AAT3120 Datasheet | AAT

3-Channel Charge Pump For White LED Applications General Description The AAT3120 is a low noise, constant frequency charge pump DC/DC converter that uses fractional (1.5X) conversion to improve efficiency for white LED applications. The device can be used to produce eight current levels up to 20m A per channel for up to three channels. 1X load switch mode is also built-in to improve efficiency at low current settings. Low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and OUT) makes the AAT3120 ideally suited for small battery-powered applications. Analogic Tech's S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED at eight different levels. Features - - - - Charge Pump™ - - - - - - - VIN Range: 2.7V to 5.5V Fractional Charge Pump Mode Drives Low-VF and High-VF Type LEDs Up to Three LED Outputs - Single Wire Programming - Eight Regulated Current Settings - Max 20m A per Channel Low Noise Constant Frequency Operation No Inductors 1MHz Switching Frequency Small Application Circuit Automatic Soft-Start IQ <1µA in Shutdown 12-Pin TSOPJW Package The AAT3120 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 circuit Applications ry prevents excessive inrush current during startup. A high charge pump switching frequency - Color (RGB) Lighting enables the use of very small external capacitors. - Programmable Current Source A low current shutdown feature disconnects .. the - White LED Backlighting load from VIN and reduces quiescent current to less - White Photo Flash for DSCs than 1µA. The AAT3120 is available in the very small Pb-free 12-pin TSOPJW package. Typical Application VIN C1+ C1 1 µF VOUT VBATTERY CIN 1µF C OUT 1µF C1C2+ C2 1 µF C2D1 D2 D3 EN/SET EN/SET GND D3 D2 D1 3-Channel Charge Pump For White LED Applications...