Product details

Vin (Min) (V) 44 Vin (Max) (V) 57 ILIM Programmable PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3, 802.3bt Type 4 FET External MPS method DC Disconnect Pair control 2-Pair Alt A, 4-Pair Operating temperature range (C) -40 to 125 Features Auto Mode, Current Limit with Foldback, Fast shutdown, Multi Level Port Priority, Over Current Reporting, Over Temp Reporting, Port remapping, Programmable PCUT, Programmable Port Power Limiting, SRAM Programmable Number of PSE ports 8
Vin (Min) (V) 44 Vin (Max) (V) 57 ILIM Programmable PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3, 802.3bt Type 4 FET External MPS method DC Disconnect Pair control 2-Pair Alt A, 4-Pair Operating temperature range (C) -40 to 125 Features Auto Mode, Current Limit with Foldback, Fast shutdown, Multi Level Port Priority, Over Current Reporting, Over Temp Reporting, Port remapping, Programmable PCUT, Programmable Port Power Limiting, SRAM Programmable Number of PSE ports 8
VQFN (RTQ) 56 64 mm² 8 x 8
  • IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power Over Ethernet applications
  • Eight independent PSE channels
  • Compatible with TI’s FirmPSE system firmware
  • SRAM Programmable memory
  • Programmable power limiting accuracy ±2.5%
  • 200-mΩ Current sense resistor
  • Legacy PD capacitance measurement
  • Selectable 2-pair or 4-pair port power allocations
    • 15.4 W, 30 W, 45 W, 60 W, 75 W or 90 W
  • Single and dual signature PD compatibility
  • Dedicated 14-bit integrating current ADC per port
    • Noise immune MPS for DC disconnect
    • 2% Current sensing accuracy
  • 1- or 3-Bit fast port shutdown input
  • Auto-class discovery and power measurement
  • Inrush and operational foldback protection
  • Flexible processor controlled operating modes
    • Auto, semi auto and manual / diagnostic
  • Per Port voltage monitoring and telemetry
  • –40°C to +125°C Temperature operation
  • Ultra Low Alpha (ULA) packaging (TPS23881A)
  • IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power Over Ethernet applications
  • Eight independent PSE channels
  • Compatible with TI’s FirmPSE system firmware
  • SRAM Programmable memory
  • Programmable power limiting accuracy ±2.5%
  • 200-mΩ Current sense resistor
  • Legacy PD capacitance measurement
  • Selectable 2-pair or 4-pair port power allocations
    • 15.4 W, 30 W, 45 W, 60 W, 75 W or 90 W
  • Single and dual signature PD compatibility
  • Dedicated 14-bit integrating current ADC per port
    • Noise immune MPS for DC disconnect
    • 2% Current sensing accuracy
  • 1- or 3-Bit fast port shutdown input
  • Auto-class discovery and power measurement
  • Inrush and operational foldback protection
  • Flexible processor controlled operating modes
    • Auto, semi auto and manual / diagnostic
  • Per Port voltage monitoring and telemetry
  • –40°C to +125°C Temperature operation
  • Ultra Low Alpha (ULA) packaging (TPS23881A)

The TPS23881 is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard.  The eight individual power channels can be configured in any combination of 2-Pair (1-channel) or 4-Pair (2-channels) PoE Ports. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power.

The TPS23881 improves on the TPS23880 with reduced current sense resistors, more accurate programmable power limiting, capacitance measurement and the ability to operate from ROM (see Device Comparison Table). The TPS23881 is also compatible with TI’s FirmPSE system firmware, which provides a fully configurable solution for controlling multiple TPS23881 devices in systems offering up to 48-ports of 4-pair PoE power.

Programmable SRAM enables in-field firmware upgradability over I2C to ensure IEEE compliance and interoperability with the latest PoE enabled devices. Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A ±2.5% accurate programmable port power limit provides the ability to expand the maximum power sourced from 90 W to upwards of 125 W. The 200-mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements. 

The TPS23881 is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard.  The eight individual power channels can be configured in any combination of 2-Pair (1-channel) or 4-Pair (2-channels) PoE Ports. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power.

The TPS23881 improves on the TPS23880 with reduced current sense resistors, more accurate programmable power limiting, capacitance measurement and the ability to operate from ROM (see Device Comparison Table). The TPS23881 is also compatible with TI’s FirmPSE system firmware, which provides a fully configurable solution for controlling multiple TPS23881 devices in systems offering up to 48-ports of 4-pair PoE power.

