Datasheet > SGM3140

SGM3140

更新时间： 2024-10-03 11:12:55

品牌	Logo	应用领域
圣邦微 - SGMICRO		/
页数	文件大小	规格书
10页	704K
描述
500mA Buck/Boost Charge Pump LED Driver

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SGM3140 数据手册

SGM3140

500mA Buck/Boost

Charge Pump LED Driver

GENERAL DESCRIPTION

FEATURES

The SGM3140 is a current-regulated buck/boost

charge pump LED driver capable of driving 500mA

output current. It is ideal for powering high brightness

LEDs for camera flash applications. The SGM3140 has

1×/2× operation mode to control the output current for

flash and torch modes.

● Input Voltage Range: 2.7V to 5.5V

● Up to 500mA Output Current

● Up to 90% Efficiency in Torch Mode

● Programmable Flash Current

● Automatic Buck/Boost Mode Conversion

● No External Inductors

● High Switching Frequency: 2.2MHz

● Low Reference for Low Loss Sensing: 47mV

● Less than 1μA Shutdown Current

● Automatic Soft-Start for Reducing Inrush Current

● Low Input and Output Ripple and Low EMI

● Protection Features

The supply voltage operates from 2.7V to 5.5V and is

well suited for various applications powered by a 1-cell

Li-Ion battery, as well as 3-cell or 4-cell NiCd, NiMH or

Alkaline batteries. The SGM3140 automatically converts

between boost and buck modes. Therefore, it ensures

that LED current cannot be restricted by the forward

voltage. High switching frequency makes it easy to use

tiny components. Small 0603 current sense resistors

can be used due to the low FB reference voltage.

 Output Over-Voltage Protection

 Over-Current Protection

 Thermal Shutdown

● Available in a Green TDFN-3×3-10L Package

The SGM3140 provides very low shutdown current and

soft-start function. Built-in soft-start circuitry avoids

excessive inrush current during startup. The SGM3140

also includes a comprehensive set of protection

features such as over-voltage protection, over-current

protection and thermal shutdown.

APPLICATIONS

White LED Torch or Flash for Cell

Phones, Camcorders and DSCs

Generic Lighting, Strobe and Flash Applications

White LED Backlighting

The SGM3140 is available in a Green TDFN-3×3-10L

package and is specified over an ambient temperature

range of -40℃ to +85℃.

General Purpose High Current Boost

TYPICAL APPLICATION

V_IN

VOUT

VIN

2.7V to 5.5V

C_IN

4.7µF

C_OUT

1µF

PGND

C_F

1µF

WLED

SGM3140

SGND

Torch Mode/Flash Mode

Enable

FLASH

RSET

R_SET

86.6kΩ

R_SENSE

0.33Ω

Figure 1. Typical Application Circuit

SG Micro Corp

OCTOBER2012–REV. A. 2

www.sg-micro.com

12 3 4 5 6 7...10

中文翻译

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与SGM3140相关器件

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SGM3140B	SGMICRO	获取价格	500mA Buck/Boost Charge Pump LED Driver
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SGM3142YTQE16G/TR	SGMICRO	获取价格	6-Channel Charge Pump White LED Driver with Low Dropout Current Source
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