SC624 Datasheet | SEMTECH

LED Light Management Unit POWER MANAGEMENT Features - - - - - - - - - - - - - Charge Pump, 4 LEDs, Dual LDOs, and Sem Wire TM Interface Description The SC624 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 backlight current in conjunction with four matched current sinks. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. An optional fading feature that gradually adjusts the backlight current is provided to simplify control software. The SC624 also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits. The SC624 uses the proprietary Sem Wire TM single wire interface. The interface controls all functions of the device, including backlight current and two LDO voltage outputs. The single wire implementation minimizes microcontroller and interface pin counts. 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 Four programmable current sinks with 32 steps from 0.5m A to 25m A Two user-configurable 100m A low-noise LDO regulators Charge pump frequency - 250k Hz Sem Wire TM 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 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 backlighting - PDA backlighting - Camera I/O and core power .. Typical Application Circuit MAIN BACKLIGHT VBAT CIN 1 μF Sem Wire Interface VIN...