AAT3169

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 1F flying capacitors and two small 1F capacitors at IN and

OUTCP) make this part ideally suited for small, battery-powered applications.

AnalogicTech 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 115A. For optimized efficiency, low-current settings require only 65A 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 1A.

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 -40C to +85C temperature range.

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, battery-powered 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 builtin protection for output short-circuit and auto-disable for load short-circuit conditions. Built-in softstart 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 or a low-profile 14-pin 3x3mm STDFN package and is rated over the -40°C to +85°C temperature range.