TPS23881B Series
Type-4, four-pair, 8-channel PoE PSE controller with autonomous mode
Manufacturer: Texas Instruments
Catalog
Type-4, four-pair, 8-channel PoE PSE controller with autonomous mode
Key Features
• IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power over Ethernet applicationsEight independent PSE channelsResistor selectable Autonomous operationNo external MCU requiredCompatible with TI’sFirmPSEsystem firmwareSRAM Programmable memoryProgrammable power limiting accuracy ±2.5%200mΩ current sense resistorLegacy PD capacitance measurementSelectable 2-pair or 4-pair port power allocations15.4W, 30W, 45W, 60W, 75W or 90WSingle and dual signature PD compatibilityDedicated 14-bit integrating current ADC per portNoise immune MPS for DC disconnect2% current sensing accuracy1- or 3-bit fast port shutdown inputAuto-class discovery and power measurementInrush and operational foldback protectionFlexible processor controlled operating modesAuto, semi auto and manual / diagnosticPer port voltage monitoring and telemetry–40°C to +125°C temperature operationUltra Low Alpha (ULA) packaging (TPS23881A)IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power over Ethernet applicationsEight independent PSE channelsResistor selectable Autonomous operationNo external MCU requiredCompatible with TI’sFirmPSEsystem firmwareSRAM Programmable memoryProgrammable power limiting accuracy ±2.5%200mΩ current sense resistorLegacy PD capacitance measurementSelectable 2-pair or 4-pair port power allocations15.4W, 30W, 45W, 60W, 75W or 90WSingle and dual signature PD compatibilityDedicated 14-bit integrating current ADC per portNoise immune MPS for DC disconnect2% current sensing accuracy1- or 3-bit fast port shutdown inputAuto-class discovery and power measurementInrush and operational foldback protectionFlexible processor controlled operating modesAuto, semi auto and manual / diagnosticPer port voltage monitoring and telemetry–40°C to +125°C temperature operationUltra Low Alpha (ULA) packaging (TPS23881A)
Description
AI
The TPS23881B 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 TPS23881B improves on the TPS2388 with reduced current sense resistors, selectable Autonomous operation, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI’sFirmPSEsystem firmware (see Device Comparison Table).
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 TPS23881B 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 TPS23881B improves on the TPS2388 with reduced current sense resistors, selectable Autonomous operation, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI’sFirmPSEsystem firmware (see Device Comparison Table).
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.
