Product details


Vin (Min) (V) 8 Vin (Max) (V) 57 PoE current limit (Min) (mA) 1550, 1900 PoE inrush limit (Typ) (mA) 200mA Typ, 335mA Typ rDS(on) per FET (Typ) (mOhms) 300, 100 PoE standards supported 802.3bt Type 3, 802.3bt Type 4 PD power level 13W, 25W, 51W, 71W DC/DC control PD Only Fault response Auto Retry Features Adapter priority, Advanced startup, Automatic MPS, Non-standard POE++ compatible, PG, Primary Side Adapter Priority, Programmable UVLO, Thermal Shutdown open-in-new Find other Powered devices

Package | Pins | Size

VQFN (RGW) 20 25 mm² 5 x 5 open-in-new Find other Powered devices


  • IEEE 802.3bt (Draft) PD Solution for Type 3 or Type 4 PoE
  • Supports Power Levels for Type-4 ( TPS2373-4) 90-W and Type-3 ( TPS2373-3) 60-W Operation
  • Robust 100 V Hotswap MOSFET
    • TPS2373-4 (typ.): 0.1-Ω, 2.2-A Current Limit
    • TPS2373-3 (typ.): 0.3-Ω, 1.85-A Current Limit
  • Allocated Power Indicator Outputs
  • Advanced Startup for DC-DC
    • Simplifies Downstream DC-DC Design
    • Compliant to PSE Inrush
  • Automatic Maintain Power Signature (MPS)
    • Auto-adjust MPS for Type 1-2 or 3-4 PSE
    • Supports Ultra-Low Power Standby Modes
  • Primary Adapter Priority Input
  • Supports PoE++ PSE
  • -40°C to 125°C Junction Temperature Range
  • 20-lead VQFN Package

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open-in-new Find other Powered devices


The TPS2373 contains all of the features needed to implement an IEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switch resistance allows the TPS2373-4 and TPS2373-3 to support high power applications up to 90 W and 60 W respectively. Assuming 100-meter CAT5 cable, this translates into 71.3 W and 51 W at PD input.

The TPS2373 operates with enhanced features.

The Advanced Startup function for DC-DC results in a simple, flexible, and minimal system cost solution, while ensuring that IEEE802.3bt (draft) startup requirements are met. It helps to reduce the size of the low voltage bias capacitor considerably. It also allows long DC-DC converter soft-start period and enables the use of a low-voltage PWM controller.

The Automatic MPS function enables applications requiring very low power standby modes. The TPS2373 automatically generates the necessary pulsed current to maintain the PSE power. An external resistor is used to enable this functionality and to program the MPS pulsed current amplitude.

open-in-new Find other Powered devices
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Technical documentation

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Type Title Date
* Data sheet TPS2373 High-Power PoE PD Interface with Advanced Startup datasheet (Rev. C) Nov. 07, 2018
Application note How to Identify Allocated Power at PD Through TPH, TPL, and BT Pins Jul. 21, 2020
Technical article The ABCs and 123s of PoE Apr. 17, 2020
Technical article Delivering a smooth transition from AC to PoE power Nov. 01, 2018
Technical article The new PoE standard: It’s almost here Jun. 06, 2018
Technical article Less (standby) power and more light May 10, 2018
Application note Beyond BT High-Power PoE Solution using the TPS23880 and TPS2372-4 Apr. 17, 2018
User guide TPS2373-4EVM-758 Evaluation Module (Rev. A) Jun. 19, 2017

Design & development

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

Hardware development

document-generic User guide

The TPS2373 evaluation module (TPS2373-4EVM-758) contains evaluation and reference circuitry for the TPS2373, which is a IEEE802.3bt PoE PD controller suitable for high power PoE PD applications. The EVM is designed with a 5V active clamp forward isolated converter for high efficiency, 70W PD (...)

  • IEEE802.3bt-ready PoE PD
  • 5V/14A High Efficiency Active Clamp Converter
  • Automatic MPS
  • Advanced Startup

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
  • (...)

Reference designs

Class 8 high power PoE isolated active clamp forward converter (24V/3A) reference design
PMP20878 — This reference design is a high power PoE Powered Device (PD) plus active clamp forward converter.  The TPS2373 high power PD controller EVM (TPS2373-4EVM-758) provides all functions necessary to implement an IEEE802.3bt-ready PD.  This is paired up with an active clamp forward converter (...)
document-generic Schematic document-generic User guide
Class 5 PoE PD (12 V/2.5 A) supply reference design with smooth transition to auxiliary
PMP21103 — This reference design implements an IEEE802.3bt compliant Class 5 Power over Ethernet (PoE) Powered Device (PD) with smooth transition between the PoE input and an auxiliary supply connected to the output.  The design consists of a 12-V/2.5-A active clamp forward converter utilizing the (...)
document-generic Schematic document-generic User guide
Type-3 IEEE802.3bt-ready flyback converter PoE powered device reference design
TIDA-050023 — This design showcases a low cost, Type-3, Class 6, 51W flyback converter for powered devices through Power over Ethernet. The TPS2373-3 PD controller provides detection and classification while also powering up the LM51551-Q1 PWM controller through its advanced startup feature. This design takes in (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RGW) 20 View options

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