SGM3144 Datasheet, PDF (1/12 Pages) SG Micro Corp – Charge Pump White LED Driver

SGM3144
6-Channel PWM Dimming
Charge Pump White LED Driver
GENERAL DESCRIPTION
The SGM3144 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 SGM3144 supports up to 6 white LEDs and
regulates a constant current which the initial value can
be set by an internal resistor. The part implements
PWM dimming to adjust the brightness of LED. Users
can easily configure the LED current from 0mA to
27mA by a digital PWM signal. SGM3144 can be
turned off by EN pin. 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 SGM3144 is available in 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 6 LEDs at 27mA Each
 PWM Dimming
 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-3×3-16L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
REV. A. 1