Diodes Incorporated

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The AL5817 is an 8-terminal adjustable linear LED driver-controller offering excellent temperature stability and output current capability. It works with a wide input voltage range from 4.5V to 60V. With an external LED driving power device, its internal power dissipation is minimized compared with traditional linear LED drivers. This makes it ideal for medium to high current LED circuits.

The AL5817 has internal output drive capability up to 15mA, which enables it to drive external Bipolar transistors or MOSFETs. It also provides the capability to drive longer LED chains with low drop out voltage and multiple LED channels.

The VSET pin is used to directly set output current feedback level. Using a resistor divider between REF pin and VSET pin, the output current can be set. Additionally, the use of an NTC resistor allows the creation of an accurate and configurable thermal fold-back behavior.

The AL5817 provides an LED-open detection feature through its VFAULT pin. If VFAULT is brought lower than 2.5V (by any one of the multiple LED channels going open) the AL5817’s output will go low turning off the external transistors. The device will recover when the open condition is removed. This ability of VFAULT to turn off the external transistors also allows PWM dimming of the LED current by adding PWM control signal on VFAULT pin.

An enable pin ENB is available to externally turn on and off the LEDs.

The AL5817 is available in the thermally enhanced MSOP-8EP package.


  • Wide Input Voltage Range from 4.5V to 60V
  • Configurable LED Current Setting
  • 4% Reference Voltage Tolerance 
  • Low Temperature Drift
  • 15mA Output Drive Capability for MOSFET or Bipolar Transistor
  • LED Open Protection Detected by VFAULT Pin
  • LED Thermal Fold-back Configured by VSET
  • Overtemperature Protection (OTP)
  • Input Under Voltage Lock-Out
  • PWM Dimming Realized Through VFAULT Pin or ENB Pin


  • Automotive Rear Combination Light
  • LED Signs
  • Instrumentation Illumination
  • Refrigerator Lights

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topology Linear Controller
Minimum Supply Voltage (V) 4.5 V
Maximum Supply Voltage (V) 60 V
Maximum VOUT (V) 60 V
Number of Channels 1
LED Current Sense Voltage (mV) 400 mV
Output Current (mA) 10 mA
Channel Max. Output Current (mA) EXT BJT mA
Accuracy (%) 4 %
Dimming Analog and PWM
Temperature Range (°C) -40 to 125 °C

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site