SLVSCE9D June   2014  – October  2017 TPS25942A , TPS25942L , TPS25944A , TPS25944L

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Enable and Adjusting Undervoltage Lockout
      2. 9.3.2  Overvoltage Protection (OVP)
      3. 9.3.3  Hot Plug-In and In-Rush Current Control
      4. 9.3.4  Overload and Short Circuit Protection
        1. 9.3.4.1 Overload Protection
        2. 9.3.4.2 Short Circuit Protection
        3. 9.3.4.3 Start-Up With Short on Output
        4. 9.3.4.4 Constant Current Limit Behavior During Overcurrent Faults
      5. 9.3.5  Reverse Current Protection
      6. 9.3.6  FAULT Response
      7. 9.3.7  Current Monitoring
      8. 9.3.8  Power Good Comparator
      9. 9.3.9  IN, OUT and GND Pins
      10. 9.3.10 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Diode Mode
      2. 9.4.2 Shutdown Control
      3. 9.4.3 Operational Differences Between the TPS25942 and TPS25944
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Step by Step Design Procedure
        2. 10.2.2.2 Programming the Current-Limit Threshold: R(ILIM) Selection
        3. 10.2.2.3 Undervoltage Lockout and Overvoltage Set Point
        4. 10.2.2.4 Programming Current Monitoring Resistor—RIMON
        5. 10.2.2.5 Setting Output Voltage Ramp Time (tdVdT)
          1. 10.2.2.5.1 Case1: Start-Up Without Load: Only Output Capacitance C(OUT) Draws Current During Start-Up
          2. 10.2.2.5.2 Case 2: Start-Up With Load: Output Capacitance C(OUT) and Load Draws Current During Start-Up
        6. 10.2.2.6 Programing the Power Good Set Point
        7. 10.2.2.7 Support Component Selections—R6, R7 and CIN
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Active ORing (Auto-Power Multiplexer) Operation
        1. 10.3.1.1 N+1 Power Supply Operation
        2. 10.3.1.2 Priority Power MUX Operation
        3. 10.3.1.3 Priority MUXing With Almost Equal Rails (VIN1 ~ VIN2)
        4. 10.3.1.4 Reverse Polarity Protection
  11. 11Power Supply Recommendations
    1. 11.1 Transient Protection
    2. 11.2 Output Short-Circuit Measurements
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Related Links
    4. 13.4 Receiving Notification of Documentation Updates
    5. 13.5 Community Resources
    6. 13.6 Trademarks
    7. 13.7 Electrostatic Discharge Caution
    8. 13.8 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10.2.3 Application Curves

TPS25942A TPS25942L TPS25944A TPS25944L Hot_Plug_StartUp_Output_Ramp_With_NoLoad.pngFigure 61. Hot-Plug Start-Up: Output Ramp Without Load on Output
TPS25942A TPS25942L TPS25944A TPS25944L Hot-Plug Start-Up_Output Ramp With 4.8Ohm.pngFigure 62. Hot-Plug Start-Up: Output Ramp With Start-Up load of 4.8 Ω
TPS25942A TPS25942L TPS25944A TPS25944L OverVoltage_Shutdown.pngFigure 63. Overvoltage Shutdown
TPS25942A TPS25942L TPS25944A TPS25944L Scope62_slvsce9.gifFigure 65. Over Load: Step Change in Load From 12 Ω to 2 Ω and Back
TPS25942A TPS25942L TPS25944A TPS25944L Hot_Short_Fasttrip_response_Current_Regulation.pngFigure 67. Hot Short: Fast Trip and Current Regulation
TPS25942A TPS25942L TPS25944A TPS25944L Recovery_From_Short_Circuit.pngFigure 69. Hot Short: Auto-Retry and Recovery from Short Circuit—TPS25942A
TPS25942A TPS25942L TPS25944A TPS25944L StartUp_Output_Short_AutoRetry_Behavior.pngFigure 71. Hot Plug-In With Short on Output: Auto-Retry—TPS25942A
TPS25942A TPS25942L TPS25944A TPS25944L Power_Good_Response_Turn_OFF.pngFigure 73. Power Good Response During Turnoff
TPS25942A TPS25942L TPS25944A TPS25944L OverVoltage_Recovery.pngFigure 64. Overvoltage Recovery
TPS25942A TPS25942L TPS25944A TPS25944L Scope63_slvsce9.gifFigure 66. Overload Condition: Auto Retry and Recovery—TPS25942A
TPS25942A TPS25942L TPS25944A TPS25944L Short_Circuit_Latch.pngFigure 68. Hot Short: Latched—TPS25942L
TPS25942A TPS25942L TPS25944A TPS25944L Hot_Plugin_with_Short_on_Output.pngFigure 70. Hot Plug-In with Short on Output: Latched—TPS25942L
TPS25942A TPS25942L TPS25944A TPS25944L Power_Good_Response_Turn_ON.pngFigure 72. Power Good Response During Turnon