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

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TPS2373-3RGWT General Description

The TPS2373 contains all of the features needed to implement an IEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switch resistance allows the TPS2373-4 and TPS2373-3 to support high power applications up to 90 W and 60 W respectively. Assuming 100-meter CAT5 cable, this translates 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) startup requirements 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 PWM controller.

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

Texas Instruments, Inc Inventory

Key Features

  • 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 Current Limit
    • 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 Standby Modes
  • Primary Adapter Priority Input
  • Supports PoE++ PSE
  • -40°C to 125°C Junction Temperature Range
  • 20-lead VQFN Package
Texas Instruments, Inc Original Stock
Texas Instruments, Inc Inventory


Category Integrated Circuits (ICs)Power Management (PMIC)Power Over Ethernet (PoE) Controllers Mfr Texas Instruments
Series - Package Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status Active Type Controller (PD)
Number of Channels 1 Power - Max 60 W
Internal Switch(s) Yes Auxiliary Sense Yes
Standards 802.3at (PoE+), 802.3bt Voltage - Supply 0V ~ 57V
Current - Supply 20mA Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount Package / Case 20-VQFN Exposed Pad
Supplier Device Package 20-VQFN (5x5)

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