SLVSMQ4 September   2026 TPS7H5101-SEP

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  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
    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  D-CAP+
        1. 7.3.1.1 Load Transients
        2. 7.3.1.2 On-Time Control
        3. 7.3.1.3 Switching Frequency
        4. 7.3.1.4 Droop Regulation
        5. 7.3.1.5 Ramp Compensation
        6. 7.3.1.6 Undershoot Reduction (USR)
        7. 7.3.1.7 Overshoot Reduction (OSR)
        8. 7.3.1.8 Current Sensing and Current Sharing
        9. 7.3.1.9 Blanking Time (BLANK)
      2. 7.3.2  PWM Signals
      3. 7.3.3  Remote Sensing and Setting VOUT
      4. 7.3.4  Input Voltage (VIN)
      5. 7.3.5  VLDO
      6. 7.3.6  Voltage Reference (VREF)
      7. 7.3.7  Enable (EN)
      8. 7.3.8  Power Good (PG)
      9. 7.3.9  Turn-On Behavior
        1. 7.3.9.1 Soft-Start (SS)
      10. 7.3.10 Current Monitor Output (ISUM)
      11. 7.3.11 Overcurrent Protection
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 PMBus General Description
      2. 7.5.2 Write Byte
      3. 7.5.3 Read Byte
      4. 7.5.4 Send Byte
      5. 7.5.5 Packet Error Checking (PEC)
      6. 7.5.6 Additional Faults
      7. 7.5.7 PMBus Command Overview
      8. 7.5.8 PMBus Address Selection
  9. 8 Register Map
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inductor Selection
        2. 9.2.2.2 Current Limit Threshold
        3. 9.2.2.3 Load-Line Setting
        4. 9.2.2.4 Output Capacitor Selection
        5. 9.2.2.5 Loop Compensation
      3. 9.2.3 Application Curve
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1.     76

9.2.2.2 Current Limit Threshold

The inductor saturation current rating needs to handle the expected overcurrent in the system. To determine the proper saturation current rating, the valley overcurrent threshold, and the corresponding peak current during that mode, are calculated. Referring to Equation 14, the valley overcurrent protection limit is selected according to Equation 18.

Equation 18. IVALLEY=M×IOUT_MAXn-IPP2

In this equation:

  • M is the desired percentage margin above the maximum load current

After the desired valley current for the overcurrent is determined, the proper value of ROCL needed to program this threshold is determined based on equating Equation 14 and Equation 15. The minimum saturation current rating that is required of the inductor is based on the worst-case peak current seen during the overcurrent condition, as calculated in Equation 19.

Equation 19. ISAT=IVALLEY+IPP