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Integrated RGB controllers simplify design of diode sequencing for portable systems

14th March 2006

Advanced Analogic Technologies Inc., Europe

ES Admin

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To generate the three colours in an RGB LED, designers would typically need to use three separate MOSFETs, all the associated interface circuitry, and three GPIO pins on the system processor to drive the RGB LED. With AnalogicTech’s AAT4295 and AAT4297, designers can now support up to two RGB LEDs while eliminating the need for discrete MOSFETs and save the GPIO lines for other system functions.

Targeted at portable systems, the two RGB controllers dramatically simplify the design and layout of fashion lighting functions by eliminating the need for multiple discrete devices while saving valuable GPIO resources.

The three-channel AAT4295 supports the use of a single RGB LED while the six-channel AAT4297 supports the design of systems with two RGB LEDs. The state of each output channel is controlled with a single GPIO line via the EN/SET pin using AnalogicTech’s Simple Serial Control? (S2Cwire?) serial digital interface. Both the AAT4295 and AAT4297 can also be used for general-purpose applications whenever a load requires a low-side switch connection to ground. The AAT4295 and AAT4297 operate over a 1.8V to 5.5V input range. Both devices consume less than 3µA of quiescent current.

Rated over the -40 to +85 degrees C temperature range, the AAT4295 and AAT4297 are available now. The AAT4295 is offered in a tiny (2.0x2.1mm) Pb-free, 8-pin SC70JW package, and the AAT4297 is offered in a Pb-free, 12-pin TSOPJW package.