Programmable SRAM enables in-field firmware upgradability over I2C to ensure IEEE compliance and interoperability with the latest PoE enabled devices. Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A ±2.5% accurate programmable port power limit provides the ability to expand the maximum power sourced from 90 W to upwards of 125 W. The 200-mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements. 

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Technical documentation

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Type Title Date
* Data sheet TPS23881 Type-4 4-Pair 8-Channel PoE 2 PSE Controller with SRAM and 200 mΩ RSENSE datasheet (Rev. D) 28 May 2020
Test report 4s Battery Charger Solution For Vacuum Robot Reference Design 21 Dec 2021
Application note Choosing PoE PSE System Software Solutions 03 Aug 2021
Test report TPS23881 PoE2 Test Report 26 May 2020
Technical article The ABCs and 123s of PoE 17 Apr 2020
Technical article Get more out of your power supply with port power management 11 Nov 2019
Design guide 24-Port (4 Pair) Power Sourcing Equipment Reference Design for Multi-port Applic (Rev. A) 15 Oct 2019
Analog design journal Challenges and solutions for PoE systems in Ethernet switches 30 Sep 2019
Application note How to Load TPS2388x SRAM and Parity Code over I2C (Rev. C) 17 Sep 2019
User guide TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module (Rev. A) 08 Aug 2019
User guide TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module 24 Apr 2019
Technical article Mutual ID and its effect on backwards compatibility 07 Nov 2014
Technical article Simplify your PCB layout - When 2 is better than 6 19 Sep 2014

Design & development

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

Evaluation board

PSEMTHR24EVM-081 — Mother board for 24-port IEEE 802.3bt ready PSE system

PSEMTHR24EVM-081 is the base board for the TPS23881 and TPS23882 PSE controllers. This board contains 24 2-Pair / 4-Pair ports that can that can be used to send up to 30W/port for IEEE 802.3at applications and up to 90W/port for IEEE 802.3bt applications.

Daughter card

PSEMCUDAUEVM-082 — MCU daughter card for 24-port IEEE 802.3bt ready PSE system

PSEMCUDAUEVM-082 is the MSP430 MCU daughter card for TI's 24-port reference designs with the TPS23881 and TPS23882. This board combined with the GUI enables FirmPSE which is TI's production ready system firmware that can deliver system features such as port power management and the use of multiple (...)

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Daughter card

TPS23881EVM-008 — TPS23881 daughter card for IEEE 802.3bt ready PoE PSE applications

TPS23881EVM-008 is the daughter card to evaluate the TPS23881 which is a 4-pair, type-4, 8-channel Power-over-Ethernet (PoE) PSE with 200mΩ sense resistor. This daughter card provides evaluation and reference circuitry for the TPS23881 which is suitable for high power PSE applications such as (...)

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Daughter card

TPS23881EVM-083 — IEEE 802.3bt ready PSE daughter card for 24-port PSE system

TPS23881EVM-008 is a 24-port (48-channel) daughter card to evaluate the TPS23881 which is a 4-pair, type-4, 8-channel Power-over-Ethernet (PoE) PSE with 200mΩ sense resistor. This daughter card provides evaluation and reference circuitry for the TPS23881 in high port count applications such (...)

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Development kit

BOOST-PSEMTHR-007 — TPS2388x motherboard for IEEE 802.3bt-ready PoE PSE applications

BOOST-PSEMTHR-007 is the base board for the TPS23880 and TPS23881 PSE controllers. This board contains four 2-pair ports that can be used to send up to 30W/port for IEEE 802.3at applications and two 4-pair ports that can be used to send up to 90W/port for IEEE 802.3bt applications.

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GUI for evaluation module (EVM)

TPS2388x EVM GUI (Rev. C)

SLVC772C.ZIP (85101 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

TIDA-050026-23881 — 24-port (PoE 2, 4-pair) power sourcing equipment reference design for multi-port applications ;

This reference design showcases a Type-4 (PoE 2, 4-Pair) 24-port Ethernet switch for Power over Ethernet (PoE) applications which can send up to 90W per port for for IEEE 802.3bt (PoE 2) applications and up to 120W per port for non-standard applications. Based on the MSP430F523x family, our (...)
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