SC635

POWER MANAGEMENT Description The SC635 is a high-current charge pump designed specifically for use with white LEDs used in camera flash applications. Only two small bucket capacitors are required to develop the output drive, providing a low EMI solution compared to inductive boost regulators. The SC635 has two modes of operation: Flash mode and Spotlight mode. In Flash mode, the SC635 is capable of delivering 200mA to a high-intensity LED during image capture. In Spotlight mode the SC635 outputs 40% of the Flash mode current for general purpose lighting or status indication. An external resistor is connected in series with the LED to set the current. In Flash mode, this resistor can dissipate up to 50mW, reducing the power dissipation requirement of the SC635. The flash input (FLASH) overrides the control input (CTRL) to make sure the flash function is activated when called for. The thermally efficient MLPD-10 package and ceramic bypass and bucket capacitors make the SC635 a high output current driver that requires minimal PCB area. Charge Pump Flash LED Driver Features SC635 u u u u u Two selectable modes - Flash and Spotlight 200mA max output - Flash Mode Spotlight mode set to 40% of Flash Current 3.0V to 5.25V Input Range External pins for control of flash and spotlight modes for synchronization to a camera module or graphics controller u Short circuit, over-voltage, and over-temperature protection u Soft-start functionality u Micro Lead Package MLPD-10, ...