AAT3122 Datasheet | AAT

Description The AAT3122 is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) conversion to increase efficiency in white LED applications. With input voltages ranging from 2.7V to 5.5V, the device can produce an output current of up to 120m A. A low external parts count (two 1µF flying capacitors and two small bypass capacitors at VIN and OUT) makes the AAT3122 ideally suited for small battery-powered applications. Features - - - - - - - - Charge Pump™ - Analogic Tech's Simple Serial Control™ (S2Cwire™) - interface is used to enable, disable, and set the - LED drive current with a 32-level logarithmic scale - LED brightness control. The AAT3122 has a ther- mal management system to protect the device in - the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small exter Applications nal capacitors. A low shutdown current feature disconnects the load from VIN and reduces quiescent Programmable Current Source .. - current to less than 1µA. The AAT3122 provides a - White LED Backlighting single current source output that can be used to drive up to six LEDs at 20m A each. The AAT3122 is available in a Pb-free TSOPJW-12 package. VIN Range: 2.7V to 5.5V <1µA of Shutdown Current 1 MHz Switching Frequency Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency Only Four External ponents Simple Serial Control (S2Cwire) Interface Low Noise Constant Frequency Operation 33% Less Input Current Than Doubler Charge Pumps Small Application Circuit Regulated Output Current Automatic Soft Start No Inductors TSOPJW-12 Package -40°C to +85°C Temperature Range Typical Application VIN C1+ C1 1µF VOUT VBATTERY CIN 1µF COUT 1µF C2EN/SET EN/SET GND D C1C2+ C2 1µF D1 D2 D3 D4 D5 D6 High Efficiency 1X/1.5X Fractional Charge Pump for White LED...