Home Power management Power over Ethernet (PoE) ICs Power sourcing equipment

TPS23881

ACTIVE

4-pair, type-4, 8-channel PoE PSE with 200-mΩ RSENSE 

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 Rating Catalog
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 Rating Catalog
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 I 2C 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 I 2C 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. E) PDF | HTML 16 May 2023
Application brief How to Load TPS2388x SRAM and Parity Code Over I2C (Rev. E) PDF | HTML 20 Apr 2023
Application brief Choosing PoE PSE System Software Solutions PDF | HTML 03 Aug 2021
Test report TPS23881 PoE2 Test Report 26 May 2020
Technical article The ABCs and 123s of PoE PDF | HTML 17 Apr 2020
Technical article Get more out of your power supply with port power management PDF | HTML 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
EVM User's guide TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module (Rev. A) 08 Aug 2019
EVM User's guide TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module 24 Apr 2019

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 (...)

Not available on TI.com
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 (...)

User guide: PDF
Not available on TI.com
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 (...)

Not available on TI.com
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.

User guide: PDF
Not available on TI.com
Code example or demo

SLVC771 TPS23881 PoE MSP430 Reference Code for Basic Application

Supported products & hardware

Supported products & hardware

Products
Power sourcing equipment
TPS23881 4-pair, type-4, 8-channel PoE PSE with 200-mΩ RSENSE 
Hardware development
Development kit
BOOST-PSEMTHR-007 TPS2388x motherboard for IEEE 802.3bt-ready PoE PSE applications
GUI for evaluation module (EVM)

SLVC772 TPS2388x EVM GUI

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Supported products & hardware

Supported products & hardware

Products
Power sourcing equipment
TPS23880 4-pair, type-4, 8-channel PoE PSE with programmable SRAM TPS23881 4-pair, type-4, 8-channel PoE PSE with 200-mΩ RSENSE  TPS23882 Type-3, 2-pair, 8-channel PoE PSE controller with SRAM and 200-mΩ RSENSE TPS23882B Type-3, two-pair, 8-channel PoE PSE controller with autonomous mode, SRAM and 200-mΩ RSENSE
Hardware development
Evaluation board
BOOST-PSEMTHR8-097 TPS23882 Type-3, 30W, 2-pair, PSE motherboard for 8-port PSE systems
Daughter card
TPS23880EVM-008 TPS23880 EVM daughter card for IEEE 802.3bt-ready PoE PSE applications TPS23881EVM-008 TPS23881 daughter card for IEEE 802.3bt ready PoE PSE applications TPS23882B1EVM-008 TPS23882B daughter card type-3, 30-W, two-pair, eight-port system PSE TPS23882EVM-008 TPS23882 Type-3, 30W, 2-pair, PSE daughter card for 8-port PSE systems
Development kit
BOOST-PSEMTHR-007 TPS2388x motherboard for IEEE 802.3bt-ready PoE PSE applications
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 (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
VQFN (RTQ) 56 View options

Ordering & quality

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Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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