AAT3169ISN-T1

LED照明驱动器 High Eff 1x/1.5x/2x Mode w/ PWM Control

The AAT3169 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 AAT3169 is capable of driving six LEDs for a total of 180mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current 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. AnalogicTech’s 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 65μA of housekeeping current. Each output of the AAT3169 is equipped with built-in protection for output short-circuit and auto-disable for load short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from the input and reduces quiescent current to less than 1μA. The AAT3169 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package, a 14-pin 3x3mm TDFN package, a low-profile 14-pin 3x3mm STDFN package or a 14-pin TSOPJW package and is rated over the -40°C to +85°C temperature range.