SGM3131 Datasheet, PDF (1/13 Pages) SG Micro Corp – Driver with Low Dropout Current Source

SGM3131
120mA 4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3131 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 SGM3131 supports up to 4 white LEDs and
regulates a constant current which the initial value can
be set by an external resistor. The part implements a
4-bit DAC for brightness control. Users can easily
configure the LED current from 0.5mA to 30mA by a
serial pulse. The dimming of white LEDs current can be
achieved by applying a pulse signal to the EN 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 load is disconnected from VIN while shutdown and
the shutdown current is less than 1μA.
SGM3131 is available in Green TQFN-3×3-16L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
FEATURES
 Input Voltage Range: 2.7V to 5.5V
 Drives up to 4 LEDs at 30mA Each
 LED Brightness Control Through Single
Wire Interface
 16-Step Brightness Control
 High Efficiency by Fractional Conversion with
1× and 1.5× Modes
 Switching Frequency: 1MHz
 Regulated Output Current with 1% Matching
 Internal Soft-Start Limits Inrush Current
 Low Input Ripple and Low EMI
 Over Current and Over Temperature Protected
 Under Voltage Lockout with Hysteresis
 Operating Temperature Range: -40℃ to +85℃
 Available in Green TQFN-3×3-16L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
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