BD9355MWV应用文章市场行情现货热卖使用介绍供应商报价-中国IC网-芯三七

Regulators ICs for Digital Cameras and Camcorders

System Switching Regulator IC

with Built-in FET (5V)

BD9355MWV

No.11036EAT15

●Description

7 Channel Switching Regulator Controller for Digital Camera that contains an internal FET.

Built in the function that dim a white LED for back light with a diming set signal from a microcomputer.

●Features

1) 1.5V minimum input operating

2) Supplies power for the internal circuit by step-up converter(CH1).

3) CH1step-up converter, CH2 cross converter, CH3,4 step-down converter,

CH5 inverting converter for CCD, CH6 boost converter for CCD, CH7 boost converter for LED

4) All channels contain internal Power MOSFET and compensation.

Built-In Over Voltage Protection (OVP) for CH1,2,7

5) Operating frequency 2.0MHz(CH3,4), 1MHz(CH1,2,5～7)

6) Contains sequence control circuit for CH1～4. It is possible to select sequence CH1⇒CH3⇒CH4⇒CH2 and

CH1⇒CH4⇒CH3⇒CH2 by SEQ_CTL pin

7) Built-In discharge switch (CH2,3,4) and contains off sequence control circuit for CH1～4.

CH1,3 turn off after CH2,4 output voltage discharged.

8) Built-In Short-circuit Protection (SCP)

9) CH1 have backgate control circuit CH6 have high side switches with soft start function.

10) Thermally enhanced UQFN036V5050 package(5mm□0.4mm pitch)

●Applications

For Digital Camera

●Absolute maximum ratings (Ta=25℃)

Parameter

Symbol

Ratings

Unit

V

Maximum applied power

Supply voltage

HX2BAT,VCCOUT

-0.3～7

VHx1～4, 56

( Hx56 - Lx5) Voltage

VLx6

-0.3～7

-0.3～15

-0.3～22

-0.3～30

±2.2

V

A

W

Maximum applied

input voltage

VLx7

IomaxHx1, Lx1

IomaxHx2

IomaxHx3

IomaxHx4

IomaxHx56

IomaxHS6L

IomaxLx7,8

Pd

±1.5

±1.2

Maximum Output current

±1.0

±1.5

+1.2

±1.0

Power Dissipation

0.88 (*1)

Operating Temperature

Storage Temperature

Topr

Tstg

-25～+85

℃

-55～+150

Maximum applied power

Supply voltage

HX2BAT,VCCOUT

+150

℃

*1 Should be derated by 7.04mW/℃ at Ta=25℃ or more. When mounted on a glass epoxy PCB of 74.2mm×74.2 mm×1.6 mm

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2011.03 - Rev.A

1/22

Technical Note

BD9355MWV

●Operating condition

Ratings

Parameter

Symbol

VBAT

Unit

Conditions

Min.

1.5

Typ.

Max.

5.5

Power supply voltage

-

0.1

-

V

VREF terminal connection capacity CVREF 0.047

0.47

100

µF

PWM7 input frequency range

fpwm

20

kHz

【Driver】

CH1 NMOS/PMOS drain current

Idpl1

－

2.1

A

CH2 Hx2BAT input current

Iin2

Idpl3

Idpl4

Idpl5

Idpl6

Idnl6,7

－

1.4

1.0

0.5

1.4

1.1

0.9

A

CH3 PMOS drain current

CH4 PMOS drain current

CH5 PMOS drain current

CH6 HS6L input current

CH6,7 NMOS drain current

【Output voltage setting range】

CH1

CH2

CH3

CH4

CH5

CH6

CH7

4.5

(※)

1.0

-9.5

5.5

－

5.4

4.4

-1.5

16

V

※Use with the following range.

※Use with VBAT<Vo6

※Use with VBAT<Vo7

26

●CH2 output voltage setting range

maximum input voltage - CH2 output voltage setting range

6.0

5.0

4.0

3.0

2.0

1.0

0.0

5.4V

Output voltage setting range

3.0V

1.75V

minimum setting value = (maximum input voltage + 0.5V)×0.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

maximum input voltage [V]

Fig.1 CH2 output voltage setting range

Ripple voltage level of CH2 cross converter would be big by cross talk with embedded oscillator when oscillating Duty of

step down side is 50 %. Therefore please not to set oscillating duty of CH2 with 50%.

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2011.03 - Rev.A

2/22

Technical Note

BD9355MWV

●Protective functions

Parameter

SCP

○

OCP

○

OVP

○

Conditions

Stop when shorted output

OVP: VCCOUTmonitor

CH1 step-up synchronous rectification

CH2 step-up voltage.

SCP:INV monitor

○

×

CH3 step-down synchronous

rectification

○

×

CH4 step-up synchronous rectification

CH5 inverse Di rectification

CH6 step-up Di rectification

CH7 step-up back light

○

×

SCP: Error amp output

(internal node) monitor

○

×

SCP: Error amp output

(internal node) monitor

○

×

OVP:VO7 monitor

×

○

●Over current protective part

Limits

Typ.

－

Parameter

Symbol

Unit

Conditions

Min.

Max.

