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 TIs
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
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.
200-mΩ current sense
resistor and external FET architecture allow designs to balance size, efficiency, thermal and
solution cost requirements.