TPS23861PWR Ethernet Switch IC POE / LAN Quad IEEE 802.3at PSE Controller

1 Features

• IEEE 802.3at Quad Port PSE Controller

• – Auto Detect, Classification

• – Auto Turn-On and Disconnect

• – Efficient 255-mΩ Sense Resistor

• Pin-Out Enables Two-Layer PCB

• Kelvin Current Sensing

• 4-Point Detection

• Automatic Mode – As Shipped

  • – No External Terminal Setting Required

  • – No Initial I2C Communication Required

• Semi-Automatic Mode – Set by I2C Command

  • – Continuous Identification and Classification

  • – Meets IEEE 400-ms TPON Specification

  • – Fast-Port Shutdown Input

  • – Operates best when used in conjunction with system reference code http://www.ti.com/product/TPS23861/toolssoftw are

2 Applications

• Ethernet Switches and Routers

• Surveillance NVR and DVRs

• Residential Gateways

• PoE Pass-Through Systems

• Wireless Backhaul

3 Description

The TPS23861 is an easy-to-use, flexible, IEEE802.3at PSE solution. As shipped, it automatically manages four 802.3at ports without the need for any external control.

The TPS23861 automatically detects Powered Devices (PDs) that have a valid signature, determines power requirements according to classification and applies power. Two-event classification is supported for type-2 PDs. The TPS23861 supports DC disconnection and the external FET architecture allows designers to balance size, efficiency and solution cost requirements.

The unique pin-out enables 2-layer PCB designs via logical grouping and clear upper and lower differentiation of I2C and power pins. This delivers best-in-class thermal performance, Kelvin accuracy and low-build cost.

In addition to automatic operation, the TPS23861 supports Semi-Auto Mode via I2C control for precision monitoring and intelligent power management. Compliance with the 400-ms TPON specification is ensured whether in semi-automatic or automatic mode.

Device Information