IEEE 802.3at PoE Interface and Green-mode DC/DC Controller - TPS23751

TPS23751 (ACTIVE)

IEEE 802.3at PoE Interface and Green-mode DC/DC Controller

 

Description

The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE) powered device (PD) interface and a current-mode DC-DC controller optimized specifically for applications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass MOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source, current-mode control with slope compensation, blanking, and current limiting. Efficiency is enhanced at light loads by disabling synchronous rectification and entering variable frequency operation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep Mode feature. Sleep Mode disables the converter to minimize power consumption while still generating the Maintain Power Signature (MPS) required by IEEE802.3at.

Features

  • IEEE 802.3at Classification With Status Flag
  • High Efficiency Solutions Over Wide Load Range
  • Powers Up to 25.5 W PDs
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Synchronous Rectifier Disable Signal
  • PowerPAD™ TSSOP Packages
  • Complete PoE Interface Plus DC-DC Controller
  • Adapter ORing Support
  • Programmable Frequency
  • TPS23752 Supports Ultra-Low Power Sleep
    Modes
  • –40°C to 125°C Junction Temperature Range

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Parametrics Compare all products in Powered Device

 
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
Special Features
Package Group
Package Size: mm2:W x L (PKG)
Approx. Price (US$)
Switching Frequency
Pin/Package
TPS23751 TPS23752 TPS23754 TPS23754-1 TPS23756
9.2    9.2    15.7    15.7    9.3   
57    57    57    57    57   
850    850    850    850    850   
140    140    140    140    140   
450    450    430    430    430   
802.3at Type 1 (802.3af)
802.3at Type 2   
802.3at Type 1 (802.3af)
802.3at Type 2   
802.3at Type 1 (802.3af)
802.3at Type 2   
802.3at Type 1 (802.3af)
802.3at Type 2   
802.3at Type 1 (802.3af)
802.3at Type 2   
25W    25W    25W    25W    25W   
PD and DC/DC    PD and DC/DC    PD and DC/DC    PD and DC/DC    PD and DC/DC   
Auto Retry    Auto Retry    Auto Retry    Auto Retry    Auto Retry   
Thermal Shutdown
VFO   
Sleep Mode
Thermal Shutdown
VFO   
Thermal Shutdown
Second Gate Drive   
Thermal Shutdown
Second Gate Drive   
Thermal Shutdown
Second Gate Drive   
HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP   
16HTSSOP: 32 mm2: 6.4 x 5(HTSSOP)    20HTSSOP: 42 mm2: 6.4 x 6.5(HTSSOP)    20HTSSOP: 42 mm2: 6.4 x 6.5(HTSSOP)    20HTSSOP: 42 mm2: 6.4 x 6.5(HTSSOP)    20HTSSOP: 42 mm2: 6.4 x 6.5(HTSSOP)   
1.10 | 1ku    1.10 | 1ku    1.25 | 1ku    1.25 | 1ku    1.30 | 1ku   
Programmable    Programmable    Programmable
Synchronizable   
Programmable
Synchronizable   
Programmable
Synchronizable   
16HTSSOP    20HTSSOP    20HTSSOP    20HTSSOP    20HTSSOP