AAT3166

DATA SHEET AAT3166 AAT3166 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description The AAT3166 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 AAT3166 is capable of driving four LEDs for a total of 108mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving highercurrent LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUTCP) make this part ideally suited for small, batterypowered applications. Skyworks' AS2Cwire™ (Advanced Simple Serial Control) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA. For optimized efficiency, low-current settings require only 50µA of housekeeping current. Each outpu...