Datasheet > SGM3138

SGM3138

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
11页	2075K
描述
6-Channel Charge Pump White LED Driver with Low Dropout Current Source

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SGM3138 数据手册

SGM3138

6-Channel Charge Pump White LED Driver

with Low Dropout Current Source

GENERAL DESCRIPTION

FEATURES

The SGM3138 is a high performance white LED driver.

It integrates current sources and automatic mode

selection charge pump. The part maintains the high

efficiency by utilizing a 1×/1.5× fractional charge pump

and low dropout current sources. The small equivalent

1× mode open loop resistance and ultra-low dropout

voltage of current source extend the operating time of

1× mode and optimize the efficiency of Li-Ion battery in

white LED applications.

● Input Voltage Range: 2.7V to 5.5V

● Drives Up to 6 LEDs at 20mA Each

● One Single Wire Interface

● 16-Step Brightness Control

● High Efficiency by Fractional Conversion with

1× and 1.5× Modes

● Switching Frequency: 1MHz

● Regulated Output Current with ±5% Matching

● Internal Soft-Start Limits Inrush Current

● Low Input Ripple and Low EMI

The SGM3138 supports up to 6 white LEDs and

regulates a constant current which the initial value can

be set by an internal resistor. The part implements a

4-bit DAC for brightness control. Users can easily

configure the LED current from 1.25mA to 20mA by a

serial pulse. The dimming of white LEDs current can be

achieved by applying a pulse signal to the EN/SET pin.

There are totally 16 steps of current could be set by

users. The operating voltage range is 2.7V to 5.5V.

Internal soft-start circuitry effectively reduces the

in-rush current while both start-up and mode transition.

● Over-Current and Over-Temperature Protection

● Under-Voltage Lockout with Hysteresis

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

APPLICATIONS

Mobile Phone, DSC, MP3

White LED Backlighting

LCD Display Supply

The SGM3138 is available in Green TQFN-3×3-16L

package andis ratedover the-40℃ to +85℃ temperature

range.

SG Micro Corp

APRIL2014–REV.A. 4

www.sg-micro.com

12 3 4 5 6 7...11

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