AAT3131 Datasheet | Skyworks Solutions

Description The AAT3131 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 maximize efficiency for white LED applications. The device can be used to produce current levels up to 20m A in three of its outputs and 30m A in one of its outputs to drive LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or paralleled for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and OUT) makes the AAT3131 ideally suited for small battery-powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current in two groups: the three 20m A outputs and the single 30m A output with multiple level logarithmic scales. The AAT3131 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. A high charge pump switching frequency enables the use of very small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3131 is available in a Pb-free 12-pin TSOPJW12 package and is rated over the -40°C to +85°C temperature range. Features - VIN Range: 2.7V to 5.5V - <1.0µA of Shutdown Current - 1MHz Switching Frequency - White LED Backlighting - Fully Independent Display Lighting - Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency - Drives Low-VF and High-VF Type LEDs - Up to Three 20m A Outputs - Single 30m A Output - Multi-Position Logarithmic Scale with Digital Control - Low Noise Constant Frequency Operation - Regulated Output Current - Automatic Soft Start - No Inductors - Temperature Range: -40°C to +85°C - 12-Pin TSOPJW Package Applications - Color (RGB) Lighting - Programmable Current Source - White LED Backlighting - White Photo Flash for...