Product details


Vin (Min) (V) 9.2 Vin (Max) (V) 57 PoE current limit (Min) (mA) 850 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 450 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W DC/DC control PD and DC/DC Fault response Auto Retry Features Primary Side Adapter Priority, Thermal Shutdown, VFO Switching frequency Programmable open-in-new Find other Powered devices

Package | Pins | Size

HTSSOP (PWP) 16 32 mm² 5 x 6.4 open-in-new Find other Powered devices


  • IEEE 802.3at Classification With Status Flag
  • High Efficiency Solutions Over Wide Load Range
  • Powers Up to 25.5 W PDs
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Synchronous Rectifier Disable Signal
  • PowerPAD™ TSSOP Packages
  • Complete PoE Interface Plus DC-DC Controller
  • Adapter ORing Support
  • Programmable Frequency
  • TPS23752 Supports Ultra-Low Power Sleep Modes
  • –40°C to 125°C Junction Temperature Range
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The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE) powered device (PD) interface and a current-mode DC-DC controller optimized specifically for applications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass MOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source, current-mode control with slope compensation, blanking, and current limiting. Efficiency is enhanced at light loads by disabling synchronous rectification and entering variable frequency operation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep Mode feature. Sleep Mode disables the converter to minimize power consumption while still generating the Maintain Power Signature (MPS) required by IEEE802.3at.

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Technical documentation

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Type Title Date
* Data sheet TPS2375x IEEE 802.3at PoE Interface With Flyback DC-DC Controller datasheet (Rev. E) Jan. 26, 2018
Application note PoE Powered Devices Debug Guidelines Jul. 19, 2021
Application note PoE PD Schematic Review Guidelines Apr. 29, 2021
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article Maximizing PoE PD efficiency on a budget Nov. 10, 2015
Application note Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
User guide TPS23751EVM-104 EVM: Evaluation Module for TPS23751 (Rev. A) Nov. 02, 2012
Technical article Watch your Power over Ethernet OPEX or risk obsolescence! Oct. 09, 2012
Application note High Efficiency Class 4 PoE Powered Device Mar. 23, 2011
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb. 09, 2009
Application note Designing an EMI Compliant PoE with Isolated Flyback May 20, 2008

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

TPS23751 Evaluation Module
document-generic User guide
TPS23751EVM-104 contains evaluation and reference circuitry for the TPS23751, which is a Class 4 (25.5W) PoE PD + PWM Controller. The TPS23751 is targeted at flyback only applications and is compliant with the IEEE 802.3at Power over Ethernet (PoE) standard. This EVM contains input & output (...)
  • Powers up to 25.5 W PDs
  • Robust 100 V, 0.5 ohm hotswap MOSFET
  • High efficiency and Eco-mode™
  • Synchronous rectifier disable signal
  • PowerPad™ TSSOP packages
  • IEEE 802.3at classification with status flag
  • Complete PoE interface plus DC/DC controller
  • Adapter ORing support
  • Programmable frequency

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLUC480.ZIP (452 KB)

Reference designs

Class 4 high efficiency PoE flyback-synchronous converter (5V/3A) reference design
PMP20220 — This reference design utilizes the TPS23751 combination PoE PD controller and PWM controller, saving cost and size.  The synchronous flyback converter provides high efficiency for PoE applications such as wireless access points and IP phones.  The PoE PD can also supply up to 10W of (...)
document-generic Schematic
Class 4 PoE Flyback Converter (12V@2.125A) Reference Design
PMP11254 — The flyback topology with diode rectification provides a low cost solution for Class 4 PoE applications.  The TPS23751 is a combination PoE PD controller and PWM controller, saving cost and space.  This converter is well suited for PoE applications such as security cameras and wireless access points.
document-generic Schematic
Class 4 High-Efficiency Driven Flyback Converter (5V/5A) for PoE PD Applications Reference Design
TIDA-00617 The TIDA-00617 reference design uses the TPS23751 PoE PD controller in a high effciency (driven) synch flyback converter capable of 5V at 5A.
document-generic Schematic

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 16 View options

Ordering & quality

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