450W High Efficiency 25V Buck Converter Reference Design
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Key Document


PMP20808 is a single-phase synchronous cuck converter reference design using the LM5117 controller IC. The design accepts an input voltage of 36Vin to 40Vin (38Vin Nominal) and provides an output of 25Vout capable of supplying 18A of continuous current to the load. The design was built on the PMP9280 PCB, which was modified to the PMP20808 design configuration and requirements. The PCB is a 4-layer board with 1oz copper on all layers.

  • Very high efficiency and high power
  • Small solution size for its voltage and power
  • Only single-phase operation
  • Optional current monitor output

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)40
Vout (Nom) (V)25
Iout (Max) (A)18
Output Power (W)450
Input TypeDC
TopologyBuck- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5117  5.5-65V Wide Vin, Current Mode Synchronous Buck Controller with Analog Current Monitor  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5117 Download Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 611 11 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 397 11 Dec 2017
ZIP 644 11 Dec 2017
PDF 746 11 Dec 2017
PDF 117 11 Dec 2017
PDF 34 11 Dec 2017
PDF 172 11 Dec 2017

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