SC622 Datasheet | SEMTECH

LED Light Management Unit POWER MANAGEMENT Features - - - - - - - - - - - - Charge Pump, 400m A Flash LED, Dual LDOs, and Sem Wire TM Interface Description The SC622 is a high efficiency charge pump LED driver using Semtech’s proprietary m Ah XLife TM technology. Performance is optimized for use in single-cell Li-ion battery applications. The charge pump provides continuous or bursted current to a flash LED using a dedicated flash driver current sink. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. A flashtimeout feature disables the flash if active for longer than 1 second. The SC622 also provides two low-dropout, lownoise linear regulators for powering a camera module or other peripheral circuits. The SC622 uses the proprietary Sem Wire TM single wire interface. The interface controls all functions of the device, including flash current and two LDO voltage outputs. The single wire implementation minimizes microcontroller and interface pin counts. The flash/spotlight output is triggered via either the Sem Wire interface or a dedicated pin. In sleep mode, the device reduces quiescent current to 100μA while continuing to monitor the serial interface. The two LDOs can be enabled when the device is in sleep mode. Total current reduces to 0.1μA in shutdown. Input supply voltage range - 3.0V to 5.5V Charge pump modes - 1x, 1.5x and 2x Flash LED - 400m A max in flash mode, 250m A max continuous for spotlight Two user-configurable 100m A low-noise LDO regulators Charge pump frequency - 250k Hz Sem Wire TM single wire interface - up to 75kbit/s 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 Fully WEEE and Ro HS pliant Applications - - Cellular phone flash PDA flash - Camera I/O and core power .. Typical Application Circuit FLASH VBAT CIN 2.2μF VIN Sem Wire...