the BAT voltage, the OUT output is turned off if the overload

exists after t_DGL(SC2). The short circuit recovery timer then starts counting. After t_REC(SC2), OUT turns on and

attempts to restart. If the short circuit remains, OUT is turned off and the counter restarts. Battery termination is

disabled while in supplement mode.

Submit Documentation Feedback

19

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

1200 mA

900 mA

A

400 mA

0 mA

900 mA

500 mA

0 mA

500 mA

0 mA

-300 mA

3.8 V

3.7 V

~3.6 V

DPPM Loop Active

Supplement Mode

Figure 37. bq24072 DPPM and Battery Supplement Modes (V_OREG= V_BAT+ 225mV, V_BAT= 3.6V)

20

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

1200 mA

900 mA

A

400 mA

0 mA

900 mA

500 mA

0 mA

500 mA

0 mA

-300 mA

4.4 V

4.3 V

DPPM Loop Active

Supplement Mode

~3.6 V

Figure 38. bq24073 DPPM and Battery Supplement Modes (V_OREG= 4.4V, V_BAT= 3.6V)

INPUT SOURCE NOT CONNECTED

When no source is connected to the IN input, OUT is powered strictly from the battery. During this mode the

current into OUT is not regulated, similar to Battery Supplement Mode, however the short circuit circuitry is

active. If the OUT voltage falls below the BAT voltage by 250mV for longer than t_DGL(SC2), OUT is turned off. The

short circuit recovery timer then starts counting. After t_REC(SC2), OUT turns on and attempts to restart. If the short

circuit remains, OUT is turned off and the counter restarts. This ON/OFF cycle continues until the overload

condition is removed.

BATTERY CHARGING

Set CE low to initiate battery charging. First, the device checks for a short-circuit on the BAT pin by sourcing

I_BAT(SC)to the battery and monitoring the voltage. When the BAT voltage exceeds V_BAT(SC), the battery charging

continues. The battery is charged in three phases: conditioning pre-charge, constant current fast charge (current

regulation) and a constant voltage tapering (voltage regulation). In all charge phases, an internal control loop

monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is

exceeded.

Figure 39 illustrates a normal Li-Ion charge cycle using the bq2407x:

Submit Documentation Feedback

21

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

PRECHARGE

CC FAST CHARGE

CV TAPER

DONE

V

BAT(REG)

I

O(CHG)

Battery Current

Battery Voltage

V

LOWV

CHG = Hi-z

I

(PRECHG)

I

(TERM)

Figure 39. Typical Charge Cycle

In the pre-charge phase, the battery is charged at with the pre-charge current (I_PRECHG). Once the battery voltage

crosses the V_LOWVthreshold, the battery is charged with the fast-charge current (I_CHG). As the battery voltage

reaches V_BAT(REG), the battery is held at a constant voltage of V_BAT(REG)and the charge current tapers off as the

battery approaches full charge. When the battery current reaches I_TERM, the CHG pin indicates charging done by

going high-impedance.

Note that termination detection is disabled whenever the charge rate is reduced because of the actions of the

thermal loop, the DPPM loop or the V_IN(LOW)loop.

The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by

the equation

I_CHG= K_ISET/R_ISET

The charge current limit is adjustable up to 1.5A. The valid resistor range is 590Ω to 3 kΩ. Note that if I_CHGis

programmed as greater than the input current limit, the battery will not charge at the rate of I_CHG, but at the

slower rate of I_IN(MAX)(minus the load current on the OUT pin, if any). In this case, the charger timers will be

proportionately slowed down.

CHARGE CURRENT TRANSLATOR

When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET

input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external

charge current programming resistor, R_ISET, generates an analog voltage that can be monitored by an external

host to calculate the current sourced from BAT.

V_ISET= I_CHARGE/ 400 × R_ISET

22

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

Begin Charging

Yes

Battery short detected?

No

Start Precharge

CHG = Low

No

t_PRECHARGE

Elapsed?

V_BAT> V_LOWV

Yes

End Charge

Flash CHG

Start Fastcharge

_CHARGEset by ISET

I

No

t_FASTCHARGE

Elapsed?

