SGM3145 Datasheet, PDF (1/12 Pages) SG Micro Corp – 8-Channel PWM Dimming Charge Pump White LED Driver

SGM3145
8-Channel PWM Dimming
Charge Pump White LED Driver
GENERAL DESCRIPTION
The SGM3145 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 SGM3145 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 PWM
dimming to adjust the brightness of LED. Users can
easily configure the LED current from 0mA to 27mA by a
digital PWM signal. SGM3145 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 SGM3145 is available in Green TQFN-3×3-20L
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 8 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-3×3-20L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
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