The iW388 high-resolution integrated buck LED driver with Dialog’s True DC dimming technology enables high performance dimmable commercial lighting systems. The device works from a 65V input voltage as a second-stage converter in an AC/DC lighting system or as a stand-alone DC/DC converter. With an integrated 65V power MOSFET, the device offers a simple-to-use IC for applications up to 40W of output power. The iW388 accepts both analog (DC) or PWM dimming inputs to provide an exceptional dimming range from 0.0625% to 100% in 0.0625% steps with an integrated light-off mode. The device also works with a resistor set dimming input to offer a true 3-in-1 dimmer compatibility.

The iW388 supports a non-isolated buck converter topology to post-regulate from an off-line AC/DC converter, minimizing low frequency output ripple current and eliminating virtually all flicker in the system, even down to 1%.


  • Single-Stage DC/DC Non-Isolated Buck Regulator with Integrated Power MOSFET
  • Supports Wide DC Input Voltage with Tight Output Current Regulation (±3%)
  • Output Power up to 40W
  • Wide Output Voltage Range Support – 5V to 98% of the Input Voltage
  • High Performance Dimming
    • 0.0625% Dimming Resolution
    • 0.0625% to 100% Dimming Range
    • True DC Dimming with No Ripple Across Entire Dimming Range
    • Light-Off Mode - Completely Turn-Off LED Light at Minimum Dimming Input
  • Two DIM Pins – Supports PWM/Analog Inputs and RSET Input
    • RSET + 0-10V
    • MCU (DALI or Wireless) + 0-10V
  • Supports Constant Current (CC), Constant Voltage (CV), Constant Power (CP) Operating Modes
  • Fully Protected
    • Output Over-Voltage, Output Short, Over-Current, Peak Current Limit, Sense-Resistor Short Protection
    • Input Voltage Under-Voltage and Over-Voltage Protection
    • Built-In Over-Temperature Protection
  • Thermally Efficient SO-10 Batwing Package




  • Commercial Lighting:
    • Wireless and Intelligent LED Lighting Systems
    • DALI Lighting Systems
    • 0-10V Dimming
    • External Fixture Drivers


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Datasheet Log in to Download PDF 1.13 MB
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Design & Development