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IEEE 802.3bt PoE high-power PD interface with advanced startup


Package | PIN: VQFN (RGW) | 20
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $3.18
10-24 $2.87
25-99 $2.67
100-249 $2.34
250-499 $2.19
500-749 $1.86
750-999 $1.57
1000+ $1.50


  • IEEE 802.3bt (Draft) PD Solution for Type 3 or Type 4 PoE
  • Supports Power Levels for Type-4 (TPS2373-4) 90-W and Type-3 (TPS2373-3) 60-W Operation
  • Robust 100 V Hotswap MOSFET
    • TPS2373-4 (typ.): 0.1-Ω, 2.2-A CurrentLimit
    • TPS2373-3 (typ.): 0.3-Ω, 1.85-A Current Limit
  • Allocated Power Indicator Outputs
  • Advanced Startup for DC-DC
    • Simplifies Downstream DC-DC Design
    • Compliant to PSE Inrush
  • Automatic Maintain Power Signature (MPS)
    • Auto-adjust MPS for Type 1-2 or 3-4 PSE
    • Supports Ultra-Low Power StandbyModes
  • Primary Adapter Priority Input
  • Supports PoE++ PSE
  • -40°C to 125°C Junction Temperature Range
  • 20-lead VQFN Package

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Texas Instruments  TPS2373-4RGWR

The TPS2373 contains all of the features needed to implement anIEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switchresistance allows the TPS2373-4 and TPS2373-3 to supporthigh power applications up to 90 W and 60 W respectively. Assuming 100-meter CAT5 cable, thistranslates into 71.3 W and 51 W at PD input.

The TPS2373 operates with enhanced features.

The Advanced Startup function for DC-DC results in a simple,flexible, and minimal system cost solution, while ensuring that IEEE802.3bt (draft) startuprequirements are met. It helps to reduce the size of the low voltage bias capacitor considerably.It also allows long DC-DC converter soft-start period and enables the use of a low-voltage PWMcontroller.

The Automatic MPS function enables applications requiring very low power standby modes.The TPS2373 automatically generates the necessary pulsed current to maintainthe PSE power. An external resistor is used to enable this functionality and to program the MPSpulsed current amplitude.