ALT80802 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - Automotive AEC-Q100 qualified - Supports buck-boost or buck mode operation - Supply voltage from 3.8 to 50 V in buck mode ▫ Handles automotive load dump and cold crank ▫ Also supports buck mode from a pre-boost supply - Supports up to 16 V output in buck-boost mode for 4 WLEDs - 150 mΩ integrated MOSFET switch - Programmable switching frequency up to 2.5 MHz for small solution size and operation above AM band - Designed for low EMC with frequency dithering - Integrated level shifting allows ground-referenced enable and fault flag in buck-boost mode - PWM dimming via direct logic input or power supply voltage - Robust protection against: ▫ Adjacent pin-to-pin short ▫ Pin-to-VSS (IC ground) short ▫ ponent open/short faults APPLICATIONS Automotive lighting - Daytime running lights - Front and rear fog lights - Turn/stop lights - Map light - Dimmable interior lights PACKAGE: 10-Pin DFN with Exposed Thermal Pad and Wettable Flank (suffix EJ) Not to scale DESCRIPTION The ALT80802 is a high-frequency switching regulator that provides constant output current to drive high-power LEDs. It integrates a power MOSFET for step-down or inverting buckboost conversion. With current-mode control and simple external pensation, the ALT80802 can achieve fast transient response. The wide input range of 3.8 to 50 V makes the ALT80802 suitable for a wide range of lighting applications, including those in an automotive input environment. The device rating also enables a simple solution for driving 3 to 4 WLEDs in buckboost configuration- a very mon application requirement for automotive lighting applications. The ALT80802 is designed to aid in EMC/EMI design by frequency dithering, soft freewheel diode turn-off, and wellcontrolled switch node slew rates. A programmable oscillator allows the ALT80802 to switch outside EMI-sensitive frequency bands such as the AM band. With current-mode control and simple external pensation, the ALT80802 can achieve fast transient...