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

7.3.7 Enable (EN)

When the voltage at the enable pin is below the enable rising threshold, the device is in shutdown mode and the controller does not produce any output pulses. The device is enabled by bringing the voltage at the pin above this threshold, and after being enabled, the device can be disabled by reducing the voltage below the enable falling threshold. There are several ways in which the device can be enabled externally. A resistor divider from VIN to GND can be used to supply the EN voltage.

TPS7H5101-SEP Enable Pin Configuration Using Resistor DividerFigure 7-13 Enable Pin Configuration Using Resistor Divider

The resistors can be appropriately sized to turn on the device at the desired input voltage, as shown in Equation 10. This implementation creates an adjustable UVLO that complements the default internal UVLO thresholds on VIN.

Equation 10. REN_BOT=VEN(rising)VIN(rising)-VEN(rising)×REN_TOP

where

  • VIN(rising) is the input voltage value that causes EN to go high
  • VEN(rising) is the rising voltage threshold of the EN pin
  • REN_TOP is the feedback resistor from VIN to EN
  • REN_BOT is the feedback resistor from EN to GND

Likewise, Equation 11 can be used to calculate the VIN(falling) voltage.

Equation 11. VIN(falling)=VEN(falling)×REN_TOP+REN_BOTREN_BOT

where

  • VIN(falling) is the input voltage value that causes EN to go low
  • VEN(falling) is the falling voltage threshold of the EN pin

Alternatively, the EN pin can be driven directly from a microcontroller or FPGA. The low voltage threshold of the enable pin supports logic levels as low as 1.1V.

As discussed in Section 7.5, the TPS7H5101 can also be enabled and disabled through the PMBus interface. As such, there can be a condition where EN is externally above the necessary threshold for turn-on, but the device remains disabled based on the commanded state via PMBus. The default state for the PMBus enable is “on”, and as such at startup when then the EN pin is driven high the device is enabled without any initial PMBus command.