I_BAT< I_TERM

Yes

End Charge

Flash CHG

Charge Done

CHG = Hi-Z

TD = Low

(’72, ’73 Only)

No

(’74, ’75 = YES)

Yes

Termination Reached

BATTFET Off

Wait for V_BAT< V_RCH

No

V_BAT< V_RCH

Yes

Run Battery Detection

No

Battery Detected?

Yes

Figure 40. Battery Charging Flow Diagram

Submit Documentation Feedback

23

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

ADJUSTABLE TERMINATION THRESHOLD (ITERM Input, bq24074)

The termination current threshold in the bq24074 is user-programmable. Set the termination current by

connecting a resistor from ITERM to VSS. For USB100 mode (EN1 = EN2 = Low), the termination current value

is calculated as:

I_TERM= 0.01 × R_ITERM/ R_ISET

In the other input current limit modes (EN1 ≠ EN2), the termination current value is calculated as:

I_TERM= 0.03 × R_ITERM/ R_ISET

The termination current is programmable up to 50% of the fastcharge current. The R_ITERMresistor must be less

than 15 kΩ. Leave ITERM unconnected to select the default internally set termination current.

TERMINATION DISABLE (TD Input, bq24072, bq24073)

The bq24072 and bq24073 contain a TD input that allows termination to be enabled/ disabled. Connect TD to a

logic high to disable charge termination. When termination is disabled, the device goes through the pre-charge,

fast-charge and CV phases, then remains in the CV phase. During the CV phase, the charger maintains the

output voltage at BAT equal to V_BAT(REG), and charging current does not terminate. The charge current is set by

I_CHGor I_INmax, whichever is less. Battery detection is not performed. The CHG output is high impedance once

the current falls below I_TERMand does not go low until the input power or CE are toggled. When termination is

disabled, the pre-charge and fast-charge safety timers are also disabled. Battery pack temperature sensing (TS

pin functionality) is disabled if the TD pin is high and the TS pin is unconnected or pulled up to V_IN.

BATTERY DETECTION AND RECHARGE

The bq2407x automatically detects if a battery is connected or removed. Once a charge cycle is complete, the

battery voltage is monitored. When the battery voltage falls below V_RCH, the battery detection routine is run.

During battery detection, current (I_BAT(DET)) is pulled from the battery for a duration t_DETto see if the voltage on

BAT falls below V_LOWV. If not, charging begins. If it does, then it indicates that the battery is missing or the

protector is open. Next, the precharge current is applied for t_DETto close the protector if possible. If V_BAT< V_RCH

,

then the protector closed and charging is initiated. If V_BAT> V_RCH, then the battery is determined to be missing

and the detection routine continues.

BATTERY DISCONNECT (SYSOFF Input, bq24075, bq24079)

The bq24075 and bq24079 feature a SYSOFF input that allows the user to turn the FET Q2 off and disconnect

the battery from the OUT pin. This is useful for disconnecting the system load from the battery, factory

programming where the battery is not installed or for host side impedance track fuel gauging, such as bq27500,

where the battery open circuit voltage level must be detected before the battery charges or discharges. The

/CHG output remains low when SYSOFF is high. Connect SYSOFF to VSS, to turn Q2 on for normal operation.

SYSOFF is internally pulled to VBAT through ~5 MΩ resistor.

DYNAMIC CHARGE TIMERS (TMR Input)

The bq2407x devices contain internal safety timers for the pre-charge and fast-charge phases to prevent

potential damage to the battery and the system. The timers begin at the start of the respective charge cycles.

The timer values are programmed by connecting a resistor from TMR to VSS. The resistor value is calculated

using the following equation:

t_PRECHG= K_TMR× R_TMR

t_MAXCHG= 10 × K_TMR× R_TMR

Leave TMR unconnected to select the internal default timers. Disable the timers by connecting TMR to VSS.

Note that timers are suspended when the device is in thermal shutdown, and the timers are slowed proportionally

to the charge current when the device enters thermal regulation. For the bq24072 and bq24073, the timers are

disabled when TD is connected to a high logic level.

