1 Features

1• IEEE 802.3at Type-2 Hardware Classification with

Status Flag

• Adapter Priority Input

• DC/DC Converter Enable

• Robust 100 V, 0.5-Ω Hotswap MOSFET

• Operating Current up to 850 mA

• 1-A (Typical) Operating Current Limit

• 15 kV and 8 kV System-level ESD Capability

• PowerPAD™ HSOP Package

2 Applications

• IEEE 802.3at-compliant Devices

• Video and VoIP Telephones

• Multiband Access Points

• Security Cameras

• Pico-base Stations

• Forced, Four-Pair, High Power Devices

(SLVA625)

3 Description

This 8-pin integrated circuit contains all of the

features needed to implement an IEEE802.3at type-2

powered device (PD). The low 0.5-Ω internal switch

resistance, combined with the enhanced thermal

dissipation of the PowerPAD™ package, enables this

controller to continuously handle up to 0.85 A. The

TPS2378 features an auxiliary power detect (APD) input, providing priority for an external power adapter.

It also features a 100-V pass transistor, 140-mA

inrush current limiting, type-2 indication, auto-retry

fault protection, and an open-drain power-good output.