TPS2373 IEEE 802.3bt PoE high-power PD interface with advanced startup | TI.com

TPS2373 (ACTIVE) IEEE 802.3bt PoE high-power PD interface with advanced startup

 

Special note

In need of an IEEE802.3bt-ready PSE controller? Check out the  TPS23881.

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.

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

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) PoE current limit (Min) (mA) PoE inrush limit (Typ) (mA) rDS(on) per FET (Typ) (mOhms) PoE standards supported PD power level DC/DC control Fault response Features Package Group Package size: mm2:W x L (PKG)
TPS2373 Order now 8     57     1550
1900    
200mA Typ
335mA Typ    
300
100    
802.3bt Type 3
802.3bt Type 4    
13W
25W
51W
71W    
PD Only     Auto Retry     Adapter priority
Advanced startup
Automatic MPS
Non-standard POE++ compatible
PG
Primary Side Adapter Priority
Programmable UVLO
Thermal Shutdown    
VQFN | 20     20VQFN: 25 mm2: 5 x 5 (VQFN | 20)    
TPS2372 Order now 8     57     1550
1900    
200mA Typ
335mA Typ    
100
300    
802.3bt Type 3
802.3bt Type 4    
13W
25W
51W
71W    
PD Only     Auto Retry     Autoclass
Automatic MPS
Inrush delay
Non-standard POE++ compatible
PG
Thermal Shutdown    
VQFN | 20     20VQFN: 25 mm2: 5 x 5 (VQFN | 20)