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AAT2847 Eval: 4-channel backlight driver with dual LDOs

Posted: 05 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:WLED backlight driver? dual LDO? DC/DC converter? AAT2847 application note? AnalogicTech?

AnalogicTech's AAT2847 is a highly integrated power solution for single cell Li-ion/poly-based LCD display applications. It includes a four-channel LED backlight driver and two integrated 200mA LDOs as additional power supplies for display and camera-related chipsets. The backlight driver in the AAT2847 is a low-noise tri-mode DC/DC charge pump converter. Each of the four channels of the backlight driver is capable of delivering up to 20mA of bias current for white LEDs. The WLED backlight bias current matching is 1 percent, which helps provide uniform display brightness. AnalogicTech�s AS?Cwire (Advanced Simple Serial Control) serial digital interface is used to enable, disable and set the current for each backlight LED channel. Each LED channel has 16 available current level settings in three separate current scales, plus four available current level settings on a low level current scale. Each LED channel is equipped with built-in short-circuit protection and auto disable functionality. A low shutdown current feature disconnects the load from the input and reduces quiescent current to less than 1?A. The AAT2847 is available in the thermally enhanced 20-pin 3mm x 4mm x 0.75mm TQFN package.

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