Allegro's A8513 is a single-output white LED (WLED) driver for LCD backlighting. It integrates a current-mode boost converter with an internal power switch and one current sink. The A8513 can operate from a single 4.5 to 40 V power supply to accommodate start/stop, cold crank, and load dump requirements. A 2 MHz boost converter switching frequency allows the A8513 to operate above the AM radio band. If required, the fault flag can be used as part of a circuit to drive an external P-FET to disconnect the input supply from the system in the event of a fault. The A8513 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pins, shorted boost switch or inductor, shorted ISET resistors, and IC over-temperature. A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads.