Description

The SC621 is a high efficiency 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 flash mode, 250mA max continuous for spotlight

■ Two programmable 200mA low-noise LDO regulators

■ 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 flash control pin to sync with camera

■ Optional 1s flash time out

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

■ Low shutdown current — 0.1μA (typical)

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

■ Lead-free and halogen-free

■ WEEE and RoHS compliant

Applications

■ Cellular phone backlighting and flash

■ PDA backlighting and flash

■ Camera I/O and core power