SLUSC25B February   2015  – October 2026 TPS2388

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
    1. 4.1 Detailed Pin Description
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Timing Diagrams
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Port Remapping
      2. 7.3.2 Port Power Priority
      3. 7.3.3 A/D Converter
      4. 7.3.4 I2C Watchdog
      5. 7.3.5 Foldback Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Port Operating Modes
        1. 7.4.1.1 Semiauto
        2. 7.4.1.2 Manual
        3. 7.4.1.3 Power Off
      2. 7.4.2 Detection
      3. 7.4.3 Classification
      4. 7.4.4 DC Disconnect
    5. 7.5 Programming
      1. 7.5.1 I2C Serial Interface
    6. 7.6 Register Maps
      1. 7.6.1  Complete Register Set
      2. 7.6.2  INTERRUPT Register
      3. 7.6.3  INTERRUPT MASK Register
      4. 7.6.4  POWER EVENT Register
      5. 7.6.5  DETECTION EVENT Register
      6. 7.6.6  FAULT EVENT Register
      7. 7.6.7  START/ILIM EVENT Register
      8. 7.6.8  SUPPLY EVENT Register
      9. 7.6.9  PORT 1 STATUS Register
      10. 7.6.10 PORT 2 STATUS Register
      11. 7.6.11 PORT 3 STATUS Register
      12. 7.6.12 PORT 4 STATUS Register
      13. 7.6.13 POWER STATUS Register
      14. 7.6.14 Pin Status Register
      15. 7.6.15 OPERATING MODE Register
      16. 7.6.16 DISCONNECT ENABLE Register
      17. 7.6.17 DETECT/CLASS ENABLE Register
      18. 7.6.18 Port Power Priority/ICUT Disable Register Name
      19. 7.6.19 TIMING CONFIGURATION Register
      20. 7.6.20 GENERAL MASK Register
      21. 7.6.21 DETECT/CLASS RESTART Register
      22. 7.6.22 POWER ENABLE Register
      23. 7.6.23 RESET Register
      24. 7.6.24 ID Register
      25. 7.6.25 Police 21 Configuration Register
      26. 7.6.26 Police 43 Configuration Register
      27. 7.6.27 IEEE Power Enable Register
      28. 7.6.28 Power-on Fault Register
      29. 7.6.29 PORT RE-MAPPING Register
      30. 7.6.30 Port 21 Multi Bit Priority Register
      31. 7.6.31 Port 43 Multi Bit Priority Register
      32. 7.6.32 TEMPERATURE Register
      33. 7.6.33 INPUT VOLTAGE Register
      34. 7.6.34 PORT 1 CURRENT Register
      35. 7.6.35 PORT 2 CURRENT Register
      36. 7.6.36 PORT 3 CURRENT Register
      37. 7.6.37 PORT 4 CURRENT Register
      38. 7.6.38 PORT 1 VOLTAGE Register
      39. 7.6.39 PORT 2 VOLTAGE Register
      40. 7.6.40 PORT 3 VOLTAGE Register
      41. 7.6.41 PORT 4 VOLTAGE Register
      42. 7.6.42 PoE Plus Register
      43. 7.6.43 FIRMWARE REVISION
      44. 7.6.44 I2C WATCHDOG Register
      45. 7.6.45 DEVICE ID Register
      46. 7.6.46 PORT 1 DETECT RESISTANCE Register
      47. 7.6.47 PORT 2 DETECT RESISTANCE Register
      48. 7.6.48 PORT 3 DETECT RESISTANCE Register
      49. 7.6.49 PORT 4 DETECT RESISTANCE Register
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Introduction to PoE
      2. 8.1.2 TPS2388 Application
      3. 8.1.3 Kelvin Current Sensing Resistor
      4. 8.1.4 Connections on Unused Ports
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Power Pin Bypass Capacitors
        2. 8.2.2.2 Per Port Components
        3. 8.2.2.3 System Level Components (not shown in the schematic diagrams)
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 VDD
      2. 8.3.2 VPWR
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Port Current Kelvin Sensing
      2. 8.4.2 Layout Example
        1. 8.4.2.1 Component Placement and Routing Guidelines
          1. 8.4.2.1.1 Power Pin Bypass Capacitors
          2. 8.4.2.1.2 Per-Port Components
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.3 Application Curves

TPS2388 Startup With Valid PD (25kΩ and 0.1μF), Class 0
Figure 8-4 Startup With Valid PD (25kΩ and 0.1μF), Class 0
TPS2388 Detection With Invalid PD (15kΩ and 0.1μF)
Figure 8-6 Detection With Invalid PD (15kΩ and 0.1μF)
TPS2388 Detection With Invalid PD (25kΩ and 10μF)
Figure 8-8 Detection With Invalid PD (25kΩ and 10μF)
TPS2388 Powering Up into a 100μF Load
Figure 8-10 Powering Up into a 100μF Load
TPS2388 All Ports Fast Shutdown from OSS Input
Figure 8-12 All Ports Fast Shutdown from OSS Input
TPS2388 Overcurrent (ICUT) Timeout
Figure 8-14 Overcurrent (ICUT) Timeout
TPS2388 Rapid Response to a 1Ω Short - PoE+ Mode
Figure 8-16 Rapid Response to a 1Ω Short - PoE+ Mode
TPS2388 Response to a 25Ω Load - PoE+ Mode
Figure 8-18 Response to a 25Ω Load - PoE+ Mode
TPS2388 Current Limit 15ms Timeout - PoE+ Mode, 45Ω Load
Figure 8-20 Current Limit 15ms Timeout - PoE+ Mode, 45Ω Load
TPS2388 Current Limit Timeout Restart Delay
Figure 8-22 Current Limit Timeout Restart Delay
TPS2388 Detection With Open CircuitFigure 8-24 Detection With Open Circuit
TPS2388 2-Event Class and Port Turn OnFigure 8-26 2-Event Class and Port Turn On
TPS2388 Startup With Valid PD (25kΩ and 0.1μF), Class 3
Figure 8-5 Startup With Valid PD (25kΩ and 0.1μF), Class 3
TPS2388 Detection With Invalid PD (Open Circuit)
Figure 8-7 Detection With Invalid PD (Open Circuit)
TPS2388 2-Event Class and Startup With Valid PD
Figure 8-9 2-Event Class and Startup With Valid PD
TPS2388 All Ports Power-On With TPON Bit Set
Figure 8-11 All Ports Power-On With TPON Bit Set
TPS2388 Ports Fast Shutdown from 3-Bit OSS Input
Figure 8-13 Ports Fast Shutdown from 3-Bit OSS Input
TPS2388 Rapid Response to a 1Ω Short - 802.3af Mode
Figure 8-15 Rapid Response to a 1Ω Short - 802.3af Mode
TPS2388 Response to a 50Ω Load - 802.3af Mode
Figure 8-17 Response to a 50Ω Load - 802.3af Mode
TPS2388 Current Limit Timeout - 802.3af Mode, 85Ω Load
Figure 8-19 Current Limit Timeout - 802.3af Mode, 85Ω Load
TPS2388 Inrush Fault Timeout - 100Ω Load
Figure 8-21 Inrush Fault Timeout - 100Ω Load
TPS2388 Response to 8mA to 6mA Load, DC Disconnect Enabled
Figure 8-23 Response to 8mA to 6mA Load, DC Disconnect Enabled
TPS2388 Detection, 2-Event Class and Port Turn OnFigure 8-25 Detection, 2-Event Class and Port Turn On
TPS2388 2-Event Class and Port Turn OnFigure 8-27 2-Event Class and Port Turn On