SC623A Datasheet | SEMTECH

LED Light Management Unit POWER MANAGEMENT Features - - - - - - - - - - - - - - - Charge Pump, 4 LEDs, 400m A Flash LED, and I2C Interface Description The SC623A 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. 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. An optional fading feature that gradually adjusts the backlight current is provided to simplify control software. A flash-timeout feature disables the flash if active for longer than 1 second. The SC623A uses an I2C patible serial interface. The interface controls all functions of the device, including backlight and flash currents. The flash/spotlight output is triggered via either the I2C interface or a dedicated pin. In sleep mode, the device reduces quiescent current to 100μA while continuing to monitor the serial interface. 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 Flash LED - 400m A max in flash mode, 250m A max continuous for spotlight Charge pump frequency - 250k Hz I2C patible interface - up to 400k Hz 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 Fully WEEE and Ro HS pliant Applications - Cellular phone backlighting and flash - PDA backlighting and flash - Camera I/O and core...