During the fast charge phase, several events increase the timer durations.

1. The system load current activates the DPPM loop which reduces the available charging current

2. The input current is reduced because the input voltage has fallen to V_IN(LOW)

3. The device has entered thermal regulation because the IC junction temperature has exceeded T_J(REG)

24

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

During each of these events, the internal timers are slowed down proportionately to the reduction in charging

current. For example, if the charging current is reduced by half for two minutes, the timer clock is reduced to half

the frequency and the counter counts half as fast resulting in only one minute of "counting" time.

If the pre charge timer expires before the battery voltage reaches V_LOWV, the bq2407x indicates a fault condition.

Additionally, if the battery current does not fall to I_TERMbefore the fast charge timer expires, a fault is indicated.

The CHG output flashes at approximately 2 Hz to indicate a fault condition. The fault condition is cleared by

toggling CE or the input power, entering/ exiting USB suspend mode, or an OVP event.

STATUS INDICATORS (PGOOD, CHG)

The bq2407x contains two open-drain outputs that signal its status. The PGOOD output signals when a valid

input source is connected. PGOOD is low when (V_BAT+ V_IN(DT)) < V_IN< V_OVP. When the input voltage is outside

of this range, PGOOD is high impedance.

The charge cycle after power-up, CE going low, or exiting OVP is indicated with the CHG pin on (low - LED on),

whereas all refresh (subsequent) charges will result in the CHG pin off (open - LED off). In addition, the CHG

signals timer faults by flashing at approximately 2 Hz.

PGOOD STATUS INDICATOR

Input State

V_IN< V_UVLO

PGOOD Output

Hi impedance

Low

V_UVLO< V_IN< V_IN(DT)

V_IN(DT)< V_IN< V_OVP

V_IN> V_OVP

Hi impedance

CHG STATUS INDICATOR

Charge State

Charging

CHG Output

Low (for first charge cycle)

Flashing at 2Hz

Charging suspended by thermal loop

Safety timers expired

Charging done

Recharging after termination

IC disabled or no valid input power

Battery absent

Hi impedance

THERMAL REGULATION AND THERMAL SHUTDOWN

The bq2407x contain a thermal regulation loop that monitors the die temperature. If the temperature exceeds

T_J(REG), the device automatically reduces the charging current to prevent the die temperature from increasing

further. In some cases, the die temperature continues to rise despite the operation of the thermal loop,

particularly under high VIN and heavy OUT system load conditions. Under these conditions, if the die

temperature increases to T_J(OFF), the input FET Q1 is turned OFF. FET Q2 is turned ON to ensure that the

battery still powers the load on OUT. Once the device die temperature cools by T_J(OFF-HYS), the input FET Q1 is

turned on and the device returns to thermal regulation. Continuous overtemperature conditions result in a

"hiccup" mode. During thermal regulation, the safety timers are slowed down proportionately to the reduction in

current limit.

Note that this feature monitors the die temperature of the bq2407x. This is not synonymous with ambient

temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery

charging algorithm and the LDO associated with OUT. A modified charge cycle with the thermal loop active is

shown in Figure 41. Battery termination is disabled during thermal regulation.

Submit Documentation Feedback

25

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

PRECHARGE

THERMAL

CC FAST

CHARGE

CV TAPER

DONE

REGULATION

V

I

O(REG)

O(CHG)

Battery Voltage

Battery Current

V

(LOWV)

HI-z

I

(PRECHG)

I

(TERM)

T

J(REG)

IC Junction Temperature, T

J

Figure 41. Charge Cycle Modified by Thermal Loop

26

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

BATTERY PACK TEMPERATURE MONITORING

The bq2407x features an external battery pack temperature monitoring input. The TS input connects to the NTC

thermistor in the battery pack to monitor battery temperature and prevent dangerous over-temperature

conditions. During charging, I_NTCis sourced to TS and the voltage at TS is continuously monitored. If, at any

time, the voltage at TS is outside of the operating range (V_COLDto V_HOT), charging is suspended. The timers

maintain their values but suspend counting. When the voltage measured at TS returns to within the operation

window, charging is resumed and the timers continue counting. When charging is suspended due to a battery

pack temperature fault, the CHG pin remains low and continues to indicate charging.

