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SGM3122

Shengbang Microelectronics
Part Number SGM3122
Manufacturer Shengbang Microelectronics
Description White LED Charge Pump Current Source
Published May 20, 2016
Detailed Description SGM3122 White LED Charge Pump Current Source with PWM Brightness Control GENERAL DESCRIPTION The SGM3122 is a charge pu...
Datasheet PDF File SGM3122 PDF File

SGM3122
SGM3122

Overview
SGM3122 White LED Charge Pump Current Source with PWM Brightness Control GENERAL DESCRIPTION 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.
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.
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.
The SGM3122 is available in a Green TQFN-3×3-16L package, and is rated over the -40°C to +85°C temperature range.
FEATURES  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  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 APPLICATIONS Cellular Phones Smart Phones Digital Cameras Handheld PCs Camcorders PDAs Keypad Backlight SG Micro Corp www.
sg-micro.
com REV.
A.
2 SGM3122 White LED Charge Pump Current Source with PWM Brightness Control PACKAGE/ORDERING INFORMATION ORDER NUMBER SGM3122YTQ16G/TR PACKAGE DESCRIPTION TQFN-3×3-16L SPECIFIED TEMPERATURE RANGE -40°C to +85°C PACKAGE OPTION Tape an...


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