SLVSCT5D March   2015  – September 2016 TPS22953 , TPS22954

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  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
    6. 7.6  Electrical Characteristics—VBIAS = 5 V
    7. 7.7  Electrical Characteristics—VBIAS = 3.3 V
    8. 7.8  Electrical Characteristics—VBIAS = 2.5 V
    9. 7.9  Switching Characteristics—CT = 1000 pF
    10. 7.10 Switching Characteristics—CT = 0 pF
    11. 7.11 Typical DC Characteristics
    12. 7.12 Typical Switching 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  On and Off Control (EN pin)
      2. 9.3.2  Voltage Monitoring (SNS Pin)
      3. 9.3.3  Power Good (PG Pin)
      4. 9.3.4  Supervisor Fault Detection and Automatic Restart
      5. 9.3.5  Manual Restart
      6. 9.3.6  Thermal Shutdown
      7. 9.3.7  Reverse Current Blocking (TPS22953 Only)
      8. 9.3.8  Quick Output Discharge (QOD) (TPS22954 Only)
      9. 9.3.9  VIN and VBIAS Voltage Range
      10. 9.3.10 Adjustable Rise Time (CT pin)
      11. 9.3.11 Power Sequencing
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Input to Output Voltage Drop
      2. 10.1.2 Thermal Considerations
      3. 10.1.3 Automatic Power Sequencing
      4. 10.1.4 Monitoring a Downstream Voltage
      5. 10.1.5 Monitoring the Input Voltage
      6. 10.1.6 Break-Before-Make Power MUX (TPS22953 Only)
      7. 10.1.7 Make-Before-Break Power MUX (TPS22953 Only)
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Inrush Current
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

11 Power Supply Recommendations

The device is designed to operate from a VBIAS range of 2.5 V to 5.7 V and a VIN range of 0.7 V to 5.7 V.  The power supply must be well regulated and placed as close to the device terminals as possible. It must be able to withstand all transient and load current steps. In most situations, using an input capacitance of 1 µF is sufficient to prevent the supply voltage from dipping when the switch is turned on.  In cases where the power supply is slow to respond to a large transient current or large load current step, additional bulk capacitance may be required on the input.

The requirements for larger input capacitance can be mitigated by adding additional capacitance to the CT pin. This causes the load switch to turn on more slowly. Not only does this reduce transient inrush current, but it also gives the power supply more time to respond to the load current step.