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  • TPS23753A IEEE 802.3 PoE Interface and Converter Controller with Enhanced ESD Immunity

    • SLVS933D July   2009  – December 2020 TPS23753A

      PRODUCTION DATA  

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  • TPS23753A IEEE 802.3 PoE Interface and Converter Controller with Enhanced ESD Immunity
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Product Information
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: Controller Section Only
    6. 7.6 Electrical Characteristics: PoE and Control
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Pin Description
        1. 8.3.1.1  APD
        2. 8.3.1.2  BLNK
        3. 8.3.1.3  CLS
        4. 8.3.1.4  CS
        5. 8.3.1.5  CTL
        6. 8.3.1.6  DEN
        7. 8.3.1.7  FRS
        8. 8.3.1.8  GATE
        9. 8.3.1.9  RTN
        10. 8.3.1.10 VB
        11. 8.3.1.11 VC
        12. 8.3.1.12 VDD
        13. 8.3.1.13 VDD1
        14. 8.3.1.14 VSS
    4. 8.4 Device Functional Modes
      1. 8.4.1  Threshold Voltages
      2. 8.4.2  PoE Start-Up Sequence
      3. 8.4.3  Detection
      4. 8.4.4  Hardware Classification
      5. 8.4.5  Maintain Power Signature (MPS)
      6. 8.4.6  TPS23753A Operation
        1. 8.4.6.1 Start-Up and Converter Operation
        2. 8.4.6.2 PD Self-Protection
        3. 8.4.6.3 Converter Controller Features
      7. 8.4.7  Special Switching MOSFET Considerations
      8. 8.4.8  Thermal Considerations
      9. 8.4.9  FRS and Synchronization
      10. 8.4.10 Blanking – RBLNK
      11. 8.4.11 Current Slope Compensation
      12. 8.4.12 Adapter ORing
      13. 8.4.13 Protection
      14. 8.4.14 Frequency Dithering for Conducted Emissions Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Support Resources
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • PW|14
    • MPDS360A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • slvs933d_oa
  • slvs933d_pm
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DATA SHEET

TPS23753A IEEE 802.3 PoE Interface and Converter Controller with Enhanced ESD Immunity

1 Features

  • Enhanced ESD ride-through capability
  • Optimized for isolated converters
  • Complete PoE interface
  • Adapter ORing support
  • 12-V adapter support
  • Programmable frequency with synchronization
  • Robust 100-V, 0.7-Ω hotswap MOSFET
  • Small 14-Pin TSSOP package
  • 15-kV and 8-kV system level ESD capable
  • –40°C to 125°C junction temperature range
  • Design procedure application note – SLVA305
  • Adapter oring application note – SLVA306

2 Applications

  • IEEE 802.3at compliant powered devices
  • VoIP telephones
  • Access points
  • Security cameras

3 Description

The TPS23753A is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-DC controller optimized specifically for isolated converter designs. The PoE implementation supports the IEEE 802.3at standard as a 13-W, type 1 PD. The requirements for an IEEE 802.3at type 1 device are a superset of IEEE 802.3-2008 (originally IEEE 802.3af).

The TPS23753A supports a number of input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The PoE interface features an external detection signature pin that can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off. Classification can be programmed to any of the defined types with a single resistor.

The DC-DC controller features a bootstrap start-up mechanism with an internal, switched current source. This provides the advantages of cycling overload fault protection without the constant power loss of a pullup resistor.

The programmable oscillator may be synchronized to a higher-frequency external timing reference. The TPS23753A features improvements for uninterrupted device operation through an ESD event.

Device Information(1)
PART NUMBERPACKAGEBODY SIZE (NOM)
TPS23753ATSSOP (14)5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
GUID-6A57E77D-0C0F-480B-8002-046B383280E5-low.gif Basic TPS23753A Implementation

4 Revision History

Changes from Revision C (April 2016) to Revision D (December 2020)

  • Updated the numbering format for tables, figures and cross-references throughout the documentGo
  • Changed Start-up time unit from "V" to "ms" in Electrical Characteristics: Controller Section Only tableGo

Changes from Revision B (January 2010) to Revision C (April 2016)

  • Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo
  • Deleted Dissipation Ratings Go

Changes from Revision A (September 2009) to Revision B (January 2010)

  • Changed From: IEEE 802.3-2005 To: IEEE 802.3at throughout the data sheetGo
  • Changed the text in paragraph one of the DESCRIPTIONGo
  • Changed the Thermal resistance note in the DISSIPATION RATINGS table to include additional informationGo
  • Changed text in the second paragraph of Classic PoE Overdrive From: The PD may return the default 12.95 W (often referred to as 13 W) current-encoded class, or one of four other choices. To: The PD may return the default 13-W current-encoded class, or one of four other choicesGo
  • Changed Table 8-1 - Notes for the Class 4 rowGo

Changes from Revision * (July 2009) to Revision A (September 2009)

  • Changed the ESDS statement.Go

5 Product Information

DEVICEDUTY CYCLEPOE UVLO
ON / HYST.		DC-DC UVLO
ON / HYST.
TPS23753A0 – 78%35/4.59/3.5

 
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