CH1 LX1 OCP detecting current

CH2 HX2BAT OCP detecting current

CH3 HX3 OCP detecting current

CH4 HX4 OCP detecting current

CH5 LX5 OCP detecting current

CH6 HS6L OCP detecting current

CH6 LX6 OCP detecting current

CH7 Lx7 OCP detecting current

IOCP1

IOCP2

IOCP3

IOCP4

IOCP5

IOCP6H

IOCP6L

IOCP7

2.5

2.0

1.2

1.8

1.5

1.2

－

A

－

●Recommended maximum load current

Vo

(V)

Vin Io_max

Vo

(V)

Vin Io_max

condition

(V)

(mA)

(V)

(mA)

1.8

400

2.5

100

L=4.7µH

(TOKO:DE2815)

C=10µF

R1=156kΩ,

R2=30kΩ

L=4.3µH

(TOKO:DE4518C)

C=22µF

R1=390ｋΩ,

R2=75kΩ

2.5

3.6

4.2

1.8

2.5

3.6

4.2

1.8

2.5

3.6

4.2

2.5

3.0

3.6

4.2

750

850

300

600

800

1000

500

3.6

4.2

5.0

2.5

3.0

4.2

5.0

1.8

2.5

3.6

4.2

2.5

3.6

4.2

5.0

100

30

CH1 Boost

5.0

3.2

1.2

1.8

CH5 Reversal -6.5

Cc=1000pF

L=4.7µH

(TOKO:DE2815)

C=10µF

R1=440ｋΩ,

R2=200kΩ

Cc=12pF

L=4.7µH

(TOKO:DE2815)

C=10µF

R1=360kΩ,

R2=30kΩ

Boost/

CH2 Step-

down

40

50

25

CH6 Boost

13

L=4.7µH

(TOKO:DE2815)

C=10µF

R1=300ｋΩ,

R2=600kΩ

Boost

(worth

CH7 3 light 11.4

L=4.7µH

(TOKO:DE2815)

C=4.7µF

40

30

Step

CH3

down

LED)

L=4.7µH

(TOKO:DE2815)

C=10µF

R1=300ｋΩ,

R2=240kΩ

Boost

(worth

4 light

LED)

L=4.7µH

(TOKO:DE2815)

C=4.7µF

40

Step

CH4

CH7

14

down

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2011.03 - Rev.A

3/22

Technical Note

BD9355MWV

●Electrical characteristics (Unless specified, Ta=25℃, VCCOUT=5.0V, VBAT=3V, STB13～7=3V,UPIC8=2.5V)

Limits

Parameter

Symbol

Unit

Conditions

Min.

Typ.

Max.

【Low-voltage input malfunction prevention circuit】

Detecting voltage

Release voltage

Vstd1

Vstd2

⊿Vstd

-

2.3

2.5

2.4

2.7

300

V

VCCOUT monitor

2.3

100

VCCOUT monitor

Hysteresis width

200

mV

【Short Circuit Protection】

SCP detect time

Tscp

20

25

30

ms

V

Timer start threshold voltage

【Start-up Circuit】

Frequency

Vtcinv

0.38

0.48

0.58

INV monitor CH2～4

Fstart

Vst1

150

1.5

1.8

300

-

600

-

kHz

V

HX2BAT=1.8V

Start-up HX2BAT Voltage

Start-up CH Soft Start Time

【Oscillating circuit】

Frequency CH3,4

Tss1

3.0

5.3

msec

fosc1

fosc2

1.6

0.8

81

-

2.0

1.0

86

-

2.4

1.2

90

MHz

%

Frequency CH1,2,5-7

Max duty 1(step-up)

Max duty CH2 Lx21

Max dutyCH2 Lx22

Dmax1

Dmax21

Dmax22

Dmax34

Dmax567

100

90

%

81

-

86

-

%

Max duty 3, 4(step-down)

100

90

%

Max duty5,6,7

【Error Amp】

Input Bias current

81

86

%

IINV

-

0

50

0.81

1.01

630

473

257

45

nA

V

INV1～7, NON5=3.0V

CH1,3,4

INV threshold 1

INV threshold 2

INV7 threshold 1

INV7 threshold 2

INV7 threshold 3

INV7 threshold 4

VINV1

0.79

0.99

570

436

223

15

0.80

1.00

600

450

240

30

VINV2

V

CH2,6

VINV71

VINV72

VINV73

VINV74

mV

PWM7, Duty=100%

PWM7, Duty=75%

PWM7, Duty=40%

PWM7, Duty=5%

【For Inverting Base Bias Voltage Vref】

CH5 Output Voltage

VOUT5 -6.072 -6.000 -5.928

V

NON5, 15kΩ, 72kΩ

VCCOUT=2.8～5.5V

Vref=0V

Line Regulation

DVLi

Ios

-

4.0

1.0

12.5

-

mV

mA

Output Current When Shorted

0.2

【Soft Start 】

CH2,5,6 Soft Start Time

CH3,4 Soft Start Time

Tss2,5,6

Tss3,4

TDTC

3.1

1.2

5.0

5.3

2.1

8.2

7.4

3.0

msec

CH7 Duty Restriction time

11.8

(*)

Recommend resistor value over 20kΩ between VREF5 to NON5, because VREF5 current is under 100µA.

This product is not designed for normal operation with in a radioactive environment.

