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SGM3133 Datasheet, PDF (1/13 Pages) SG Micro Corp – Driver with Low Dropout Current Source | |||
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SGM3133
4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3133 is a high efficiency and cost effective
charge pump white LED driver. It supports up to 4 white
LEDs and regulates a constant current for uniform
intensity. The part maintains the high efficiency by
utilizing a 1Ã/1.5Ã fractional charge pump and low
dropout current sources. The small equivalent 1Ã mode
open loop resistance and ultra-low dropout voltage of
current source extend the operating time of 1Ã 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 SGM3133 is available in Green TQFN-3Ã3-16L
package and is specified over an ambient temperature
range of -40â to +85â.
FEATURES
â Input Voltage Range: 2.7V to 5.5V
â Drives up to 4 LEDs at 20mA Each
â 16-Step Brightness Control
â High Efficiency by Fractional Conversion with
1Ã and 1.5Ã Modes
â Automatic Charge Pump Mode Selection
â Switching Frequency: 1MHz
â 1% Typical LED Current Matching
â Internal Soft-Start Limits Inrush Current
â Low Input Noise and Low EMI
â Over Current and Over Temperature Protection
â Output Over Voltage Protection
â Under-Voltage Lockout with Hysteresis
â Available in Green TQFN-3Ã3-16L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
REV. A. 2
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