Datasheet > SGM3122

SGM3122

更新时间： 2024-02-04 20:04:53

品牌	Logo	应用领域
圣邦微 - SGMICRO		/
页数	文件大小	规格书
16页	2406K
描述
White LED Charge Pump Current Source with PWM Brightness Control

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SGM3122 数据手册

SGM3122

White LED Charge Pump Current

Source with PWM Brightness Control

GENERAL DESCRIPTION

FEATURES

The SGM3122 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.

● Input Voltage Range: 2.7V to 5.5V

● Drives up to 4 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 SGM3122 is capable of driving up to four 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 SGM3122 is available in a Green TQFN-3×3-16L

package, and is rated over the -40℃ to +85℃

temperature range.

PDAs

Keypad Backlight

SG Micro Corp

JANUARY2013–REV.A. 2

www.sg-micro.com

12 3 4 5 6 7...16

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与SGM3122相关器件

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SGM3122_16	SGMICRO	获取价格	White LED Charge Pump Current Source with PWM Brightness Control
SGM3122YTQ16G/TR	SGMICRO	获取价格	White LED Charge Pump Current Source with PWM Brightness Control
SGM3124	SGMICRO	获取价格	White LED Charge Pump Current Source with PWM Brightness Control
SGM3124_16	SGMICRO	获取价格	White LED Charge Pump Current Source with PWM Brightness Control
SGM3124YTQ16G/TR	SGMICRO	获取价格	White LED Charge Pump Current Source with PWM Brightness Control
SGM3127	SGMICRO	获取价格	White LED Driver with Low Dropout Current Source
SGM3127_18	SGMICRO	获取价格	White LED Driver with Low Dropout Current Source
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SGM-3-13	SYNERGY	获取价格	DOUBLE-BALANCED MIXER SURFACE SURFACE 1350 - 7000 MHz
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