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Diodes Pericom: A product line of Diodes Incorporated


The AL8843 is a hysteresis mode DC-DC step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device can operate from an input supply between 4.5V and 40V and provide an externally adjustable output current up to 3A. Depending upon supply voltage and external components, this converter can provide up to 60W of output power.

The AL8843 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 CTRL Pin. The CTRL 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 CTRL Pin to Ground. Applying a voltage of 0.3V or lower to the CTRL Pin will shut down the power switch.


  • LED Retrofit for Low Voltage Halogen 
  • Low Voltage Industrial Lighting
  • LED Backlighting
  • Illuminated Signs
  • External Driver with Multiple Channels


  • Wide Input Voltage Range: 4.5V to 40V
  • Output Current up to 3A
  • Internal 40V NDMOS Switch
  • Typical 4% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
  • Recommended Analog Dimming Range: 10% to 100%
  • Soft-Start
  • High Efficiency (Up to 97%)
  • LED Short Protection
  • Inherent Open-Circuit LED Protection
  • Over Temperature Protection (OTP)
  • Up to 1MHz Switching Frequency
  • SO-8EP Packages Available in Green Molding Compound (No Br, Sb)

Product Specifications

Product Parameters

Qualified to AECQ10x No
Automotive Compliant PPAP On Request*
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 3 A
LED Current Accuracy 4 %
Switching Frequency Maximum 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 95 %
Operating Temperature Range -40 to 105 °C
Sense Voltage 100 mV
AEC-Q100 Grade 1

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