Texas Instruments TPS23882B Type-3 Two-Pair PSE Controller

Texas Instruments TPS23882B Type-3 Two-Pair PSE Controller is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables per the IEEE 802.3bt standard. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power. The TPS23882B improves on the TPS2388 with reduced current sense resistors, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI’s FirmPSE system firmware.

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 1.25A port current limit and adjustable power limiting allow for the support of non-standard applications above 60W sourced. The 200mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal, and solution cost requirements.

Port remapping and pin-to-pin compatibility, with the Texas Instruments TPS2388, TPS23880, and TPS23881 devices, ease migration from previous generation PSE designs. It also enables interchangeable 2-layer PCB designs to accommodate different system PoE power configurations.

Features

IEEE 802.3bt PSE solution for PoE 2 Type-3 2-pair power over ethernet applications
Compatible with TI’s FirmPSE system firmware
SRAM programmable memory
Programmable power limiting accuracy ±4%
200mΩ current sense resistor
User-selectable 15W or 30W autonomous mode with no MCU required
Selectable 2-pair port power allocations
- 4W, 7W, 15.4W, or 30W
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
Never Fooled 4-point detection
Inrush and operational foldback protection
425mA and 1.25A selectable current limits
Port re-mapping
8-bit or 16-bit I²C communication
Flexible processor-controlled operating modes
- Auto, semi-auto, and manual/diagnostic
Per-port voltage monitoring and telemetry
–40°C to +125°C temperature operation