AAT3172

High Current LED Flash Driver Charge Pump IC General Description The AAT3172 is a high output current, high efficiency, low noise, low profile charge pump DC/DC converter, ideal for multi-function LED photo-flash applications where solution cost, size, and efficiency are critical. The dual charge pump in the AAT3172 is capable of delivering 600mA output current. Two currentcontrolled paths are available for users of dual flash LEDs that prefer current matching. Each LED channel can be easily programmed in 32 steps with a single GPIO output through the AS2Cwire™ (Advanced Simple Serial Control™) interface. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. The tri-mode (1X/1.5X/2X) operation of the internal charge pump offers excellent power efficiency for both flash and movie modes. Combined with a low external parts count (two 1µF flying capacitors and one small bypass capacitor at VIN and OUT), the AAT3172 is ideally suited for small, battery-powered applications. The AAT3172 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1.0µA. The AAT3172 is available in the Pb-free, thermallyenhanced, 12-pin 3x3mm TDFN package. AAT3172 Features • • • • • • • • • • • • • • ChargePump™ VIN Range: 2.7V to 5.5V 600mA Output Current Tri-Mode 1X/1.5X/2X in Current Mode Voltage Mode Operation: 1.5X, 100mA Dual Regulated Current Sinks Current Match Between Current Sinks 32 Current Steps Set by AS2Cwire 1µF Input, Output, and Flying Capacitors