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TPS2378

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IEEE 802.3at PoE High-Power PD interface with AUX Control

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Data sheet

TPS2378

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 0 Vin (Max) (V) 57 PoE current limit (Min) (mA) 850 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 420 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W DC/DC control PD Only Fault response Auto Retry Features PG, Primary Side Adapter Priority, Thermal Shutdown
Vin (Min) (V) 0 Vin (Max) (V) 57 PoE current limit (Min) (mA) 850 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 420 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W DC/DC control PD Only Fault response Auto Retry Features PG, Primary Side Adapter Priority, Thermal Shutdown
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HSOIC (DDA) 8 19 mm² 4.9 x 3.9
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  • IEEE 802.3at Type-2 Hardware Classification with Status Flag
  • Adapter Priority Input
  • DC/DC Converter Enable
  • Robust 100 V, 0.5-Ω Hotswap MOSFET
  • Operating Current up to 850 mA
  • 1-A (Typical) Operating Current Limit
  • 15 kV and 8 kV System-level ESD Capability
  • PowerPAD HSOP Package

All trademarks are the property of their respective owners.

  • IEEE 802.3at Type-2 Hardware Classification with Status Flag
  • Adapter Priority Input
  • DC/DC Converter Enable
  • Robust 100 V, 0.5-Ω Hotswap MOSFET
  • Operating Current up to 850 mA
  • 1-A (Typical) Operating Current Limit
  • 15 kV and 8 kV System-level ESD Capability
  • PowerPAD HSOP Package

All trademarks are the property of their respective owners.

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This 8-pin integrated circuit contains all of the features needed to implement an IEEE802.3at type-2 powered device (PD). The low 0.5-Ω internal switch resistance, combined with the enhanced thermal dissipation of the PowerPAD™ package, enables this controller to continuously handle up to 0.85 A. The TPS2378 features an auxiliary power detect (APD) input, providing priority for an external power adapter. It also features a 100-V pass transistor, 140-mA inrush current limiting, type-2 indication, auto-retry fault protection, and an open-drain power-good output.

This 8-pin integrated circuit contains all of the features needed to implement an IEEE802.3at type-2 powered device (PD). The low 0.5-Ω internal switch resistance, combined with the enhanced thermal dissipation of the PowerPAD™ package, enables this controller to continuously handle up to 0.85 A. The TPS2378 features an auxiliary power detect (APD) input, providing priority for an external power adapter. It also features a 100-V pass transistor, 140-mA inrush current limiting, type-2 indication, auto-retry fault protection, and an open-drain power-good output.

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TPS2379 ACTIVE IEEE 802.3at PoE High-Power PD interface with external gate driver TPS2379 has auxiliary gate driver which enables non-standard high power.

Technical documentation

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Type Title Date
* Data sheet TPS2378 IEEE 802.3at PoE High-Power PD Interface datasheet (Rev. C) 23 Jul 2015
Application note PoE Powered Devices Debug Guidelines 19 Jul 2021
Application note PoE PD Schematic Review Guidelines 29 Apr 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
User guide TPS2378EVM-602 Evaluation Module User's Guide (Rev. A) 31 Jul 2017
Application note Dual TPS2378 PD for 51-W High-Power Four-Pair PoE (Rev. A) 01 Jun 2016
Technical article May the forced UPOE be with you 15 Jun 2015
Application note Lightning Surge Considerations for PoE Powered Devices 30 Apr 2015
Technical article Simplifying higher current split-rail designs with Fly-Buck converters 05 Mar 2015
Technical article Watch your Power over Ethernet OPEX or risk obsolescence! 09 Oct 2012
User guide TPS2378EVM-105 User's Guide 20 Mar 2012
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) 09 Feb 2009

Design & development

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

Evaluation board

TPS2378EVM-105 — TPS2378 Evaluation Module

The Texas Instruments TPS2378EVM-105 evaluation module (EVM) helps designers evaluate the performance of the TPS2378 IEEE 802.3at PoE High-Power PD Interface with AUX Control. The EVM is designed to look like the front end of any Power Over Ethernet (PoE) PD module. An RJ-45 connector is provided (...)
document-pdfAcrobat User guide
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Evaluation board

TPS2378EVM-602 — Dual TPS2378 PoE PD for Forced UPOE 51W High Power Four-Pair PoE Applications Evaluation Module

The TPS2378EVM-602 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the dual TPS2378 four-pair, high power 51W applications. The TPS2378EVM-602 is a Forced UPOE compliant solution that requires no software. The EVM contains header connectors for easy connection to (...)

document-pdfAcrobat User guide
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Limit: 5
Simulation model

TPS2378 Unencrypted PSpice Transient Model Package (Rev. A)

SLVM991A.ZIP (114 KB) - PSpice Model
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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 (...)
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Calculation tool

PoE PD Efficiency Calculator

SLUC480.ZIP (452 KB)
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Reference designs

PMP10812 — Class 2 Non-isolated PoE Buck Converter (5V/1A) Reference Design

The PMP10812 reference design is ideal for Class 2 PoE PD applications that do not require isolation.  The TPS2378 PD controller provides the interface to the PSE.  The LM5010 buck converter has an integrated high side FET and external low side diode rectifier for low cost.
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Reference designs

PMP11257 — Class 4 PoE Synchronous Buck Converter (12V/2A) Reference Design

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 (...)
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Reference designs

TIDA-00741 — Non-Standard PoE, UPOE High-Efficiency Flyback Converter Reference Design for PoE PD Applications

TIDA-00741 uses two TPS2378 PD controllers for a forced 4-pair UPOE solution to 51W non-standard PoE PD applications. It incorportates the UCC2897A controller in a high-efficiency, great transient response (driven) synch flyback converter capble of 12V at 3.8A.
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Reference designs

PMP9676 — Class 1 Non-isolated Buck Converter (5V/560mA) for PoE PD Applications Reference Design

This converter is used for Class 1 PoE PD applications where isolation is not required.  The TPS2378 PD controller plus LM5006 buck converter provide 5V/560mA with good efficieny in a small size.  The LM5006 can be configured with a diode rectifier for lowest cost or a synchronous FET (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-00539 — UPOE High-Efficiency Flyback Converter (19V/2.3A) for Forced 4-Pair PoE PD Apps Reference Design

TIDA-00539 uses two TPS2378 PD controllers for a forced 4-pair UPOE solution to 51W non-standard PoE PD applications. It incorportates the UCC2897A controller in a high-efficiency, great transient response (driven) synch flyback converter capble of 19V at 2.3A.
document-pdfAcrobat Schematic
Reference designs

PMP10572 — Class 3 Isolated Fly-Buck Power Module for PoE Application Reference Design

The PMP10572 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed with TPS2378(PD controller) to provide 40V-57V input votlage and 12V 1SA output power. The design features the LM5160A (...)
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