New Industry Products

AEC-Q100 Grade 1, 60V/1.5A LED Controller

March 29, 2019 by Scott McMahan

Diodes Incorporated announced the availability of the AL5816Q, an automotive-compliant linear LED controller for automotive LED lighting. With an operating voltage range of 4.5V to 60V, the AL5816Q supplies an output drive current of 15mA to control LED lights through an external BJT, delivering a constant current of a few mA up to 1.5A, or higher LED current if a MOSFET is used.

This ability to optimize the external transistor makes the AL5816Q suited for many automotive LED lighting applications, such as rear light clusters, instrument panels, interior illumination, and license plate lighting.

Qualified to AEC-Q100 Grade 1, it supports PPAP documentation. The combination of a high input voltage and high-output drive current, coupled with a versatile high-voltage PWM dimming feature enables a significantly lower BOM for a wide range of automotive applications using the AL5816Q. The 5-pin SOT25 package requires few external components and does not need a separate switching inductor. It features a high-voltage PWM input for LED light dimming.

The feedback pin operates at just 200mV, enabling the AL5816Q to control the LED drive current precisely while minimizing the drop-out voltage and reducing the LED system power dissipation, particularly when compared against traditional linear LED controllers.

The high-output drive current lets the AL5816Q drive a single LED, an LED chain, or multiple LED channels, as needed by automotive manufacturers. The PWM dimming input accepts a signal operating at up to 50kHz. The device also features a number of protection features including input under-voltage lock-out and over-temperature shutdown.

Functional Block Diagram

It controls the regulation of LED current with minimum power dissipation compared with traditional linear LED drivers. This low power dissipation makes it suitable for medium to high current LEDs. PWM signal through PWM pin can dim AL5816Q, and it can run at frequencies higher than 200Hz.

The LED controller adjusts the LED current using a sense resistor connected across FB pin and GND. The voltage across this resistor is controlled to a precise 0.2V, thus controlling the current.


  • Qualified to AEC-Q100 Grade 1
  • Wide Input Voltage Range from 4.5V to 60V
  • Low Reference Voltage (VFB = 0.2V)
  • 5% Reference Voltage Tolerance
  • Up to 15mA Driver Capability for Bipolar Transistor
  • PWM Dimming Capable
  • Input Under Voltage Lock-out
  • Over Temperature Shutdown
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. "Green" Device
  • PPAP Capable

The AL5816Q is available in the SOT25 package and priced at $0.18 each in 1000 piece quantities.