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TPS23881: Introduction of TPS23881

Part Number: TPS23881
Other Parts Discussed in Thread: TPS23880,

The TPS23881 is an 8-channel power supply equipment (PSE) controller designed to provide power to Ethernet cables according to the IEEE 802.3bt standard. These eight individual power channels can be configured as any combination of 2-pair (single-lane) or 4-pair (dual-lane) PoE ports. The PSE controller can detect power-supplying devices (PDs) with valid signatures, determine the power requirements of the devices based on their ratings, and supply power.

The TPS23881 improves upon the TPS23880 by reducing the current sense resistor, providing more accurate programmable power limiting, capacitance measurement, and the ability to run from ROM. The TPS23881 is also compatible with TI's FirmPSE system firmware, which provides a fully configurable solution for controlling multiple TPS23881 devices in a system that can provide up to 48 4-pair PoE power ports.

Dedicated ADCs for each port provide continuous port current monitoring and the ability to perform parallel classification measurements for shorter port turn-on times. Programmable port power limits with ±2.5% accuracy provide extended maximum power from 90W to over 125W. The 200mΩ current sense resistor and external FET architecture enable designs to balance size, efficiency, thermal and solution cost requirements.

• IEEE 802.3bt PSE solution for Type 3 or Type 4 Power over Ethernet applications

• Eight independent PSE channels

• Optional Resistor Autonomous Operation

   – No external MCU required
• Compatible with TI's FirmPSE system firmware

• SRAM programmable memory

• Programmable Power Limit Accuracy ±2.5%

• 200mΩ current sense resistor

• Conventional PD capacitance measurement

• Selectable 2-pair or 4-pair port power distribution

   – 15.4W, 30W, 45W, 60W, 75W or 90W
• Single-signature and dual-signature PD compatibility

• 14-bit integrating current ADC dedicated to each port

   – Noise-immune MPS for DC disconnect
   –2% Current Sensing Accuracy
• 1-bit or 3-bit fast port shutdown input

• Auto-class discovery and power measurement

• Surge and operating foldback protection

• Flexible processor-controlled operating modes

   – Automatic, semi-automatic and manual/diagnostic
• Per port voltage monitoring and telemetry

• –40°C to +125°C operating temperature

• Ultra Low Alpha (ULA) package (TPS23881A)

Editor: Perceptive-IC