AAT3177

The AAT3177 is a high output current, high efficiency, low noise, low profile charge pump DC/DC converter. The device is ideal for multi-functional LED photo-flash applications where solution cost, size, and efficiency are critical. For safety reasons the AAT3177 includes an externally programmable timer to automatically terminate a flash pulse in the unlikely event of a software failure. The timer is only active for the high current modes (DATA 1-4) to allow the device to be also used in modie-mode/torch applications.

The AAT3177 is capable of driving a regulated output current up to 800mA. Output current levels can be easily programmed in 16 steps through AnalogicTech Simple Serial Control™ (S²Cwire™) interface controlled by a single microcontroller GPIO line. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. The maximum output current can also be set with an external RSET resistor.

The tri-mode (1X/1.5X/2X) operation of the internal charge pump offers excellent power efficiency throughout the output current range for both flash and movie modes. Combined with a low external parts count (two 1F flying capacitors and two small bypass capacitors at V_IN and OUT), the AAT3177 is ideally suited for small battery-powered applications.

The AAT3177 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1A.

The AAT3177 is available in a Pb-free, thermally-enhanced 12-pin 3x3mm TDFN package and is specified over the -40C to +85C temperature range.