TPS23881 High-power, 8-channel, power-over-ethernet PSE with 200mΩ RSENSE | TI.com

TPS23881 (ACTIVE) High-power, 8-channel, power-over-ethernet PSE with 200mΩ RSENSE

 

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Description

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, determine the power requirements of the devices according to their classification, 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.

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. 

Features

  • IEEE 802.3bt PSE solution for Type 3 or Type 4 PoE applications
  • Eight independent PSE channels
  • Resistor selectable Autonomous operation
    • No external MCU required
  • 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)

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) ILIM PoE standards supported FET MPS method Pair control Operating temperature range (C) Features Number of PSE ports Package Group Package size: mm2:W x L (PKG)
TPS23881 Order now 44     57     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2
802.3bt Type 3
802.3bt Type 4    
External     DC Disconnect     2-Pair Alt A
4-Pair    
-40 to 125     Auto Mode
Autonomous 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    
8     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)    
TPS23861 Order now 44     57     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2    
External     DC Disconnect     2-Pair Alt A     -40 to 125     Autonomous Mode
Current Limit with Foldback
Fast shutdown
Over Current Reporting
Over Temp Reporting
Programmable ICUT    
4     TSSOP | 28     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)    
TPS2388 Order now 44     57     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2    
External     DC Disconnect     2-Pair Alt A     -40 to 125     Current Limit with Foldback
Fast shutdown
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting
Port remapping
Programmable ICUT    
8     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)    
TPS23880 Order now 44     57     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2
802.3bt Type 3
802.3bt Type 4    
External     DC Disconnect     2-Pair Alt A
4-Pair    
-40 to 125     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    
8     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)    
TPS23882 Samples not available 44     57     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2
802.3bt Type 3    
External     DC Disconnect     2-Pair Alt A     -40 to 125     Auto Mode
Autonomous 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    
8     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)