TPS23753 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Drop-in replacement with upgraded functionality to the compared device.
TPS23753A ACTIVE IEEE 802.3-2005 PoE interface and Isolated Converter controller with Enhanced ESD Ride-Through This product is integrated and more cost optimized for Type 1 PoE PD.

Product details

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  • Optimized for Isolated Converters
  • Complete PoE Interface
  • Adapter ORing Support
  • 12 V Adapter Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.7 Hotswap MOSFET
  • Small TSSOP 14 Package
  • 15 kV / 8 kV System Level ESD Capable
  • –40°C to 125°C Junction Temperature Range
  • Design Procedure Application Note - SLVA305
  • Adapter ORing Application Note - SLVA306
  • APPLICATIONS
    • IEEE 802.3at Compliant Powered Devices
    • VoIP Telephones
    • Access Points
    • Security Cameras
  • Optimized for Isolated Converters
  • Complete PoE Interface
  • Adapter ORing Support
  • 12 V Adapter Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.7 Hotswap MOSFET
  • Small TSSOP 14 Package
  • 15 kV / 8 kV System Level ESD Capable
  • –40°C to 125°C Junction Temperature Range
  • Design Procedure Application Note - SLVA305
  • Adapter ORing Application Note - SLVA306
  • APPLICATIONS
    • IEEE 802.3at Compliant Powered Devices
    • VoIP Telephones
    • Access Points
    • Security Cameras

The TPS23753 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converter designs. The PoE implementation supports the IEEE 802.3at standard as a 13 W, type 1 PD. The requirements for an IEEE 802.3at type 1 device are a superset of IEEE 802.3-2008 (originally 802.3af) requirements.

The TPS23753 supports a number of input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The PoE interface features an external detection signature pin that can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features a bootstrap startup mechanism with an internal, switched current source. This provides the advantages of cycling overload fault protection without the constant power loss of a pull up resistor.

The programmable oscillator may be synchronized to a higher-frequency external timing reference.

The TPS23753 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converter designs. The PoE implementation supports the IEEE 802.3at standard as a 13 W, type 1 PD. The requirements for an IEEE 802.3at type 1 device are a superset of IEEE 802.3-2008 (originally 802.3af) requirements.

The TPS23753 supports a number of input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The PoE interface features an external detection signature pin that can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features a bootstrap startup mechanism with an internal, switched current source. This provides the advantages of cycling overload fault protection without the constant power loss of a pull up resistor.

The programmable oscillator may be synchronized to a higher-frequency external timing reference.

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Technical documentation

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Type Title Date
* Data sheet IEEE 802.3 PoE Interface and Isolated Converter Controller datasheet (Rev. C) 04 Jan 2010
Technical article How to reduce the size of your 13-W PoE PD solution 25 Jun 2019
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 Designing with the TPS23753 Powered Device and Power Supply Controller (Rev. C) 10 Jan 2013
Application note Implementing a Buck Converter With the TPS23753A 20 Sep 2010
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) 09 Feb 2009
Application note PoE Powered Device for 24 VAC Building Power Applications 10 Sep 2008
Application note Designing an EMI Compliant PoE with Isolated Flyback 20 May 2008
Application note Practical Guidelines EMI Compliant PoE 27 Mar 2008

Design & development

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

Evaluation board

TPS23753AEVM-001 — 5Vout, 7W, IEEE 802.3-2005 Compliant, PD Controller, PS Controller EVM for TPS23753AEVM-001

The TPS23753AEVM-001 contains evaluation and reference circuitry for the TPS23753A, which is a Class 3 PoE PD + PWM Controller. It contains input and output power connectors and an array of onboard test points for circuit evaluation. The TPS23753AEVM-002 (3.3-V output) can be configured with simple (...)

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Evaluation board

TPS23753AEVM-004 — TPS23753AEVM-004 3.3Vout 10W IEEE 802.3-2005 Compliant PD Contr, PS Contr Evaluation Module

TPS23753AEVM-004 contains evaluation and reference circuitry for the TPS23753A, which is a Class 3 PoE PD + PWM Controller. It contains input and output power connectors and an array of onboard test points for circuit evaluation. The TPS23753AEVM-003 (5-V output) and TPS23753AEVM-005 (12-V output) (...)

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Limit: 5
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 (...)
Calculation tool

PoE PD Efficiency Calculator

SLUC480.ZIP (452 KB)
Reference designs

PMP5593 — Class 2 3.3V/1.8A Low Cost Flyback Converter for PoE PD Application Reference Design

low cost, isolated non synchronous PoE Flyback provides 3.3V @1.8A
Reference designs

PMP4648 — Class 3 Multi-Output Flyback Converter for PoE PD Application Reference Design

This PMP4648 is a multi-output power supply in a Power over Ethernet application. A 12V adapter input is connected in OR-ing to the 12V output.
Reference designs

PMP4507 — Class 3 Isolated Synchronous Flyback Converter (3V/3.3A) for PoE PD Applications Reference Design

This PMP4507 delivers 3.3V@3A or 5V@2A from a PoE source, standard 13W limit. The converter accepts also an external voltage from an adapter ranging 12V to 54V input.
Reference designs

PMP2735 — Class 3 Isolated Synchronous Flyback Converter (5V/2A) for PoE PD Applications Reference Design

This PMP2735 delivers 3.3V@3A or 5V@2A from a PoE source, standard 13W limit. The converter accepts also an external voltage from an adapter ranging 12V to 54V input.
Reference designs

PMP5595 — Class 3- PoE controller 12V@0.6A

This power supply replaces a small PoE module and delivers 12V @ 600mA. The board layout has been routed by separating the module into two parts: the input filter and bridge from the power stage.
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TSSOP (PW) 14 View options

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