A8513 LED Driver

By Allegro MicroSystems, LLC 41

A8513 LED Driver

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.

Features
  • Wide input voltage range of 4.5 to 40 V for start/stop, cold crank and load dump requirements
  • Boost converter switching frequency up to 2 MHz, allowing operation above the AM band
  • Excellent input voltage transient response
  • Internal secondary OVP for redundant protection
  • Fully integrated LED current sink and boost converter with 60 VDC MOSFET
  • Maximum LED current of 150 mA
  • Drives up to 14 series LEDs
  • Single EN/PWM pin interface for PWM dimming and enable function
  • Fault flag pin to alert the controller to a myriad of possible fault conditions
  • Protection features:
    • Shorted output
    • Open or shorted LED pin
    • Output under-voltage and over-voltage
    • Input under-voltage
    • Shorted boost switch or inductor
    • Shorted ISET resistor
    • Open boost Schottky
    • Over-temperature
Applications
  • LCD backlighting for:
    • Automotive infotainment
    • Automotive cluster
    • Automotive center stack
    • Industrial LCD displays
    • Portable DVD players
  • LED lighting
  • Flatbed scanners

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