Datasheet > SGM3124YTQ16G/TR

SGM3124YTQ16G/TR

更新时间： 2024-10-03 01:14:39

品牌	Logo	应用领域
圣邦微 - SGMICRO		/
页数	文件大小	规格书
15页	2392K
描述
White LED Charge Pump Current Source with PWM Brightness Control

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SGM3124YTQ16G/TR 数据手册

SGM3124

White LED Charge Pump Current

Source with PWM Brightness Control

FEATURES

GENERAL DESCRIPTION

● Input Voltage Range: 2.7V to 5.5V

The SGM3124 is a charge pump with PWM brightness

control for white LED supplies in LCD display backlight

applications. The supply voltage ranges from 2.7V to

5.5V, it is ideally suited for all applications powered by

a single Li-Ion battery cell or three to four NiCd, NiMH,

or alkaline battery cells.

● Drives up to 3 LEDs at 30mA Each

● LED Brightness Control Through PWM Control

Signal

● High Efficiency by Fractional Conversion with 1×

and 1.5× Modes

● Switching Frequency: 1MHz

The device provides a constant current for each LED,

and the initial current value can be set by an external

resistor. High efficiency is achieved by utilizing a 1×/1.5×

fractional conversion technique in combination with

very low dropout current sources.

● Regulated Output Current with 0.5% Matching

● Internal Soft-Start Limits Inrush Current

● Low Input Ripple and Low EMI

● Over-Current and Over-Temperature Protected

● Under-Voltage Lockout with Hysteresis

● Available in Green TQFN-3×3-16L Package

The SGM3124 is capable of driving up to three

channels of LEDs at 30mA per channel from a 2.7V to

5.5V input. Additionally, the current controlled charge

pump ensures low input current ripple and EMI. A low

external part count (two 0.47µF flying capacitors and

two small 1µF capacitors at VIN and VOUT) makes this

part ideally suited for small, battery-powered

applications.

APPLICATIONS

Cellular Phones

Smart Phones

Digital Cameras

Handheld PCs

Camcorders

The SGM3124 is available in a Green, space-saving

TQFN-3×3-16L package, and is rated over the -40℃ to

+85℃ temperature range.

PDAs

Keypad Backlight

TYPICAL APPLICATION

0.47μF

C2- C1-

C1+ C2+

VOUT

VIN

C_OUT

1μF

Li-ion

Battery

C_IN

1μF

EN1

SGM3124

EN2

ISET GND PGND

RSET

SG Micro Corp

www.sg-micro.com

JANUARY2013–REV.A.1

12 3 4 5 6 7...15

中文翻译

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