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AAT3172 Eval: High-current LED flash driver charge pump IC

Posted: 07 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:AAT3172 application note? flash driver? charge pump IC?

The AAT3172 evaluation board demonstrates the functionality of AnalogicTech's AAT3172 and its application as a high-current white LED flash driver. The device consists of a tri-mode charge pump with load switch (1X), fractional (1.5X), and doubling (2X) conversion modes to provide excellent efficiency for both flash and movie modes. Two LED channels are provided with excellent current matching. By utilizing the two LED channels, better light efficiency can be achieved with two LEDs as opposed to one. The charge pump is designed to deliver 600mA total LED drive current. Through the Advanced Simple Serial Control interface (AS2Cwire), an additional constant voltage mode is available. Constant voltage mode produces a regulated 4.5V output that is capable of driving loads up to 100mA. In addition to driving LEDs for flash applications, other loads such as keypad lighting can also be powered from the 4.5V output. This document describes the evaluation board and its accompanying user interface.

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