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2011.03 - Rev.A

4/22

Technical Note

BD9355MWV

●Electrical characteristics (Ta=25℃, VCCOUT=5.0V, HX,HX2BAT=3.6V, STB1～6=3V,PWM7=2.5V)

Limits

Parameter

【Output Driver】

Symbol

Unit

Conditions

Min.

Typ.

Max.

CH1 High side SW ON Resistance

CH1 Low side SW ON Resistance

CH2 Lx21 High side SW ON resistance

CH2 Lx21 Low side SW ON resistance

CH2 Lx22 High side SW ON resistance

CH2 Lx22 Low side SW ON resistance

CH3 High side SW ON Resistance

CH3 Low side SW ON Resistance

CH4 High side SW ON Resistance

CH4 Low side SW ON Resistance

CH5 PMOS SW ON resistance

RON1P

RON1N

RON21P

RON21N

RON22P

RON22N

RON3P

RON3N

RON4P

RON4N

RON5P

RON6,7N

RON6P

RLED

-

100

60

150

120

180

150

230

180

300

230

700

750

230

3.0

mΩ

Ω

Hx1=5V

VCCOUT=5.0V

Hx2BAT=3.6V

120

100

150

120

200

150

450

500

150

2.0

VCCOUT=5.0V

VOUT2=3.6V

VCCOUT=5.0V

Hx3=3.6V , VCCOUT=5V

VCCOUT=5.0V

Hx4=3.6V, VCCOUT=5V

VCCOUT=5.0V

Hx56=3.6V

CH6,7 NMOS SW ON resistance

CH6 Load SW ON resistance

VCCOUT=5.0V

Hx56=3.6V

LED PIN SW ON resistance

【Discharge switch】

-

VCCOUT=5.0V

CH2 discharge SW ON resistance

RDSW2

RDSW3

RDSW4

-

500

1000

Ω

VCCOUT=5.0V

CH3 discharge SW ON resistance

CH4 discharge SW ON resistance

【STB1～6】

Active

STB Control Voltage

Non Active

VSTBH1

VSTBL1

RSTB1

1.5

-0.3

250

-

5.5

0.3

V

Pull Down Resistance

【PWM7】

400

700

kΩ

PWM7 Threshold

VPWM7

RPWM7

Toff7

1.1

250

200

1.5

400

300

1.9

700

-

V

Pull Down Resistance

kΩ

CH7 Delay time for shutdown

【Circuit Current】

usec

VCCOUT terminal

ISTB1

ISTB2

ISTB3

-

5

μA

Stand-by Current

Hx terminal

Lx terminal

Step-down Cross- converter

Step-up

Circuit Current when start-up

(HX2BAT current when voltage supplied

for the terminal)

IST

-

150

5.0

450

9.7

μA

HX2BAT=1.5V

Circuit Current (VCCOUT current

when voltage supplied for the terminal)

INV1～7=1.2V ,

NON5=-0.2V

Icc2

mA

This product is not designed for normal operation with in a radioactive environment.

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2011.03 - Rev.A

5/22

Technical Note

BD9355MWV

●Reference data (1)

CH1,2,5,6,7 frequency temperature

characteristic

Start-up circui operating frequency

temperature characteristic.

CH3,4 frequency temperature characteristic

2.40

2.30

2.20

2.10

2.00

1.90

1.80

1.70

1.60

1.20

1.15

1.10

1.05

1.00

0.95

0.90

0.85

0.80

600

500

400

300

200

100

0

356.500

1.004

2.034

2.031

297.700

1.016

2.012

1.006

2.008

1.987

0.994

331.100

1.017

274.700

251.000

-25

0

25

50

75

100

-25

0

25

50

75

100

-25

0

25

50

75

100

Ta [℃]

Fig.2 Start-up circuit frequency－Temp

Fig.4 Frequency CH3,4－Temp

Fig.3 Frequency CH1,2,5～7－Temp

Ta-CH2,6 base voltage

1.0

Ta-CH5 base voltage

Ta-CH1,3,4 base voltage

1.0

0.5

0.0

-0.05

-0.06

-0.07

-0.09

-0.07

-0.10

0.0

-0.02

0.00

-0.05

-0.10

-0.14

-0.16

-0.19

-0.20

-0.21

-0.5

-1.0

-0.5

-1.0

-0.5

-1.0

-25

0

25

50

75

100

-25

0

25

50

75

100

-25

0

25

50

75

100

Ta [℃]

Fig.5-1 CH134 Base voltage－Temp

Fig.5-2 CH26 Base voltage－Temp

Fig.5-3 CH5

Base voltage－Temp

CH2 Cross converter 3.2V efficiency-Io

100

CH3 Step down 1.2V efficiency-Io

CH1 Step up 5.0V efficiency-Io

100

95

90

85

80

75

70

65

60

55

50

95

90

85

80

75

70

65

60

55

95

90

85

VBAT=4.2V

VBAT=3.6V

VBAT=3.0V

VBAT=2.5V

VBAT=1.8V

VBAT=4.2V

VBAT=3.6V

VBAT=3.0V

VBAT=2.5V

VBAT=1.8V

VBAT=4.2V

80

VBAT=3.6V

VBAT=3.0V

75

VBAT=2.5V

VBAT=1.8V

70

10

100

Io [mA]

