Date: 29/09/2009

Backlight driver for 7 LEDs with charge pump and PWM control

The SC656 from Semtech is a high efficiency charge pump LED driver using Semtech's proprietary charge pump technology. Performance is optimized for use in single-cell Li-ion battery applications.

Features

Input supply voltage range - 2.9V to 5.5V
Charge pump modes - 1x, 1.5x and 2x
PWM dimming control with low pass filter provides
DC backlight current (not pulsed)
Two independently configurable backlight banks
PWM frequency range - 200Hz to 50kHz
Seven adjustable current sinks - 500µA to 25mA
Backlight current accuracy ±1.5% typical
Backlight current matching ±0.5% typical
LED float detection
Charge pump frequency - 250kHz
Low shutdown current - 0.1µA typical
Fully WEEE and RoHS compliant, and Halogen free.

The suggested applications of this device are, Cellular phones, smart phones, and PDAs, LCD display modules, Portable media players, Digital cameras, Personal navigation devices, and Display/keypad backlighting and LED indicators

Package: MLPQ-UT-20 of dimensions - 3 x 3 x 0.6(mm)

For more info visit www.semtech.com