SGM3142 Datasheet, PDF (1/14 Pages) SG Micro Corp – Driver with Low Dropout Current Source

SGM3142
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3142 is a high efficiency and cost effective
charge pump white LED driver. It supports up to 6 white
LEDs and regulates a constant current for uniform
intensity. 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.
User can easily configure each LED current from
1.25mA to 20mA by a pulse dimming control. 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 SGM3142 is available in Green TQFN-4×4-16L
package and is specified over an ambient temperature
range of -40℃ to +85℃.
FEATURES
● Input Voltage Range: 2.7V to 5.5V
● Drives up to 6 LEDs at 20mA Each
● 16-Step Brightness Control
● High Efficiency by Fractional Conversion with
1× and 1.5× Modes
● Automatic Charge Pump Mode Selection
● Switching Frequency: 1MHz
● 1% Typical LED Current Matching
● Internal Soft-Start Limits Inrush Current
● Low Input Noise and Low EMI
● Over-Current and Over-Temperature Protection
● Output Over-Voltage Protection
● Under-Voltage Lockout with Hysteresis
● Available in Green TQFN-4×4-16L Package
APPLICATIONS
White LED Backlighting
White Photo-Flash for DSCs
Color (RGB) Lighting
Programmable Current Source
SG Micro Corp
www.sg-micro.com
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