1000

10

100

1000

10

100

Io [mA]

1000

Io [mA]

Fig.8 CH3

1.2V step-down efficiency-Io

Fig.6 CH1

5.0V voltage boost efficiency－Io

Fig.7 CH2 3.2

Voltage boost efficiency－Io

CH6 13V Step up efficiency-Io

CH4 Step down 1.8V efficiency-Io

CH5 Inverting -6.5V efficiency-Io

100

95

90

85

80

75

70

65

60

55

50

100

95

90

85

80

75

70

65

60

95

90

85

80

75

70

65

60

VBAT=5.0V

VBAT=4.2V

VBAT=3.6V

VBAT=2.5V

VBAT=4.2V

VBAT=3.6V

VBAT=3.0V

VBAT=2.5V

VBAT=4.2V

VBAT=3.6V

VBAT=3.0V

VBAT=2.5V

1

10

100

1

10

Io [mA]

100

10

100

Io [mA]

1000

Io [mA]

Fig.11 CH6 13V

Fig.9 CH4 1.8V

Fig.10 CH5 –6.5V

boost efficiency－Io

step-down efficiency-Io

inverting efficiency－Io

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2011.03 - Rev.A

6/22

Technical Note

BD9355MWV

●Reference data (2)

CH7 3LED efficiency-Vin

IVCCOUT-VBAT (application)

11

9

100

95

90

85

80

75

70

9.90

9.93

Io=12mA

Io=24mA

9.70

9.04

9.53

8.87

9.21

8.50

9.25

8.57

8.53

8.45

8.10

8.19

8.23

8.14

7

All_CH_ON

CH1～6_ON

CH1～5_ON

CH1～4_ON

5

1

2

3

4

5

6

2

2.5

3

3.5

VBAT [V]

4

4.5

VBAT [V]

Fig.13 IVCCOUT-VBAT

(Recommended application)

Fig.12 CH7 3LED Efficiency－Input voltage

STB1234

CH1 voltage boost 5V

CH2 cross converter 3.2V

STB1234

CH1 voltage boost 5V

CH3 step down 1.2V

CH4 step down 1.8V

Fig.14 CH1 start-up waveform

(VBAT=1.5V)

Fig.15 CH1 start-up waveform

(VBAT=3.6V)

Fig.16 CH2~CH4 start-up waveform

(SEQ CTL=L)

CH1 voltage boost 5V

CH2 cross converter 3.2V

STB5

STB6

CH6 voltage boost 13V

CH5 inverting -6.5V

CH3 step down 1.2V

CH4 step down 1.8V

Fig.17 CH2~CH4 start-up waveform

(SEQ_CTL=H)

Fig.18 CH5 start-up waveform

Fig.19 CH6 start-up waveform

CH1 voltage boost 5V

PWM7

CH7 4LED

LX7

PWM7

CH7 4LED

CH2 cross converter 3.2V

CH3 step down 1.2V

CH4 step down 1.8V

Fig.20 CH7 start-up waveform

Fig.21 CH1~4 waveform when OFF

(SEQ_CTL=H/L common)

Fig.22 CH7 waveform when OFF

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2011.03 - Rev.A

7/22

Technical Note

BD9355MWV

●Block Diagram

27 26 25 24

23

22 21

20 19

18

28

INV7

STB1234

HX3

17

16

15

14

13

12

29

30

31

32

33

34

LED

LX3

PWM7

PGND34

VO7

LX7

LX4

HX4

BD9355MWV

PGND567

LX6

HX1

LX1

11

10

35

36

STB6

HS6L

PGND1

1

2

3

4

5

6

7

9

8

Fig.23 BD9355MWV Top VIEW

●Pin description

Pin No

Pin name

I/O

Function

IC Power Supply Input

Ground terminal

note

Part of controller

24

VCCOUT

I

Power Supply for Low side Driver

23

GND

O

I

10,5,15,33

PGND1,2,34,567

VREF5

Ground for Internal FET

CH5 Reference Output

25

Step up output voltage terminal

(Contains backgate control)

12

Hx1

CH2-6 Pch FET Source Terminal ,

FET Driver Power Supply

17,7,13,1

HX3,2BAT,4,56

Lx1,3,4,5,6,7

Lx21

11,16,14,2,34,32

I/O Terminal for Connecting Inductor

Terminal for Connecting Inductor

For CH2 Input

6

I/O

Terminal for Connecting Inductor

For CH2 Output

4

Lx22

I/O

3

VOUT2

O

I

CH2 DC/DC Output

Output Terminal for Internal

Load Switch

36

HS6L

21,22,19,20,27,28 INV1,2,3,4,6,7

Error Amp Inverted Input

26

NON5

I

Error Amp Non-inverted input

ON/OFF switch

H: operating over 1.5V

18,8,35

30

STB1234,5,6

PWM7

I

CH7 ON/OFF Control,

PWM Dimming Input

I

GND:CH1→CH3→CH4→CH2

VCCOUT:CH1→CH3→CH4→CH2

9

SEQ_CTL

LED

I

Sequence control terminal

Terminal for connecting LED

Cathode

29

I

31

VO7

I

CH7 DC/DC Output

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2011.03 - Rev.A

8/22

Technical Note

BD9355MWV

●Application circuit(1)