For the bq24072 and bq24073, battery pack temperature sensing is disabled when termination is disabled (TD =

High) and the voltage at TS is greater than V_DIS(TS). For applications that do not require the TS monitoring

function, connect a 10kΩ resistor from TS to VSS to set the TS voltage at a valid level and maintain charging.

The allowed temperature range for 103AT-2 type thermistor is 0°C to 50°C. However, the user may increase the

range by adding two external resistors. See Figure 42 for the circuit details. The values for RT1 and RT2 are

calculated using the following equations:

-1500μA ´(RHOT + RCOLD) ± 20 ´ 5625μA²´ (RCOLD-RHOT)²+ 105μW ´(RCOLD -RHOT)

RT1 =

3000μA

(2)

1 V ´ (R1 + RHOT)

RT2 =

250 μA ´ RT1 + 250 μA ´ RHOT - 1 V

(3)

RHOT and RCOLD are the thermistor resistance at the desired hot and cold temperatures, respectively. Note

that the temperature window cannot be tightened more than using only the thermistor connected to TS, it

can only be extended.

I_NTC

bq2407x

RT1

PACK+

TS

TEMP

+

V_COLD

RT2

PACK-

+

V_HOT

Figure 42. Extended TS Pin Thresholds

Submit Documentation Feedback

27

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

APPLICATIONS INFORMATION

bq2407x CHARGER DESIGN EXAMPLE

See Figure 26 to Figure 28 for Schematics of the Design Example.

Requirements

•

Supply voltage = 5V

Fast charge current of approximately 800 mA; ISET - pin 16

Input Current Limit =1.3A; ILIM - pin 12

Termination Current Threshold = 110mA; ITERM – pin 15 (bq24074 only)

Safety timer duration, Fast-Charge = 6.25 hours; TMR – pin 14

TS – Battery Temperature Sense = 10kΩ NTC (103AT-2)

Calculations

Program the Fast Charge Current (ISET):

R_ISET= K_ISET/ I_CHG

K_ISET= 890 AΩ from the electrical characteristics table.

R_ISET= 890AΩ/0.8A = 1.1125 kΩ

Select the closest standard value, which for this case is 1.13kΩ. Connect this resistor between ISET (pin 16) and

V_SS

.

Program the Input Current Limit (ILIM)

R_ILIM= K_ILIM/ I_{I_MAX}

K_ILIM= 1550 AΩ from the electrical characteristics table.

R_ISET= 1550AΩ / 1.3A = 1.192 kΩ

Select the closest standard value, which for this case is 1.18 kΩ. Connect this resistor between ILIM (pin 12) and

V_SS

.

Program the Termination Current Threshold (I_TERM) (bq24074 only)

R_ITERM= I_TERM× R_ISET/ 0.030

R_ISET= 1.13 kΩ from the above calculation.

R_ITERM= 110mA × 1.13 kΩ / 0.030 = 4.143 kΩ

Select the closest standard value, which for this case is 4.12kΩ. Connect this resistor between ITERM (pin 15)

and V_SS. Note that when in USB100 mode (EN1 = EN2 = V_SS), the termination threshold is 1/3 of the normal

threshold.

Program 6.25-hour Fast-Charge Safety Timer (TMR)

R_TMR= t_MAXCHG/ (10 × K_TMR

)

K_TMR= 48 s/kΩ from the electrical characteristics table.

R_TMR= (6.25 hr × 3600 s/hr) / (10 × 45 s/kΩ) = 46.8kΩ

Select the closest standard value, which for this case is 46.4 kΩ. Connect this resistor between TMR (pin 2) and

V_SS

.

TS Function

Use a 10kΩ NTC thermistor in the battery pack (103AT-2). For applications that do not require the TS monitoring

function, connect a 10kΩ resistor from TS to VSS to set the TS voltage at a valid level and maintain charging.

