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EV-122 AAT3175 Eval: High-efficiency 1X/1.5X/2X charge pump for white LED flash apps

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

Keywords:AAT3175 application note? charge pump? white LED?

The AAT3175 evaluation board demonstrates the functionality of AnalogicTech's AAT3175 and its application as a white LED flash driver. The AAT3175 is a low-noise, constant frequency charge pump DC/DC converter with tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency and operate over a wide input voltage range. The AAT3175 is programmable with AnalogicTech's S2Cwire (Simple Serial Control) serial interface and has four independent, constant current LED channels. LED constant current levels are set according to a 16-level logarithmic scale. The device is able to achieve a flash current level of 300mA while requiring only 1?F capacitors. This document describes the evaluation board and its accompanying user interface.

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