Fig.24 Applied circuit diagram 1(lithium 1 cell)

○Operation notes

・we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristics when using it. In addition,

when using it with the external circuit’s constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external

components and ROHM’s IC in terms of not only static characteristic but also transient characteristic.

www.rohm.com

2011.03 - Rev.A

9/22

Technical Note

BD9355MWV

●Application circuit (2)

Fig.25 Applied circuit diagram 2(dry battery ×2)

○Operation notes

・we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristics when using it. In addition,

when using it with the external circuit’s constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external

components and ROHM’s IC in terms of not only static characteristic but also transient characteristic.

www.rohm.com

2011.03 - Rev.A

10/22

Technical Note

BD9355MWV

●Timing chart (1)

SEQ_CTL=L (GND)

STB1234

Vo1

Vo3

Tss3

Tss4

Vo4

Vo2

Tss2

SEQ_CTL=H (VCCOUT)

STB1234

Vo1

Vo4

Tss4

Tss3

Vo3

Vo2

Tss2

Fig.26 CH1～4 start-up sequence

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2011.03 - Rev.A

11/22

Technical Note

BD9355MWV

●Timing chart (2)

STB5, STB6

CH5

Revercing

output

Tss6

Tss5 typ5.3msec

Tss7

CH6

Output

Tss6 typ5.3msec

Fig.27 CH5,6 start-up sequence

Input pulse or high level

PWM7

Stand up by PWM7's rising edge

EN7

（CH7 internal start-up signal）

ERROR AMP output voltage is clamped during soft start

TDTC

DTC7(Internal node of IC）

Error amp output(Internal node of IC）

Output voltage correspond to duty of input pulse

Vo7

T^DTC：typ. 8.2msec

Fig.28 CH7 start-up sequence

www.rohm.com

2011.03 - Rev.A

12/22

Technical Note

BD9355MWV

●Timing chart (3)

STB1234

Vo2

(3V)

Discharge by 500ΩSW

15% of setting voltage

Discharge by 500ΩSW

15% of setting voltage

Vo4

(1.8V)

Discharge by 500ΩSW

Vo3

(1.0V)

15% of setting voltage

Vo1

(5.0V)

discharge by segmentation registance and Io

Fig.29 CH1～4 OFF sequence

STB5,6

Vo5

Vo6

discharge by segmentation

registance and Io

CH5, 6 OFF

Fig.30 CH5,6 OFF sequence

Input duty

PWM7

EN7

CH7 OFF When PWM=L continued on about 300μsec

TOFF (wait time for CH7 OFF)

DTC7

Vo7

CH7 OFF

Discharge by Io

TOFF：typ. 300usec

Fig.31 CH7 OFF sequence

13/22

www.rohm.com

2011.03 - Rev.A

Technical Note

BD9355MWV

●CH7 dimming function

VBAT

Vo7

Shut down

UVLO

LED

OSC

1MHz

LED

SS

slope

Lx7

Vo7

EN7

Error Amp

INV7

Curent mode

control

DRIVER

-

+

0.6Vmax

for SCP Comp

EN7

BandGap

Vo7

Buffer

Shut down

10kΩ

PWM7

OVP

Latch

Vo7=28Vtyp detect

I/O

+

-

Q

S

EN

control

Logic

R

20k～100kHz

Shut down

UVLO

Shut down

UVLO

Fig..32 CH7 block diagram

●CH7 operation

The output duty control signal for soft start starts rising by connecting terminals LED and INV7 when inputting any Duty for PWM7.

And threshold voltage of erroramp being proportional to PWM7 Duty is supplied by PWM7 input signal after start up , then

INV7 output voltage being proportional to PWM7 Duty is supplied as the result of negative feedback of DCDC converter.

DTC7 rises up slower comparatively with oscillating frequency by fixed degree incline. Oscillating duty is restricted by DTC7

signal which is inputted to PWM comparator therefore input rush current is prevented to occur even output voltage of

erroramp at start up time rises up rapidly. The time from start up to reaching set current of LED is depend on input voltage,

a number of LED , PWM7 duty , resistor to set the current of LED. The time to reach set current of LED will be long when

input voltage is low , a number of LED is big , set output current is big because of high duty under that condition. When you

input L voltage into PWM7 pin during over 500μsec typ, Switch between LED and INV7 and switching turn off. CH7 heve

Over voltage protection(OVP).When VO7 pin is over 28Vtyp,OVP stop CH7 function..OVP latch CH7 function and reset dy

All STB=L.

●Attention of CH7 start-up

In case CH7 start up, Please turn on STB1234 before CH7.CH7 can not start before CH1,2,3,4

www.rohm.com

2011.03 - Rev.A

14/22

Technical Note

BD9355MWV

●Recommended method of setting at the time of INV7 output voltage setting.

If INV7 output setting value is made larger than previous setting value during all intervals but soft start interval (at the time

of starting up), it is recommended that the value of voltage is increased step by step with the smallest possible width of step

after fully evaluating the restriction at the soft side that controls rush current and switching and the vision of brightness etc.

in terms of set application.

○PWM7 Duty INV7 Voltage Value

INV7 is output voltage that proportionate to PWM7 input PWM pulse DUTY and control LED current by external resister for

setting (between INV7 and GND ). LED current is decided by NOTE1 formula.