28

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

CHG and PGOOD

LED Status: connect a 1.5kΩ resistor in series with a LED between OUT and CHG to indicate charging status.

Connect a 1.5kΩ resistor in series with a LED between OUT and PGOOD to indicate when a valid input source is

connected.

Processor Monitoring Status: connect a pullup resistor (on the order of 100 kΩ) between the processor’s power

rail and CHG and PGOOD

Termination Disable (TD) (bq24072, bq24073 only)

Connect TD high to disable termination. Connect TD low to enable termination.

System ON/OFF (SYSOFF) (bq24075 or bq24079 only)

Connect SYSOFF high to disconnect the battery from the system load. Connect SYSOFF low for normal

operation

SELECTING IN, OUT AND BAT pin CAPACITORS

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin,

input, output and battery pins. Using the values shown on the application diagram, is recommended. After

evaluation of these voltage signals with real system operational conditions, one can determine if capacitance

values can be adjusted toward the minimum recommended values (DC load application) or higher values for fast

high amplitude pulsed load applications. Note if designed high input voltage sources (bad adaptors or wrong

adaptors), the capacitor needs to be rated appropriately. Ceramic capacitors are tested to 2x their rated values

so a 16V capacitor may be adequate for a 30V transient (verify tested rating with capacitor manufacturer).

THERMAL PACKAGE

The bq24072/3/4/5 family is packaged in a thermally enhanced MLP package. The package includes a thermal

pad to provide an effective thermal contact between the IC and the printed circuit board (PCB). The power pad

should be directly connected to the V_SSpin. Full PCB design guidelines for this package are provided in the

application note entitled: QFN/SON PCB Attachment Application Note (SLUA271). The most common measure

of package thermal performance is thermal impedance (θ_JA) measured (or modeled) from the chip junction to the

air surrounding the package surface (ambient). The mathematical expression for θ_JAis:

θ_JA= (T_J- T) / P

Where:

T_J= chip junction temperature

T = ambient temperature

P = device power dissipation

Factors that can influence the measurement and calculation of θ_JAinclude:

1. Whether or not the device is board mounted

2. Trace size, composition, thickness, and geometry

3. Orientation of the device (horizontal or vertical)

4. Volume of the ambient air surrounding the device under test and airflow

5. Whether other surfaces are in close proximity to the device being tested

Due to the charge profile of Li-Ion batteries the maximum power dissipation is typically seen at the beginning of

the charge cycle when the battery voltage is at its lowest. Typically after fast charge begins the pack voltage

increases to ≈3.4V within the first 2 minutes. The thermal time constant of the assembly typically takes a few

minutes to heat up so when doing maximum power dissipation calculations, 3.4V is a good minimum voltage to

use. This is verified, with the system and a fully discharged battery, by plotting temperature on the bottom of the

PCB under the IC (pad should have multiple vias), the charge current and the battery voltage as a function of

time. The fast charge current will start to taper off if the part goes into thermal regulation.

Submit Documentation Feedback

29

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009................................................................................................................................................. www.ti.com

The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal

PowerFET. It can be calculated from the following equation when a battery pack is being charged :

P = [V_(IN)– V_(OUT)] × I_(OUT)+ [V_(OUT)– V_(BAT)] × I_(BAT)

The thermal loop feature reduces the charge current to limit excessive IC junction temperature. It is

recommended that the design not run in thermal regulation for typical operating conditions (nominal input voltage

and nominal ambient temperatures) and use the feature for non typical situations such as hot environments or

higher than normal input source voltage. With that said, the IC will still perform as described, if the thermal loop

is always active.

Half-Wave Adaptors

Some adapters implement a half rectifier topology, which causes the adapter output voltage to fall below the

battery voltage during part of the cycle. To enable operation with adapters under those conditions, the bq2407x

family keeps the charger on for at least 20 msec (typical) after the input power puts the part in sleep mode. This

feature enables use of external adapters using 50 Hz networks. The input must not drop below the UVLO voltage

for the charger to work properly. Thus, the battery voltage should be above the UVLO to help prevent the input

from dropping out. Additional input capacitance may be needed.

