SC621

POWER MANAGEMENT SC621 LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface Features Description „ 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 ) — I = 100μA Q „ 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 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. The charge pump provides backlight current in conjunction with four matched current sinks. It also can supply continuous or bursted current to a flash LED using the dedicated flash driver current sink. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. A...