(Note 1) LED current

=

INV7 voltage

/

resistance R for LED current setting

PWM7 InputDUTY[%]

INV7 Output Voltage [mV]

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

30

60

90

120

150

180

210

240

270

300

330

360

390

420

450

480

510

540

570

600

Fig.33 PWM7 DUTY – INV7 Terminal Voltage

www.rohm.com

2011.03 - Rev.A

15/22

Technical Note

BD9355MWV

●Block explanation

1. SCP, Timer Latch

It is a timer latch type of short-circuit protection circuit.

For CH1,2, 6～8, the error AMP output voltage is monitored, and detected when the feedback voltage deviates from

control, for CH3～5, it is detected when the voltage of INV terminal becomes lower than 60%, and in 25ms the latch

circuit operates and the outputs of all the channels are fixed at OFF.

In order to reset the latch circuit, please turn off all the STB terminals before turning them on once again or turning power

supply on once again.

2. U.V.L.O

It is a circuit to prevent malfunction at low voltage.

It is to prevent malfunction of internal circuit at the time of rising or dropping to a lower value of power supply voltage.

If the voltage of VCCOUT terminal becomes lower than 2.3V, then the output of each DC/DC converter is reset to OFF,

and SCP’s timer latch & soft start circuit are reset. When control is deviated from, the operation of CH1 at the time of

start-up will be explained in START UP OSC mentioned later.

3. Voltage Reference (VREF5)

For the reference voltage circuit of CH5 inversion CH, the output voltage is 1.25V and outputted from VREF5 terminal (25pin).

According this voltage and the output voltage of CH5, the dividing resistance (resistor) is set and then the output voltage

is set.

If STB5 terminal is made to be H level at the time of start-up, then increase gradually the voltage up to 1.25V. The

inversion output of CH5 follows this voltage and performs the soft start. 0.1μF is recommended as the external capacitor.

4. OSC

It is an oscillation circuit the frequency of which is fixed by a built-in CR.

The operating frequencies of CH3, 4 are set at 2MHz, and the operating frequencies of CH1, 2, 5 are set at 1MHz.

5. ERRAMP 1～7

It is an error amplifier to detect output signal and output PWM control signal. The reference voltages of ERRAMP (Error

Amplifier) of CH1, 3, 4 are internally set at 0.8V, and the reference voltages of ERRAMP (Error Amplifier) of CH2,6 are set

at 1.0V. The reference voltage of CH5 is set at GND potential, and for CH7’s ERRAMP7, the maximum value of the

reference voltage is set at 0.6V. In addition, each CH incorporates a built-in element for phase compensation.

6. ERRCOMP, Start Up OSC

It is a comparator to detect the output voltage and control the start circuit, and also an oscillator that is turned ON/OFF by

this comparator and starts operating from 1.5V. The frequency of this oscillator is about 300 kHz fixed internally. This

oscillator stops operating if VCC terminal becomes more than 2.5V or the soft start time is exceeded.

7. Current mode control block

CH1, 3～7 adopt the PWM method based on current mode.

For a current- mode DC/DC converter, FET at the main side of synchronous rectification is turned on when detecting the

clock edge, and turned off by detecting the peak current by means of the current comparator.

8. Cross Control

DUTY controller for CH2 cross converter. It have PWM comparator that compare 1MHz SLOPE and ERROR AMP output

and logic circuit for control 4 FET ON/OFF switching.. LX21 MAX ON DUTY is 100%, LX21 MAX ON DUTY is 86%.

9. Back gate Control

PchFET backgate selector controller in CH1.

PchFET have body Di between backgate and source,drain ordinary. This circuit intercept CH1 step up output voltage by

cutting body Di line at STB OFF and control soft start .CH1 softstart output voltage from 0V like a slope.

10.Nch DRIVER, Pch DRIVER

Internal Nch, Pch FET driver CMOS inverter type output circuit.

11. Load SW

It is a circuit, mounted in CH6, to control the Load SW. Hx56 terminal (1pin) is input terminal, and the HS6L terminals

(36pin) are output terminals.

This control circuit can prevent the rush current at the time of SW ON because the soft start starts functioning at the time

of start-up. In addition, this Load SW is provided with OCP function to prevent the IC from damage.

Ensure that the IC is used within Load SW’s rated current when used normally.

www.rohm.com

2011.03 - Rev.A

16/22

Technical Note

BD9355MWV

12.ON/OFF LOGIC

It is the voltage applied to STB terminal and can control the ON/OFF of CH1～CH6.

If the voltage more than 1.5V is applied, then it becomes ON, but if open or 0V is applied, then it becomes off,

furthermore, it all the channels are turned off, then the whole IC will be in standby state. In addition, STB1, 2, 3, 4～STB6

terminals contain respectively a built-in pull-down resistor of about 400kΩ.

PWM7 is the input terminal of the start signal and the light control signal of CH7. It becomes high if the voltage more than

2.1V is applied and becomes Low if the voltage less than 0.4V is applied. In addition, PWM7 terminal contains a built-in

pull-down resistor of about 400kΩ.

13.SOFT START

It is a circuit to apply the soft start to the output voltage of DC/DC converter and prevent the rush current at the start-up.

