Diodes Incorporated
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Automotive Grade, 55V Linear LED Driver

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The DIODES™ AL5871Q is an automotive-grade single channel linear LED driver with PWM and analog dimming control. The AL5871Q can drive up to 750mA and the LED current can be set by the low power reference resistor connected to the REF pin.

The AL5871Q regulates LED current accurate to ±4%, with excellent PWM and analog dimming performance. The AL5871Q enters standby mode to save power if no PWM signal is detected.

The AL5871Q monitors the temperature and reduces the LED current if the chip temperature exceeds the threshold temperature. And the input under voltage lock-out (UVLO), LED string open / short protection, and over temperature protection (OTP) are designed for automotive applications to improve system robustness. The FAULTB pin is pulled low if any protection is triggered.

The AL5871Q is a simple solution to deliver constant current for a single LED string with one fail all fail function, and can work with DIODES™ AL5873Q to address different requirements. The AL5871Q is available in TSSOP-16EP (Type DX) package.


  • Wide Input Voltage Range from 5V to 55V
  • Up to 750mA Output Current Capacity
  • Low Drop-out Voltage on LED Pin
  • Output Current Adjustable by a Low Power External Reference Resistor
  • PWM and Analog Dimming with Excellent Linearity
  • Automatically Enter and Exit Standby Mode Without Enable Pin
  • Internal Protections:
  • Input Under Voltage Lock-out (UVLO)
  • Enable LED String Open Protection
  • LED String Short Protection
  • Over Temperature Protection (OTP)
  • Diagnostic Enable with Adjustable Threshold for Low-Dropout Operation
  • Thermal Fold-Back if Chip Temperature Exceeds the Threshold
  • Fault Reporting: UVLO, OTP, LED Open, and LED Short
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AL5871Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities.



  • Automotive interior lighting: dome light, reading lamps
  • Automotive exterior lighting:
    • Small light: blind-spot detection indicators, charging inlets, door handles
    • Rear light: rear lamps, center high mounted stop lamps, side markers

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
Topology Linear LED Driver
Minimum Supply Voltage (V) 5 V
Maximum Supply Voltage (V) 55 V
Maximum VOUT (V) 55 V
Number of Channels 1
Output Current (mA) 750 mA
Channel Max. Output Current (mA) 750 mA
Accuracy (%) 4 %
Dimming Analog and PWM
Temperature Range (°C) -40 to 125 °C

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