Wide Input Voltage, High-Efficiency LED Drivers with Four Current Sinks and PWM Dimming

A8519, A8519-1

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The A8519-1 offers a versatile solution for driving multiple LED strings, with four integrated current sinks, a boost converter, and PWM dimming for precise brightness control. The A8519-1 provides reduced output voltage ripple for enhanced dimming performance.

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Top Features

Packaging

  • Automotive AEC-Q100 qualified
  • Fully integrated 42 V MOSFET for boost converter
  • Fully integrated LED current sinks
  • Withstands surge input up to 40 VIN for load dump
  • Operates down to 3.9 VIN (max) for idle stop
  • Drives four strings of LEDs
  • Maximum output voltage 40 V
    • Up to 11 white LEDs in series
  • Drive current for each string is 100 mA
  • Programmable boost switching frequency (200 kHz to 2.15 MHz)
  • Synchronized boost switching frequency option (260 kHz to 2.3 MHz)
  • Dithering of boost switching frequency to reduce EMI
  • Extremely high LED contrast ratio
    • 10,000:1 using PWM dimming alone
    • 100,000:1 when combining PWM and analog dimming
  • Excellent input voltage transient response at lowest PWM duty cycle
  • Gate driver for optional P-channel MOSFET input disconnect switch
  • LED current accuracy 0.7%
  • LED string current matching accuracy 0.8%
  • Protection against:
    • ƒƒShorted boost switch, inductor or output capacitor
    • Shorted FSET or ISET resistor
    • Open or shorted LED pins and LED strings
    • Open boost diode
    • Overtemperature

20-pin TSSOP with exposed thermal pad (suffix LP)

28-pin QFN with exposed thermal pad (suffix ET)

 

Part Number Specifications and Availability