Soft start time varies with the channels.

a. CH1・・・・reaches the target voltage in 3.0ms.

b. CH3,4・・・ reach the target voltage in 2.1ms.

c. CH2,5,6・・ reach the target voltage in 5.3ms.

d. CH7・・・・reach the target voltage in 8.2ms.

14.Brightness controller

CH7 have LED brightness controller.INV7 is output voltage that proportionate to PWM7 input DUTY and control LED

current by external resister for setting (between INV7 and GND ).

15.OVP COMP7

In CH7, When LED is OPEN, INV7 become L and output voltage increase suddenly. If this condition continues, Lx7

voltage increase and exceed break down voltage. CH7 heve Over voltage protection (OVP).When VO7 pin is inputted

over 28Vtyp, OVP stop CH7 function..OVP latch CH7 function and reset dy All STB=L

www.rohm.com

2011.03 - Rev.A

17/22

Technical Note

BD9355MWV

●Setting method of IC peripheral components

(1) Design of feedback resistor constant

VOUT7

VOUT1,3,4

VREF5

VOUT2,6

ERROR AMP

R1

INV

NON

INV

R2

ERROR AMP7

INV7

VREF

0.8V

VOUT5

VREF

1.0V

R3

Reference

connected to GND inside

IC

voltage

is

VREF

0.6V at DUTY100%

CH1,3,4output voltage

(R1+R2)

CH5 output voltage

R2

Vo=

×0.8 [V] ・・・ (1)

Vo= －

×1.25 [V] ・・・ (2)

R2

R1

CH2,6 output voltage

(R1+R2)

CH7 output voltage

INV7

Io=

[A] ・・・ (4)

Vo=

×1.0 [V] ・・・ (3)

R3

R2

Fig.34 Feedback resistor setting method

(a) CH1,3,4 setting

The reference voltage of CH1,3,4 ERROR AMP is 0.8V. Please refer to Formula (1) in Fig.33 for determining the

output voltage.

This IC incorporates built-in phase compensation. Please refer to Applied Circuit Diagram for setting the values of R1

& R2 and ensure that the setting values of R1 & R2 are of the order of several hundred kΩ.

(b) CH5 setting

The reference voltage of CH5’s ERROR AMP is connected to GND inside the IC. Therefore, a high-accuracy

regulator can be configured if setting by the feedback resistance between the outputs of VREF and CH5 as shown in

Fig.33. Please refer to Formula (2) in Fig.33 for determining the output voltage. R1 is recommended as more than

20kΩ because the current capacity of VREF5 is about 100μA.

(c) CH2,6 setting

The reference voltage of CH7’s ERROR AMP is 1.0V. Please refer to Formula (3) in Fig.33 for determining the output

voltage.

(d) CH7 setting

LED current is decided by Fig.33 (4) formula. Please decide R3 value for LED current range.

(2) Points for attention in terms of PCB layout of base-plate

○For a switching regulator, in principle a large current transiently flows through the route of power supply – coil –

output capacitor. Ensure that the wiring impedance is lowered as much as possible by making the pattern as wide as

possible and the layout as short as possible.

○Interference of power supply noise with feedback terminals (INV1～7,NON5) may cause the output voltage to

oscillate. Ensure that the power supply noise’s interference is avoided by making the wiring between feedback

resistor and feedback terminal as short as possible.

www.rohm.com

2011.03 - Rev.A

18/22

Technical Note

BD9355MWV

●PIN equivalent circuit

INV1～INV6

NON5

(Error amplifier’s non-inversion input)

(Error amplifier’s inversion input)

VCCOUT

NON5

INV

STB5,6

STB1234

(operating when CH5,6 ON/OFF switch is High)

(operating when CH1～4 ON/OFF switch is High)

VCCOUT

Hx2BAT

STB

STB1234

VREF5

PWM7

(CH5 Standard voltage output)

(CH7 start signal, LED modulated light signal input)

VCCOUT

PWM7

VREF5

www.rohm.com

2011.03 - Rev.A

19/22

Technical Note

BD9355MWV

Hx1,2BAT,3,4,VOUT2 (Pch FET source terminal)

Lx1,21,22,3,4(Nch,Pch FET drain terminal)

PGND1,2,34 (output stage earthing terminal)

HS6H (PMOS high side SW input terminal)

HS6L (OMOS high side SW input terminal)

Hx567

Hx,VOUT2

Lx

VCCOUT

HS6L

Lx5

PGND

Lx6,7 (Nch FET drain terminal)

PGND567

INV7(CH7 Error amplifier’s inversion input)

LED(LED cathode connection terminal)

LED

Lx6,7

VCCOUT

PGND567

INV7

Hx1,2BAT(Pch FET FET source terminal)

Lx1,21(Nch,Pch FET drain terminal)

PGND1,2 (output stage earthing terminal)

Hx1

Hx2BAT

Lx21

Lx1

PGND2

PGND1

Fig.35 PIN equivalent circuit

www.rohm.com

2011.03 - Rev.A

20/22

Technical Note

BD9355MWV

●Notes for use

1)Absolute Maximum Ratings

Although the quality of this product has been tightly controlled, deterioration or even destruction may occur if the absolute

maximum ratings, such as for applied pressure and operational temperature range, are exceeded. Furthermore, we are

unable to assume short or open mode destruction conditions. If special modes which exceed the absolute maximum

ratings are expected, physical safely precautions such as fuses should be considered.

