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AL8861Q

High Efficiency 40V 1.5A Automotive Grade Buck LED Driver

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Description

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 the 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 (pulse-width modulation) 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.

The AL8861Q is qualified to AEC-Q100 Grade 1 and is automotive grade to support PPAPs. 

Feature(s)

  • 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
  • Overtemperature Shutdown
  • Up to 1MHz Switching Frequency
  • Pb-Free MSOP-8EP Package
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AL8861Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Application(s)

  • 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) 4.5
Maximum Input Voltage (V) 40
Maximum Output Voltage (V) 36
Maximum LED Current (A) 1.5
LED Current Accuracy (%) 5
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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TN1.pdf