Diodes Incorporated

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The AL8862Q is a step-down DC/DC converter designed to drive LEDs with a constant current. The AL8862Q operates with an input supply voltage from 5V to 55V and provides an externally adjustable output current up to 1A. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8862Q switches at frequency up to 1MHz. This allows the use of smaller size external components, hence minimizing the PCB size.

The AL8862Q integrates the power switch and a high-side output current sensing circuit. The LED current of AL8862Q is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either a DC voltage or a PWM signal at the CTRL input pin. The soft-start time can be adjusted using an external capacitor from the CTRL pin to the ground. An input voltage of 0.3V or lower at CTRL pin will shut down the power switch.

The AL8862Q includes an open-drain fault output to indicate open circuit across LED string, short-circuit across current sense resistor and overtemperature conditions.

The AL8862Q is available in SO-8EP and V-DFN3030-8/SWP (Type A) packages.

The AL8862Q is qualified to AEC-Q100 Grade 1 and is automotive grade to support PPAPs.


  • Wide Input Voltage Range: 5V to 55V
  • Output Current up to 1A
  • Internal 55V NDMOS Switch
  • Typical 4% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
  • High Efficiency (Up to 97%)
  • Fault Status Indication for Abnormal Operation
  • LED Short-Circuit Protection
  • Inherent Open-Circuit LED Protection
  • Current-Sense Resistor Short-Circuit Protection
  • Overtemperature Shutdown
  • Up to 1MHz Switching Frequency
  • SO-8EP and V-DFN3030-8/SWP (Type A) Packages Available
  • in Green Molding Compound (No Br, Sb)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AL8862Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Automotive interior LED lamps
  • Automotive exterior LED lamps

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Topologies (Charge Pump) No
Minimum Input Voltage (V) 5
Maximum Input Voltage (V) 55
Maximum Output Voltage (V) 50
Maximum LED Current (A) 1
LED Current Accuracy (%) 4
Switching Frequency Maximum (kHz) 1000
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 98
Operating Temperature Range (°C) -40 to 125
Sense Voltage (mV) 100
AEC-Q100 Grade 1

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