2)GND Potential

The potential of the GND pin should be at the minimum potential during all operation status. In addition, please try to do

not become electric potential below GND for the terminal other than NON5 including the transient phenomenon in

practice. Please do not go down below 0.3V for the NON5 terminal with transient phenomenon and the like when you

use.

3)Heat Design

Heat design should consider tolerance dissipation (Pd) during actual use and margins which should be set with plenty of

room.

4)Short-circuiting Between Terminals and Incorrect Mounting

When attaching to the printed substrate, pay special attention to the direction and proper placement of the IC. If the IC

is attached incorrectly, it may be destroyed. Destruction can also occur when there is a short, which can be caused by

foreign objects entering between outputs or an output and the power GND.

5)Operation in Strong Magnetic Fields

Exercise caution when operating in strong magnet fields, as errors can occur.

6)About common impedance

Please do sufficient consideration for the wiring of power source and GND with the measures such as lowering common

impedance, making ripple as small as possible (making the wiring as thick and short as possible, dropping ripple from

L.C) and the like.

7)Heat Protection Circuit (TSD circuit)

This IC has a built-in Temperature Protection Circuit (TSD circuit). The temperature protection circuit (TSD circuit) is only

to cut off the IC from thermal runaway, and has not been designed to protect or guarantee the IC. Therefore, the user

should not plan to activate this circuit with continued operation in mind.

8)Rush current at the time of power supply injection.

Because there are times when rush current flows instantaneously in internal logical uncertain state at the time of power

source turning on with CMOS IC, please pay attention to the power source coupling capacity, the width of GND pattern

wiring and power source, and the reel.

9)IC Terminal Input

This IC is a monolithic IC, and between each element there is a P+ isolation and P substrate for element separation.

There is a P-N junction formed between this P-layer and each element’s N-layer, which makes up various parasitic

elements. For example, when resistance and transistor are connected with a terminal as in fig.35:

○When GND>(terminal A) at the resistance, or GND>(terminal B) at the transistor (NPN), the P-N junction operates

as a parasitic diode.

○Also, when GND>(terminal B) at the transistor, a parasitic NPN transistor operates by the N-layer of other

elements close to the aforementioned parasitic diode.

With the IC’s configuration, the production of parasitic elements by the relationships of the electrical potentials is

inevitable. The operation of the parasitic elements can also interfere with the circuit operation, leading to malfunction and

even destruction. Therefore, uses which cause the parasitic elements to operate, such as applying voltage to the input

terminal which is lower than the GND(P-substrate), should be avoided.

Transistor (NPN)

Resistance

B

(Terminal A)

(Terminal B)

E

C

(TerminalA)

GND

N

P

P⁺

P

P⁺

Parasitic

Element

N

P Board

GND

Parasitic

Element

GND

Parasitic Element

Fig.. 36 Simple Structure of Bipolar IC (Sample)

www.rohm.com

2011.03 - Rev.A

21/22

Technical Note

BD9355MWV

●Ordering part number

B D

9

3

5

M W V

-

E

2

Part No.

Package

MWV : UQFN036V5050

Packaging and forming specification

E2: Embossed tape and reel

UQFN036V5050

5.0 0.1

Tape

Embossed carrier tape

2500pcs

Quantity

E2

Direction

of feed

The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

1PIN MARK

(

)

S

0.08

C0.2

S

2.7 0.1

9

1

36

10

28

18

27

0.9

19

0.2

+0.05

Direction of feed

1pin

0.4

-

0.04

Reel

Order quantity needs to be multiple of the minimum quantity.

(Unit : mm)

∗

www.rohm.com

2011.03 - Rev.A

22/22

Daattaasshheeeett

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment ^{(Note 1)}, transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN

USA

EU

CHINA

CLASSⅢ

CLASSⅣ

CLASSⅡb

CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning

residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual

ambient temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the

ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice - GE

Rev.002

Daattaasshheeeett

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

QR code printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,

please consult with ROHM representative in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable

for infringement of any intellectual property rights or other damages arising from use of such information or data.:

2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the information contained in this document.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

Notice - GE

Rev.002

Daattaasshheeeett

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall not be in an y way responsible or liable for failure, malfunction or accident arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or

concerning such information.

Notice – WE

Rev.001

型号:	BD9355MWV-E2
是否Rohs认证：	符合
生命周期：	Active
包装说明：	HVQCCN,
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	1.74
模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION
最大输入电压：	5.5 V
最小输入电压：	1.5 V
标称输入电压：	3 V
JESD-30 代码：	S-XQCC-N36
长度：	5 mm
功能数量：	1
端子数量：	36
最高工作温度：	85 °C
最低工作温度：	-25 °C
最大输出电流：	2.2 A
封装主体材料：	UNSPECIFIED
封装代码：	HVQCCN
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
座面最大高度：	1 mm
表面贴装：	YES
切换器配置：	BOOST
温度等级：	OTHER
端子形式：	NO LEAD
端子节距：	0.4 mm
端子位置：	QUAD
处于峰值回流温度下的最长时间：	10
宽度：	5 mm
Base Number Matches：	1

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