By utilising AnalogicTech’s AAT1231, designers can use a single wire to digitally control white LEDs. The AAT1231 is a high frequency, inductive boost DC/DC converter for controlling white LEDs in portable systems operating from single-cell lithium-ion/polymer batteries. Delivering 50mA up to 24V, the device is capable of driving up to six white LEDs in series or up to 12 white LEDs in a parallel/series configuration using AnalogicTech’s digital Simple Serial Control (S2Cwire) single-wire interface.

LED output current on the AAT1231 is controlled using AnalogicTech’s S2Cwire interface in 16 linear steps. By changing the feedback voltage with the SEL pin, designers can extend the output voltage another 16 levels. The AAT1231 delivers an overall efficiency up to 82%. The device also adds a true load disconnect feature which completely isolates the load from the power source. By reducing leakage current to less than 1µA, this function extends battery life and system standby time. AnalogicTech’s device also offers standard protection features, including integrated soft-start, current limit, over-temperature, and over-voltage protection. Specified over the -40 to +85 degrees C temperature range, the AAT1231 is immediately available in a Pb-free, 12-pin TSOPJW package.