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EV-128 AAT3174 Eval: High-current, high-efficiency charge pump

Posted: 09 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:AAT3174 application note? white LED? charge pump?

The AAT3174 evaluation board demonstrates the functionality of AnalogicTech's AAT3174 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 efficiency for both flash and movie modes. The LED drive current is programmable in 16 steps through the Simple Serial Control (S2Cwire) interface. An external set resistor determines the maximum LED drive current and it can be set up to 800mA. By default, the evaluation board is set to 600mA maximum LED drive current. This document describes the evaluation board and its accompanying user interface.

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