Sleep Mode

When the input is between UVLO and V_IN(DT), the device enters sleep mode. After entering sleep mode for

>20mS the internal FET connection between the IN and OUT pin is disabled and pulling the input to ground will

not discharge the battery, other than the leakage on the BAT pin. If one has a full 1000mAHr battery and the

leakage is 10µA, then it would take 1000mAHr/10µA = 100000 hours (11.4 years) to discharge the battery. The

battery’s self discharge is typically 5 times higher than this.

Layout Tips

•

To obtain optimal performance, the decoupling capacitor from IN to GND (thermal pad) and the output filter

capacitors from OUT to GND (thermal pad) should be placed as close as possible to the bq2407x, with short

trace runs to both IN, OUT and GND (thermal pad).

•

All low-current GND connections should be kept separate from the high-current charge or discharge paths

from the battery. Use a single-point ground technique incorporating both the small signal ground path and the

power ground path.

•

The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the maximum

charge current in order to avoid voltage drops in these traces

The bq2407x family is packaged in a thermally enhanced MLP package. The package includes a thermal pad

to provide an effective thermal contact between the IC and the printed circuit board (PCB); this thermal pad is

also the main ground connection for the device. Connect the thermal pad to the PCB ground connection. Full

PCB design guidelines for this package are provided in the application note entitled: QFN/SON PCB

Attachment Application Note (SLUA271).

30

Submit Documentation Feedback

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

bq24072, bq24073

bq24074, bq24075, bq24079

www.ti.com................................................................................................................................................. SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009

Revision History

Changes from Original (September 2008) to Revision A ............................................................................................... Page

•

Changed device Features...................................................................................................................................................... 1

Changed Description. ............................................................................................................................................................ 1

Changed Typical Application Circuit ...................................................................................................................................... 1

Changed description of CHG pin........................................................................................................................................... 6

Changed SYSOFF Description.............................................................................................................................................. 7

Changed the Simplified Block Diagram ................................................................................................................................. 8

Added Figure 4 through Figure 11......................................................................................................................................... 9

Changed APPLICATION CIRCUITS section. ...................................................................................................................... 12

Added Using bq24075 to Disconnect the Battery from the System, Figure 28. .................................................................. 13

Changed DETAILED FUNCTIONAL DESCRIPTION section.............................................................................................. 16

Changed text in section - STATUS INDICATORS (PGOOD, CHG).................................................................................... 25

Changed Table - CHG STATUS INDICATOR..................................................................................................................... 25

Changed Equation 2 and Equation 3................................................................................................................................... 27

Changed section - Half-Wave Adaptors .............................................................................................................................. 30

Changes from Revision A (December 2008) to Revision B ........................................................................................... Page

Changed V_BAT(REG)max value From 4.24 V To: 4.23 V ......................................................................................................... 5

•

Changes from Revision B (January 2009) to Revision C ............................................................................................... Page

Changed Maximum input current factor values. ................................................................................................................... 4

•

Changes from Revision C (March 2009) to Revision D .................................................................................................. Page

Added Device number bq24079. ........................................................................................................................................... 1

•

Submit Documentation Feedback

31

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075, bq24079

PACKAGE OPTION ADDENDUM

www.ti.com

2-Jul-2009

PACKAGING INFORMATION

Orderable Device

BQ24072RGTR

BQ24072RGTRG4

BQ24072RGTT

BQ24072RGTTG4

BQ24073RGTR

BQ24073RGTRG4

BQ24073RGTT

BQ24073RGTTG4

BQ24074RGTR

BQ24074RGTRG4

BQ24074RGTT

BQ24074RGTTG4

BQ24075RGTR

BQ24075RGTRG4

BQ24075RGTT

BQ24075RGTTG4

BQ24079RGTR

BQ24079RGTT

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

QFN

RGT

16

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

QFN

RGT

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

2-Jul-2009

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

1-Jul-2009

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

A0 (mm)

