Allegro MicroSystems ALT80800 PWM Dimmable Synchronous Buck LED Driver

Allegro MicroSystems ALT80800 PWM Dimmable Synchronous Buck LED Driver is AEC-Q100 qualified and provides constant current output to drive high-power LEDs. High-side and low-side N-channel DMOS switches are integrated for DC-to-DC step-down conversion, and a true average current is output using a cycle-by-cycle, controlled on-time method. While the output current is user-selectable by an external current sense resistor, the output voltage is automatically adjusted to drive various LEDs in a single string, ensuring optimal efficiency. LED dimming is achieved by a direct logic input pulse-width modulation (PWM) signal at the PWM pin while EN is enabled. However, applying a PWM signal at the EN pin while the PWM pin is high can enable "chopped battery" PWM dimming for legacy control modules. Allegro MicroSystems ALT80800 LED driver is available in a 16-pin TSSOP package with an exposed thermal pad for enhanced thermal dissipation.