Diodes Incorporated

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Medium Voltage DC-DC LED Driver

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The AL8871Q is an LED driver, controller IC for driving external MOSFETs to drive high-current LEDs. The buck-boost topology controller enables it to efficiently control the current through series-connected LEDs. The 60V capability enables it to be used in a wide range of applications and drive in excess of 15 LEDs in series.

The AL8871Q is a modified hysteretic controller using a patent-pending control scheme providing high-output current accuracy. High-accuracy dimming is achieved through DC control and high-frequency PWM control.

The AL8871Q uses two pins for fault diagnosis. A flag output highlights a fault, while the multi-level status pin gives further information on the exact fault.

The AL8871Q has been qualified to AEC-Q100 Grade 1 and is automotive compliant supporting PPAPs.


• AEC-Q100 Grade 1 Qualified
• Wide Input Voltage Range: 5V to 60V
• Operating Frequency Up to 1MHz
• Analog Dimming Range: 10% to 100%
• 1000:1 PWM Dimming Resolution at 500 Hz
• High Temperature Control of LED Current Using TCTRL
• Fault Reporting for Abnormal Operations
• Overtemperature Shutdown
• Available in Thermally Enhanced TSSOP-16EP Package
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• PPAP Capable (Note 4)


• Automotive Daytime Running Lights
• Automotive Head Lamps
• Automotive Fog Lamps
• Automotive Interior Lamps

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topologies (Buck) No
Topologies (Buck-Boost) Yes
Topologies (Boost) No
Topologies (Charge Pump) No
Minimum Input Voltage (V) 5
Maximum Input Voltage (V) 60
Maximum Output Voltage (V) Ext MOSFET
Maximum LED Current (A) Ext MOSFET
LED Current Accuracy (%) 2
Switching Frequency Maximum (kHz) 1000
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 97
Operating Temperature Range (°C) -40 to 125
Sense Voltage (mV) 225
AEC-Q100 Grade 1

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