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The AL8861Q is a hysteresis mode DC-DC step-down LED driver, designed for driving single or multiple series of the connected LEDs efficiently from a voltage source higher than the LED voltage. The device can operate with an input supply from 4.5V to 40V and provide an externally adjustable output current up to 1.5A for MSOP-8EP package. Depending upon supply voltage and external components, this converter can provide up to 40W of output power.

The AL8861Q integrates the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current.

Dimming can be realized by applying an external control signal to the VSET pin. The VSET pin will accept either a DC voltage signal or a PWM signal.

The soft-start time can be adjusted by an external capacitor from the VSET pin to the ground. Applying a voltage of 0.2V or lower to the VSET pin can turn off the output and make the device enter into standby state with low power consumption.


  • Automotive Interior LED Lamps
  • Automotive Exterior LED Lamps


  • Wide Input Voltage Range: 4.5V to 40V
  • Output Current up to 1.5A
  • Internal 40V NDMOS Switch
  • Typical 5% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
  • High Efficiency (>95%)
  • LED Short-Circuit Protection
  • Inherent Open-Circuit LED Protection
  • Sense Resistor Short-Circuit Protection
  • Over-Temperature Shutdown
  • Up to 1MHz Switching Frequency
  • Pb-Free MSOP-8EP Package

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Yes
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Minimum Input Voltage 4.5 V
Maximum Input Voltage 40 V
Maximum Output Voltage 36 V
Maximum LED Current 1.5 A
LED Current Accuracy 5 %
Switching Frequency Maximum 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 98 %
Operating Temperature Range -40 to 150 °C
Sense Voltage 100 mV
AEC-Q100 Grade 1

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AL8861QMP-13 Mouser Electronics Inc. 4965 7/7/2020 Buy Now United States
AL8861QMP-13 Avnet EU 5000 7/6/2020 Buy Now Germany
AL8861QMP-13 Digi-Key Electronics 4770 7/6/2020 Buy Now United States
AL8861QMP-13 Future Electronics 2500 7/6/2020 Buy Now Canada
AL8861QMP-13 Future Electronics - Asia 92500 7/6/2020 Singapore