IEEE 802.3at PoE High-Power PD Interface with AUX Control - TPS2378


IEEE 802.3at PoE High-Power PD Interface with AUX Control



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.


  • 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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Parametrics Compare all products in Powered Device

PD Power Level
Fault Response
PoE Current Limit (Min) (mA)
rDS(on) per FET (Typ) (mOhms)
Error Amplifier
PoE Inrush Limit (Typ) (mA)
PoE Standards Supported
Approx. Price (US$)
TPS2378 TPS2379
25W     25W
Auto Retry     Auto Retry    
802.3at type 1/ type 2     802.3at type 1/ type 2    
850     850    
420     420    
No     No    
140     140    
802.3at Type 1 (802.3af)
802.3at Type 2    
802.3at Type 1 (802.3af)
802.3at Type 2
Non Standard    
8SO PowerPAD     8SO PowerPAD    
0.65 | 1ku     1.00 | 1ku