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