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SGM3146 8-Channel Charge Pump White LED Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3146 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.
The SGM3146 supports up to 8 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 1.65mA to 27mA 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.
The SGM3146 is available in Green TQFN-3×3-20L package and is rated over the -40℃ to +85℃ temperature range.
FEATURES
Input Voltage Range: 2.7V to 5.5V Drives up to 8 LEDs at 27mA Each One Single Wire Interface 16-Step Brightness Control High Efficiency by Fractional Conversion with
1× and 1.5× Modes Switching Frequency: 0.93MHz Regulated Output Current with ±4.8% Matching Internal Soft-Start Limits Inrush Current Low Input Ripple and Low EMI Over-Current and Over-Temperature Protection Under-Voltage Lockout with Hysteresis Available in Green TQFN-3×3-20L Package
APPLICATIONS
Mobile Phone, DSC, MP3 White LED Backlighting LCD Display Supply
SG Micro Corp www.sg-micro.com
REV. A. 1
SGM3146
8-Channel Charge Pump White LED Driver with Low Dropout Current Source
PACKAGE/ORDERING INFORMATION
MODEL SGM3146
ORDER NUMBER SGM3146YTQG20G/TR
PACKAGE DESCRIPTION
TQFN-3×3-20L
SPECIFIED TEMPERATURE
RANGE
-40℃ to +85℃
PACKAGE OPTION
Tape and Reel, 3000
MARKING INFORMATION
SGM3146QG
ABSOLUTE MAXIMUM RATINGS
VIN to GND………………………………………….…...-0.3V to 6V The Other Pins to GND…………………………..…....-0.3V to VIN Power Dissipation, PD @ TA = 25℃ TQFN-3×3-20L…………………………….………..………1.48W Storage Temperature Range............................-65℃ to +150℃
Junction Temperature.................................................…...150℃
Operating Temperature Range...…..……….……-40℃ to +85℃ Lead Temperature (Soldering 10 sec) …………………………………..…..…….…....…..….…….. 260℃ ESD Susceptibility HBM…………………………………………………………...2000V MM………………………………………….….……….....……200V
CAUTION
This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range fro.