B0 (mm)

K0 (mm)

P1

W

Pin1

Diameter Width

(mm) W1 (mm)

(mm) (mm) Quadrant

BQ24072RGTR

BQ24072RGTT

BQ24073RGTR

BQ24073RGTT

BQ24074RGTR

BQ24074RGTT

BQ24075RGTR

BQ24075RGTT

BQ24079RGTR

BQ24079RGTT

QFN

RGT

16

3000

250

330.0

180.0

330.0

180.0

330.0

180.0

330.0

180.0

330.0

180.0

12.4

3.3

1.1

8.0

12.0

Q2

3000

250

3000

250

3000

250

3000

250

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

1-Jul-2009

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

BQ24072RGTR

BQ24072RGTT

BQ24073RGTR

BQ24073RGTT

BQ24074RGTR

BQ24074RGTT

BQ24075RGTR

BQ24075RGTT

BQ24079RGTR

BQ24079RGTT

QFN

RGT

16

3000

250

346.0

190.5

346.0

190.5

346.0

190.5

346.0

190.5

346.0

190.5

346.0

212.7

346.0

212.7

346.0

212.7

346.0

212.7

346.0

212.7

29.0

31.8

29.0

31.8

29.0

31.8

29.0

31.8

29.0

31.8

3000

250

3000

250

3000

250

3000

250

Pack Materials-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,

and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should

obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are

sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard

warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where

mandated by government requirements, testing of all parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and

applications using TI components. To minimize the risks associated with customer products and applications, customers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,

or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information

published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a

warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual

property of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied

by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive

business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional

restrictions.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all

express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not

responsible or liable for any such statements.

TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably

be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing

such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products

and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be

provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in

such safety-critical applications.

TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are

specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military

specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at

the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.

TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are

designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated

products in automotive applications, TI will not be responsible for any failure to meet such requirements.

Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products

Amplifiers

Applications

Audio

Automotive

Broadband

Digital Control

Medical

Military

Optical Networking

Security

amplifier.ti.com

dataconverter.ti.com

www.dlp.com

www.ti.com/audio

Data Converters

DLP® Products

DSP

Clocks and Timers

Interface

www.ti.com/automotive

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/medical

www.ti.com/military

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

dsp.ti.com

www.ti.com/clocks

interface.ti.com

logic.ti.com

power.ti.com

microcontroller.ti.com

www.ti-rfid.com

Logic

Power Mgmt

Microcontrollers

RFID

Telephony

Video & Imaging

Wireless

RF/IF and ZigBee® Solutions www.ti.com/lprf

www.ti.com/wireless

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

型号:	BQ24072RGTTG4
Brand Name：	Texas Instruments
是否Rohs认证：	符合
生命周期：	Obsolete
IHS 制造商：	TEXAS INSTRUMENTS INC
零件包装代码：	QFN
包装说明：	QFN-16
针数：	16
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	5.18
Is Samacsys：	N
可调阈值：	YES
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：	S-PQCC-N16
JESD-609代码：	e4
长度：	3 mm
湿度敏感等级：	2
信道数量：	1
功能数量：	1
端子数量：	16
最高工作温度：	85 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	HVQCCN
封装等效代码：	LCC16,.12SQ,20
封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	260
电源：	4.5/6.3 V
认证状态：	Not Qualified
座面最大高度：	1 mm
子类别：	Power Management Circuits
最大供电电流 (Isup)：	1.5 mA
最大供电电压 (Vsup)：	26 V
最小供电电压 (Vsup)：	4.35 V
标称供电电压 (Vsup)：	5 V
表面贴装：	YES
温度等级：	INDUSTRIAL
端子面层：	Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：	NO LEAD
端子节距：	0.5 mm
端子位置：	QUAD
阈值电压标称：	6.6
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3 mm
Base Number Matches：	1

电子百科

产品导航

产品型号BQ24072RGTTG4的Datasheet PDF文件预览

BQ24072RGTTG4相关产品

BQ24072RGTTG4相关文章

IC37:专业IC行业平台