AAT3114ISN-20-T1

DATA SHEET AAT3113/3114 High Efficiency 1.5X Fractional Charge Pumps for White LED Applications General Description Features The AAT3113 and AAT3114 are low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1μF flying capacitors and two small bypass capacitors at VIN and OUT) makes these devices ideally suited for small, battery-powered applications. • • • • Skyworks' Simple Serial Control (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. AAT3113 and AAT3114 devices have a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during startup. A high switching frequency enables the use of small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3113 provides four LED current source outputs, and the AAT3114 provides six. The AAT3113 is available in a Pb-free 12-pin TSOPJW package, and the AAT3114 is available in a Pb-free 16-pin QFN package. • • • • • • • • • • • • • AAT3113: Four Outputs AAT3114: Six Outputs 20mA Full-Scale Current Simple Serial Control (S2Cwire) Interface ▪ 32-Position Logarithmic Scale with Digital Control Low Noise Constant Frequency Operation 33% Less Input Current Than Doubler Charge Pump High Accuracy Brightness Matching Small Application Circuit Regulated Output Current Automatic Soft Start VIN Range: 2.7V to 5.5V No Inductors 600kHz Switching Frequency IQ