SNVSCU9A May   2025  – November 2025 TPS7H4012-SEP , TPS7H4013-SEP

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Device Options Table
  7. 6 Pin Configuration and Functions
  8. 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 Quality Conformance Inspection
    7. 7.7 Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 VIN and Power VIN Pins (VIN and PVIN)
      2. 9.3.2 Voltage Reference
      3. 9.3.3 Voltage Sensing and Setting VOUT
        1. 9.3.3.1 Minimum Output Voltage
        2. 9.3.3.2 Maximum Output Voltage
      4. 9.3.4 Enable
      5. 9.3.5 Power Good (PWRGD)
      6. 9.3.6 Adjustable Switching Frequency and Synchronization
        1. 9.3.6.1 Internal Clock Mode
        2. 9.3.6.2 External Clock Mode
      7. 9.3.7 Turn-On Behavior
        1. 9.3.7.1 Soft-Start (SS_TR)
        2. 9.3.7.2 Safe Start-Up Into Prebiased Outputs
        3. 9.3.7.3 Tracking and Sequencing
      8. 9.3.8 Protection Modes
        1. 9.3.8.1 Overcurrent Protection
          1. 9.3.8.1.1 High-Side 1 Overcurrent Protection (HS1)
          2. 9.3.8.1.2 High-Side 2 Overcurrent Protection (HS2)
          3. 9.3.8.1.3 COMP Shutdown
          4. 9.3.8.1.4 Low-Side Overcurrent Sinking Protection
        2. 9.3.8.2 Output Overvoltage Protection (OVP)
        3. 9.3.8.3 Thermal Shutdown
      9. 9.3.9 Error Amplifier and Loop Response
        1. 9.3.9.1 Error Amplifier
        2. 9.3.9.2 Power Stage Transconductance
        3. 9.3.9.3 Slope Compensation
        4. 9.3.9.4 Frequency Compensation
    4. 9.4 Device Functional Modes
  11. 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  Operating Frequency
        2. 10.2.2.2  Output Inductor Selection
        3. 10.2.2.3  Output Capacitor Selection
        4. 10.2.2.4  Input Capacitor Selection
        5. 10.2.2.5  Soft-Start Capacitor Selection
        6. 10.2.2.6  Rising VIN Set Point (Configurable UVLO)
        7. 10.2.2.7  Output Voltage Feedback Resistor Selection
        8. 10.2.2.8  Output Voltage Accuracy
        9. 10.2.2.9  Slope Compensation Requirements
        10. 10.2.2.10 Compensation Component Selection
        11. 10.2.2.11 Schottky Diode
      3. 10.2.3 Application Curve
      4. 10.2.4 Inverting Buck-Boost
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1.     82

10.2.2.6 Rising VIN Set Point (Configurable UVLO)

An external resistor divider from VIN to GND is used to enable the TPS7H4012 when a desired preset input voltage is reached. In effect, this acts as an adjustable UVLO. First, 10V is selected as the desired turn-on voltage (VIN(rising)). Next, REN_TOP of 54.2kΩ is selected as a reasonable tradeoff between a large enough resistor to minimize power dissipation, but low enough to prevent excessive noise coupling to a high impedance node. Equation 4 is then used to calculate an REN_BOT of 3.52kΩ.

Since the enable pin has hysteresis, the resulting turn-off voltage can be calculated using Equation 5. It is found that the VIN(falling) is 8.36V. This means that once the regulator starts switching after rising above 10V (VIN(rising)), it will continue switching until falling below 8.36V.