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AAT4295 Eval: Single RGB controller

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

Keywords:AAT4295 application note? RGB LED? single controller?

The AAT4295 evaluation board demonstrates the operation of AnalogicTech's AAT4295 SmartSwitch. This device has three low side n-channel load switches that are serially controlled. The AAT4295 operates from 1.8V to 5.5V, making it suitable for use in 2.5V, 3.3V, or 5V systems as well as systems powered by Li-ion/polymer batteries. For demonstration purposes, an AAT3110 voltage doubling charge pump has been incorporated to provide a regulated voltage source to power the system load, which is an RGB LED. The AAT4295 is controlled by an S2Cwire (Simple Serial Control) interface with easy control and efficiency. The device is enabled with the desired switch configuration after a short set of data pulses is sent to the EN/SET input and holding the line pulled to a logic high. In the enabled state, the AAT4295 typically consumes less than 3?A of quiescent current. When EN/SET is pulled to a logic low, the device is disabled and each output switch is placed in a high impedance open state. The switch resistance of the low side n-channel MOSFET switches is approximately 2&937;. This document describes the evaluation board and its accompanying user interface.

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