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TPS23755RJJR

PoE PD interface + DC-DC controller, 25.5W, VQFN-20

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Manufacturer Part：

TPS23755RJJR

Package：

VQFN-20 (3.5x3.5mm)

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Description

Product Overview

The TPS23755RJJR from TI is a PoE Powered Device interface with integrated DC-DC controller supporting IEEE 802.3at Type 2 up to 25.5W in VQFN-20.

Key Specifications

Package VQFN-20 (3.5×3.5mm)

Features

  • See datasheet for complete specifications
  • Industry-standard package

Applications

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management

The TPS23755RJJR from TI is a PoE Powered Device interface with integrated DC-DC controller supporting IEEE 802.3at Type 2 up to 25.5W in VQFN-20.

The TPS23755RJJR is a Powered Device (PD) controller for Power-over-Ethernet (PoE) systems compliant with IEEE 802.3at Type 1 (up to 25.5W). The PD detection sequence: when PSE applies 2.7-10.1V, the TPS23755 presents a 24.9kOhm signature resistance to identify itself as a valid PD. When the PSE raises voltage to 15.5-20.5V for classification, the device draws a specific current (set by VC1/VC2 resistors) to indicate its power requirement. After classification, the PSE ramps voltage to 48V, and the TPS23755 drives the GATE pin to turn on an external N-channel MOSFET, connecting the PoE input (VDD1-RTN) to the DC-DC converter input. An internal current limit protects against inrush current during hot-swap. The CTR pin provides a current-limit reference for the downstream DC-DC converter, and the PG pin signals when the output is valid.

Pin Name Type Function
1 VC1 Analog Classification current set resistor 1
2 VC2 Analog Classification current set resistor 2
3 RTN Power Return path (hot-swap MOSFET drain)
4 DEN Input Detect enable (pull to VSS for auto)
5 PG Output Power good indicator (open-drain)
6 CTL Input Control input for operating mode
7 CTR Output Current limit reference for DC-DC
8 VDD Power Internal supply bypass
9 VSS Power Ground reference
10 GATE Output Gate drive for external hot-swap MOSFET
11 VDD1 Power PoE input positive
12-20 NC/Pad – Thermal pad (connect to VSS)
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management
    • Manufacturer Part Number Package Notes
    Texas Instruments TPS2378PWP HTSSOP-20 Higher power PD, 25.5W
    Texas Instruments TPS23756RJJR VQFN-20 Similar with DC-DC controller
    Analog Devices LTC4267CGN SSOP-16 PoE PD with switching regulator
    onsemi NCP1083DPBG QFN-28 802.3at PoE PD, 51W
    Microchip PD70224-IQMN QFN-40 PoE PD controller, 90W
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    Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
     

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