SLVSCY5F February   2016  – January 2023 TPS82130

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommend Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM and PSM Operation
      2. 7.3.2 Low Dropout Operation (100% Duty Cycle)
      3. 7.3.3 Switch Current Limit
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable and Disable (EN)
      2. 7.4.2 Soft Start-Up (SS/TR)
      3. 7.4.3 Voltage Tracking (SS/TR)
      4. 7.4.4 Power-Good Output (PG)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 1.8-V Output Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design with WEBENCH® Tools
          2. 8.2.1.2.2 Setting the Output Voltage
          3. 8.2.1.2.3 Input and Output Capacitor Selection
          4. 8.2.1.2.4 Soft Start-Up Capacitor Selection
        3. 8.2.1.3 Application Performance Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
      3. 8.4.3 Thermal Consideration
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Third-Party Products Disclaimer
        2. 9.1.1.2 Custom Design with WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Glossary
    7. 9.7 Electrostatic Discharge Caution
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
  • SIL|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.2 Soft Start-Up (SS/TR)

The internal voltage clamp controls the output voltage slope during start-up. This avoids excessive inrush current and ensures a controlled output voltage rise time. When the EN pin is pulled high, the device starts switching after a delay of typically 55 μs and the output voltage rises with a slope controlled by an external capacitor connected to the SS/TR pin. Using a very small capacitor or leaving the SS/TR pin floating provides the fastest start-up time.

The TPS82130 is able to start into a pre-biased output capacitor. During the pre-biased start-up, both the power MOSFETs are not allowed to turn on until the internal voltage clamp sets an output voltage above the pre-bias voltage.

When the device is in shutdown, undervoltage lockout, or thermal shutdown, the capacitor connected to the SS/TR pin is discharged by an internal resistor. Returning from those states causes a new start-up sequence.