AAT3153

www.DataSheet4U.com AAT3153 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications General Description The AAT3153 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3153 is capable of driving sixchannel LEDs from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. Low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes this part ideally suited for small battery-powered applications. AnalogicTech's S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with eight settings (20mA down to 50µA) including main and sub-display group control. The AAT3153 consumes extremely low current internally (40µA typical) at light load for optimized efficiency. Each output of the AAT3153 is equipped with builtin protection for VOUT short circuit and auto-disable for load short-circuit condition. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3153 is available in a space-saving, thermalenhanced 16-pin 4x4mm QFN package. Features ChargePump™ VIN Range: 2.7V to 5.5V Fully Programmable Curr...