SLVSG98B February   2023  – March 2024 TPS628301 , TPS628302 , TPS628303 , TPS628304

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information Discrete
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse Width Modulation (PWM) Operation
      2. 7.3.2 Power Save Mode (PSM) Operation
      3. 7.3.3 Start-Up and Soft Start
      4. 7.3.4 Switch Cycle-by-Cycle Current Limit
      5. 7.3.5 Short-Circuit Protection
      6. 7.3.6 Undervoltage Lockout
      7. 7.3.7 Thermal Shutdown
      8. 7.3.8 Optimized EMI Performance
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable, Disable, and Output Discharge
      2. 7.4.2 Minimum Duty Cycle and 100% Mode Operation
      3. 7.4.3 Power Good
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Setting The Output Voltage
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Output Capacitor Selection
        5. 8.2.2.5 Input Capacitor Selection
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
        1. 8.4.2.1 Thermal Considerations
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.3 Start-Up and Soft Start

When the EN voltage goes High, the device starts loading the default values into the device registers. This action typically is done within 120 μs. After that, the internal soft-start circuitry controls the output voltage during start-up. This control avoids excessive inrush current and makes sure of a controlled output voltage ramp. This control also prevents unwanted voltage drops from high-impedance power sources or batteries. Finally, the PG signal has a delay up to 180 μs at start-up. Figure 7-5 shows a start-up sequence, where the EN pin is pulled up to VIN.

GUID-20230721-SS0I-64MK-6SMN-KFNMKBL7LP3D-low.svg Figure 7-3 Start-Up Timing When EN is Pulled Up to VIN

Figure 7-4 shows a start-up sequence, where an external signal is connected to the EN pin.

GUID-20230721-SS0I-JDV4-N8S6-DTZ4PNP6X2BV-low.svg Figure 7-4 Start-Up Timing When an External Signal is Connected to the EN Pin

The TPS62830x can start into a prebiased output if enabled for the first time. For a new prebiased operation, a power cycle is needed to disable the active output discharge. Figure 7-5 shows a start-up into a prebiased output voltage.

GUID-20211007-SS0I-XRFH-LS52-PZPKL60TRMTV-low.svg Figure 7-5 Start-Up into a Prebiased Output