AAT3141

The AAT3141 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 device produces current levels up to 30mA on each of its four current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1F flying capacitors and two small 1F capacitors at V_IN and CP) make the AAT3141 ideally suited for small battery-powered applications. AnalogicTech Advanced Simple Serial Control (AS²Cwire) digital input is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3141 has a thermal management system to protect the device in the event of a short circuit condition at an 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. In shutdown mode, the device disconnects the load from V_IN and reduces quiescent current to less than 1A. The AAT3141 is available in the very small 12-pin TSOPJW package.

The AAT3141 is a low noise, constant frequency charge pump DC/DC converter that uses a tri mode load switch (1X), fractional (1.5X), and dou-bling (2X) conversion to maximize efficiency for White LED applications. The device produces cur-rent levels up to 30mAon each of its 4 current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or in parallel for driving high-er-current LEDs. Alow external parts count (two1|ìF flying capacitors and two small 1F capacito at V_IN, and CP) make the AAT3141 ideally suited for small battery-powered applications.