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产品型号BCT1583的Datasheet PDF文件预览

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

GENERAL DESCRIPTION

The BCT1583S is a step down monolithic regulator with a built in internal power

MOSFET, capable of driving up to 3A continuous output current with excellent line and

load regulation. The output voltage can be set from 1.22 to 18V.

Requiring a minimum number of external components, it offers simple to use, but high

efficiency and advanced protection features including pulse-by-pulse current limiting and

thermal shutdown. Adjustable soft-start reduces the stress on the input source at turn-on

and the regulator draws only 20uA in shutdown mode.

BCT1583S is available in a Pb-Free SOIC8 with Exposed Pad package.

FEATURES

APPLICATIONS

• Wide Vin Range: 4.5 to 20V

• 3A Output Current

•

Simple High Efficiency Step-down

Consumer: TV, STB, DVD, VCR

Car Audio/TV/Navigation

Battery Charger

Pre-Regulator for Linear

Regulators

• High Efficiency up to 95%

• Output Adjustable from 1.22 to 18V

• 385KHz Fixed Frequency internal oscillator

• 20uA Shutdown Mode

• Pulse-to-Pulse Over Current Protection

• Thermal Shutdown

•

Automatic Soft Start

Compact SOIC8 with Exposed Pad

Typical Application

INPUT

OUTPUT

BCT1583S .2/2007

Ver 1.1

Page 1

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Pin Assignment

Pin Descriptions

Pin #

Pin Name

Description

High Side Gate Drive Boost Input

Power Input

Power Switching Output

Ground

GND

Feedback Input

Compensation Node

COMP

Enable Input (H: Step-down Operation, L: All circuits deactivated)

Soft Start Control Input

BCT1583S .2/2007

Ver 1.1

Page 2

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Block Diagram

Absolute Maximum Specifications

Rating

Symbol

Value

Unit

Supply Voltage Range

Switch Voltage Range

V_IN

V_SW

V_BS

-0.3 to 28

-1 to V_IN+0.3

Vsw-0,3 to Vsw+6

-0.3 to 6

Volts

⁰C

Boost Voltage Range

All Other Pins

Storage Temperature Range

Maximum Operating Junction Temp

T_STR

T_J

-65 to 150

150

⁰C

BCT1583S .2/2007

Ver 1.1

Page 3

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Recommended Operating Ratings

Rating

Symbol

Value

Unit

Supply Voltage Range

V_IN

-4.5 to 20

-40 to 85

Volts

⁰C

Ambient Operating Temperature

T_OP

Electrical Specifications

All electrical specifications are specified at T_AMBIENT= 25⁰C, V_IN= 12V, unless otherwise specified.

Test

Symbol

Min

Typ

Max

Unit

µA

Parameter

Conditions

Shutdown Supply

Current

V_EN=0V

Supply Current

V_EN=4V

1.0

Feedback Voltage

(Simulated over all corners and

temperature)

V_FB

A_EA

G_EA

4.5V≤V_IN≤20V

1.150

1.222

1000

800

1.290

Error Amplifier

Voltage Gain

V/V

µA/V

Error Amplifier

Transconductance

∆I_COMP= ±10µA

High Side Switch-On

Resistance

R_DS(ON)1

100

mꢀ

ꢀ

Low Side Switch-On

Resistance

R_DS(ON)2

High Side Switch

Leakage Current

V_EN=0V,

V_SW=0V

µA

Upper Switch

Current Limit

5.5

Current Sense to

COMP

G_CS

3.8

A/V

Transconductance

F_OSC1

Oscillation Frequency

385

KHz

BCT1583S .2/2007

Ver 1.1

Page 4

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Short Circuit

F_OSC2

V_FB=0V

V_FB=1.0V

V_FB=1.5V

KHz

Oscillation Frequency

D_MAX

Maximum Duty Cycle

Minimum Duty Cycle

EN Threshold Voltage

EN Pull-up Current

D_MIN

3.1

1.9

3.4

600

V_EN=0V

µA

Under-Voltage

Lockout Threshold

Rising V_IN

Under-Voltage

Lockout Threshold

Hysteresis

⁰C

Soft Start Period

C_SS=0.1µF

Thermal Shutdown

160

BCT1583S .2/2007

Ver 1.1

Page 5

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Performance Characteristics

Switching Waveforms ( V_OUT& V_SW

)

Soft Start

V_IN/V_OUT= 12V/5V at Load Current 2A

Load Transient Waveform

V_IN/V_OUT= 12V/5V with a 1uF cap

Turn Off Waveform

V_IN/V_OUT= 12V/5V, 1A-2A Step

V_IN/V_OUT= 12V/5V at Load Current 2A

Efficiency at V_IN/V_OUT= 10V/5.0V

Efficiency at V_IN/V_OUT= 5.0V/1.8V

100%

95%

90%

85%

80%

75%

70%

65%

60%

55%

50%

100%

95%

90%

85%

80%

75%

70%

65%

60%

55%

50%

0.5

1.5

2.5

0.5

1.5

Load Current (A)

