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Description

The SC623 is a high efciency charge pump LED driver using Semtech’s proprietary mAhXLifeTM technology. Performance is optimized for use in single-cell Li-ion battery applications.

Features

■ Input supply voltage range — 3.0V to 5.5V

■ Charge pump modes — 1x, 1.5x and 2x

■ Four programmable current sinks with 32 steps from

0.5mA to 25mA

■ Flash LED — 400mA max in ?ash mode, 250mA max

continuous for spotlight

■ Charge pump frequency — 250kHz

■ SemWireTM single wire interface — up to 75kbit/s

■ Backlight current accuracy ±1.5 typical

■ Backlight current matching ±0.5 typical

■ Programmable fade-in/fade-out for main backlight

■ External ?ash control pin to sync with camera

■ Optional 1s ?ash time out

■ Automatic sleep mode (LEDs o? ) — IQ = 100μA

■ Low shutdown current — 0.1μA (typical)

■ Ultra-thin package — 3mm x 3mm x 0.6mm

■ Fully WEEE and RoHS compliant

Applications

■ Cellular phone backlighting and ?ash

■ PDA backlighting and ?ash