SC628A Datasheet | SEMTECH

LED Flash Driver POWER MANAGEMENT Features - - - - - - - - - - - Charge Pump with 1000m A Flash Mode, 275m A Spotlight Mode, and I2C Interface Description The SC628A is a high efficiency charge pump LED driver using Semtech’s proprietary charge pump technology. Performance is optimized for use in single-cell Li-ion battery applications. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. The charge pump provides continuous spotlight mode current or pulsed flash mode current to an LED using a dedicated current sink. In flash mode, a flash-timeout feature turns off the flash if active for longer than 1 second. In spotlight mode, the timeout feature is disabled to allow continuous operation of the LED. The SC628A uses an I2C patible serial interface to set the flash mode or the spotlight mode current. The flash/ spotlight output is triggered via either the I2C interface or a dedicated flash enable pin (FLEN). 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 Flash LED - 1000m A max in flash mode, 275m A max continuous for spotlight Charge pump frequency - 250k Hz I2C patible interface - up to 400k Hz External flash control pin to sync with camera One second flash time out with disable feature Automatic sleep mode (flash 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 .. Typical Application Circuit VBAT = 3.0V to 5.5V CIN 4.7μF I2C Data I C Clock Flash Control Enable Control FLASH IN SDA SCL FLEN EN COUT 4.7μF FL AGND PGND C1+ C1C2+ C2- C1 2.2μF C2...