BCT1583S .2/2007

Ver 1.1

Page 6

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Typical Application Circuits

U2-B

100 nF

1uF

U2-C

U2-D

VIN

U2-A

COMP

GND

10nF

470uF

100nF

10nF

C10

180 pF

6.8k

U3-A

U3-B

22uH

VOUT

30BQ040

470uF

100 nF

U3-C

U3-D

GND

*R6 - R11 = OPEN

Figure 1: V_IN= 5V, V_OUT= 1.8V, I_OUT= 0A~3A

U2-B

.6k

100nF

U2-C

U2-D

VIN

U2-A

COMP

GND

10nF

470uF

100nF

10nF

100pF

U3-A

U3-B

22uH

VOUT

30BQ040

10nF

470uF

U3-C

U3-D

GND

*R6 - R11 = OPEN

Figure 2: V_IN= 12V, V_OUT= 5.0V, I_OUT= 0A~3A

BCT1583S .2/2007

Ver 1.1

Page 7

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Configuration Table

VOUT

1.8 V

2.5 V

3.3 V

5 V

4.7 nF

5.6 nF

8.2 nF

10 nF

3.3 nF

7.15 kΩ

15.4 kΩ

26.1 kΩ

46.4 kΩ

133 kΩ

3 kΩ

4.7 µH

3.9 kΩ

5.6 kΩ

7.5 kΩ

10 kΩ

4.7 – 6.8 µH

6.8 – 10 µH

10 – 15 µH

15 – 22 µH

12 V

Design Note

1. The voltage divider network formed by R4 and R5 sets the output voltage regulation point. It is

calculated by the equation below:

VOUT − VREF

Where: VREF = 1.22 V

R5 R4⋅

VREF

From this equation the closest standard (E48) resistance values were chosen. VOUT can be

further trimmed by adding a resistor across R5. Metal film resistors with 1% or less tolerance

are recommended.

2. The EN pin provides an enabling feature and has the following turn-on/off characteristic:

ON Threshold

OFF Threshold

= 3.1 V

= 0.7 V

To avoid intermittent turn-on/off, an Under Voltage Lock Out (UVLO) function is implemented by

R1 & R2. VINuvlo is the selected turn-on threshold of the device. Use this formula:

Where: VEN = 3.1 V

≈

∆

’

◊

VIN

1 +

⋅ VEN

uvlo

BCT1583S .2/2007

Ver 1.1

Page 8

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Package Information: SO8 (Exposed Pad)

SYMBOL

MIN (Millimeter)

1.350

MAX (Millimeter)

1.750

0.150

1.550

0.510

0.250

5.100

3.402

4.000

6.240

2.513

0.050

1.350

0.330

0.170

4.700

3.202

3.800

5.840

2.313

1.270 (BSC)

ꢀ

0.400

0^o

1.270

8^o

BCT1583S .2/2007

Ver 1.1

Page 9

BCT1583S

3A Step Down

DC/DC Converter

BlueChips Technology

A premier Mixed Signal Product Company

Marking Notation

IC Part Number

Date Code: yyww

1583S

XXXXX

Sales Offices

Malaysia

Hong Kong

BCT Technology Bhd (HQ)

BlueChips Technology Pte Ltd

Lot G4 Incubator 3

Technology Park Maysia

Bukit Jalil, 57000

Unit 906-911, 9/F., Stanhope House

734-738 King's Road,

North Point, Hong Kong

Kuala Lumpur, Malaysia

Tel : 852 2776 7968

Fax : 852 2776 8997

Tel : 603 8996 8088

Fax : 603 8996 8087

Singapore

BlueChips Technology Pte Ltd

3 International Business Park

#03-18/19/20

Nordic European Centre

Singapore 609927

Tel : 65 6890 6938

Fax : 65 6896 0928

Specifications are subject to changes without notification.

www.bluechipstech.com

BCT1583S .2/2007

Ver 1.1

Page 10

型号:	BCT8-08
是否Rohs认证：	符合
生命周期：	Contact Manufacturer
包装说明：	R-MXFM-D3
Reach Compliance Code：	unknown
风险等级：	5.7
其他特性：	LOW POWER LOSS
应用：	EFFICIENCY
配置：	COMMON CATHODE, 2 ELEMENTS
二极管元件材料：	SILICON
二极管类型：	RECTIFIER DIODE
最大正向电压 (VF)：	1 V
JESD-30 代码：	R-MXFM-D3
最大非重复峰值正向电流：	300 A
元件数量：	2
相数：	1
端子数量：	3
最高工作温度：	150 °C
最低工作温度：	-55 °C
最大输出电流：	4 A
封装主体材料：	METAL
封装形状：	RECTANGULAR
封装形式：	FLANGE MOUNT
峰值回流温度（摄氏度）：	NOT SPECIFIED
最大重复峰值反向电压：	800 V
最大反向电流：	10 µA
端子形式：	SOLDER LUG
端子位置：	UNSPECIFIED
处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

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