Diodes Incorporated

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60V Buck LED Controller with Fault Flag

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The AL8863 is a step-down DC/DC controller designed to drive LEDs with high output current. The device operates at an input supply voltage from 4.5V to 60V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The switching frequency range of AL8863 is from 50KHz to 1MHz. The wide operating frequency range allows more flexibility on component selection, and also with operating up to 1MHz, it allows the use of smaller size external components, hence minimizing the PCB size and deriver board.

The output current of AL8863 is set via an external resistor connected between the VIN and CSN input pins. Dimming is achieved by applying a PWM signal at the DIM input pin. The soft-start time can be adjusted using an external capacitor from the DIM pin to ground.


  • Wide Input Voltage Range: 4.5V to 60V
  • Operating Frequency Range: 50KHz to 1MHz
  • 1000:1 PWM Dimming Resolution at 100Hz
  • Single Pin for On/Off and Brightness Control by PWM Signal


  • Commercial & industrial lighting
  • Architecture lighting
  • External LED drivers and smart lighting

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Topologies (Charge Pump) No
Minimum Input Voltage (V) 4.5
Maximum Input Voltage (V) 60
Maximum Output Voltage (V) Ext MOSFET
Maximum LED Current (A) Ext MOSFET
LED Current Accuracy (%) 5
Switching Frequency Maximum (kHz) 1000
Dimming (PWM) Yes
Dimming (Analog) No
Efficiency (%) 95
Operating Temperature Range (°C) -40 to 125
Sense Voltage (mV) 100
AEC-Q100 Grade No

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