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.