6V - 18V Input Sync-Buck 0.5A LED Driver Reference Design
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Key Document


This LM20323 integrated FET sync-buck converter regulates the current in a white LED to 0.5A with minimum parts count. LED current is accurately measured with an INA193 and provides feedback to regulate the output current.

  • High switching frequency (520KHz) allows small size
  • Integrated controller allows low parts count
  • This design has been verified and includes a test report

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Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)6
Vin (Max) (V)18
Vout (Nom) (V)2.8
Iout (Max) (A).5
Output Power (W)1.4
Input TypeDC
TopologyBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA193  -16 to 80V, 500kHz current sense amplifier  Current sense amplifiers  Sample & Buy Not Available
LM20323  4.5-36V, 3A Current Mode Synchronous Buck Regulator  Step-down (buck) regulators  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA193 Download Download
LM20323 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1675 14 Apr 2016
Design files (6)
Title Type Size (KB) Date
PDF 47 14 Apr 2016
PDF 105 14 Apr 2016
PDF 122 14 Apr 2016
ZIP 392 14 Apr 2016
ZIP 22325 14 Apr 2016
PDF 5163 14 Apr 2016

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