• 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

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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.