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, Sleep Mode, Thermal Shutdown, VFO Switching frequency Programmable
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, Sleep Mode, Thermal Shutdown, VFO Switching frequency Programmable
HTSSOP (PWP) 20 42 mm² 6.5 x 6.4
  • 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
  • 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

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.

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) PDF | HTML 26 Jan 2018
Application note PoE Powered Devices Debug Guidelines PDF | HTML 19 Jul 2021
Application note PoE PD Schematic Review Guidelines PDF | HTML 29 Apr 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Maximizing PoE PD efficiency on a budget 10 Nov 2015
Application note Lightning Surge Considerations for PoE Powered Devices 30 Apr 2015
Application note TPS23752 Maintain Power Signature Operation in Sleep Mode 12 Apr 2013
Technical article Watch your Power over Ethernet OPEX or risk obsolescence! 09 Oct 2012
User guide TPS23752EVM-145 EVM: Evaluation Module for TPS23752 28 Jul 2012
Application note High Efficiency Class 4 PoE Powered Device 23 Mar 2011
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) 09 Feb 2009
Application note Designing an EMI Compliant PoE with Isolated Flyback 20 May 2008

Design & development

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

Evaluation board

TPS23752EVM-145 — TPS23752 Evaluation Module

The Texas Instruments TPS23752EVM-145 evaluation module (EVM) helps designers evaluate the performance of the TPS23752 IEEE 802.3at PoE Interface and Green-mode DC/DC Controller. The EVM contains input and output connectors as well as control jumpers to ease evaluation of device features.
User guide: PDF
Not available on TI.com
Calculation tool

PoE PD Efficiency Calculator

SLUC480.ZIP (452 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

PMP30290 — 18.5V to 57V Aux-Input to 5.3V, 10W PoE Isolated Sync-Flyback Reference Design

This compact reference design is a typical PoE application, supplying 10W at 5.3V from Ethernet power. Data filter, external auxiliary input and EMI filter are all on board. The synchronous rectification improves the efficiency, important at only 5.3V output voltage.
Test report: PDF
Schematic: PDF
Reference designs

PMP9013 — Class 4 Synchronous Flyback Converter (5V @ 4.5A) w/Sleep Mode for PoE Reference Design

The PMP9013 is an IEEE802.3at, Type 2 compliant, high-efficiency synchronous flyback converter (5V @4.5A) with sleep mode used for PD design in PoE applications. The reference design has the ability to allow an external adapter to supply power to the board if PoE power is not available.
Test report: PDF
Schematic: PDF
Reference designs

PMP8812 — Class 4- High Efficiency 12V Class 4 PoE Converter Reference Design

This design is a 12V/2.1A synchronous flyback converter for high efficiency PoE applications. The TPS23752 combines the Powered Device and PWM controllers in one package. Additional features are synchronous rectifier disable for improved light load efficiency and support for ulta low power sleep (...)
Test report: PDF
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HTSSOP (PWP) 20 View options

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