AAT3351

The AAT3351 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) charge pump to maximize efficiency for white LED applications. AAT3351 is capable of driving 4 white LEDs at a total of 120mA from single 2.7V to 5.5V input. The current sinks may be operated individually or in parallel while driving higher current LEDs. A low external parts count (two 1F flying capacitors and two small 1F capacitors at V_IN and V_OUT) makes the AAT3351 ideal for small battery-powered applications.

Analogic Tech S²Cwire™ serial digital input is used to enable, disable, and set current to one of 32 levels for the LEDs.

The AAT3351 is equipped with built-in short-circuit protection. The soft-start circuitry prevents excessive inrush current at start-up and mode transitions. The AAT3351 family is available in Pb-free, space-saving TSOPJW and TDFN33 packages, and operates over the -40C to +85C ambient temperature range.