Class 4 PoE Synchronous Buck Converter (12V/2A) Reference Design
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Key Document


The LM5116 synchronous buck controller provides a high efficiency solution for non-isolated PoE PD applications.  The TPS2378 PoE PD controller performs all necessary functions for an IEEE802.3at compliant Class 4 PoE PD.  This converter is ideal for any PoE application that demands best possible efficiency and does not require isolation.

  • Excellent efficiency (94% at 2A from PoE input)
  • Non-isolated
  • Small size

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)42.5
Vin (Max) (V)57
Vout (Nom) (V)12
Iout (Max) (A)2
Output Power (W)24
Input TypeDC
TopologyBuck- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17577Q3A  30V, N ch NexFET MOSFET™, single SON3x3, 6.4mOhm  MOSFETs  Sample & Buy Not Available
LM5116  6-100V Wide Vin, Current Mode Synchronous Buck Controller  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS2378  IEEE 802.3at PoE High-Power PD Interface with AUX Control  Power over Ethernet (PoE)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17577Q3A VSONP (DNH)| 8 Download Download
LM5116 Download
TPS2378 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 474 06 Sep 2016
Design files (4)
Title Type Size (KB) Date
ZIP 486 06 Sep 2016
PDF 186 06 Sep 2016
PDF 127 06 Sep 2016
PDF 393 06 Sep 2016

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