SLVSEW6F August   2021  – March 2024 TPS7H2211-SEP , TPS7H2211-SP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options
  6. 5 Related Products
  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: All Devices
    6. 7.6  Electrical Characteristics: CFP and KGD Options
    7. 7.7  Electrical Characteristics: HTSSOP Option
    8. 7.8  Switching Characteristics: All Devices
    9. 7.9  Quality Conformance Inspection
    10. 7.10 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 Enable and Overvoltage Protection
      2. 9.3.2 Current Limit
      3. 9.3.3 Soft Start (Adjustable Rise Time)
      4. 9.3.4 Parallel Operation
      5. 9.3.5 Reverse Current Protection
      6. 9.3.6 Forward Leakage Current
    4. 9.4 Device Functional Modes
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Application 1: Cold Sparing
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Capacitance
          2. 10.2.1.2.2 Enable Control
          3. 10.2.1.2.3 Overvoltage Protection
          4. 10.2.1.2.4 Soft Start Time
          5. 10.2.1.2.5 Summary
        3. 10.2.1.3 Application Curve
      2. 10.2.2 Application 2: Protection
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
          1. 10.2.2.2.1 Capacitance
          2. 10.2.2.2.2 Enable Control
          3. 10.2.2.2.3 Overvoltage Protection
          4. 10.2.2.2.4 Soft Start Time
          5. 10.2.2.2.5 Summary
        3. 10.2.2.3 Application Curve
    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 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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DAP|32
Thermal pad, mechanical data (Package|Pins)
Orderable Information
10.2.2.2.3 Overvoltage Protection

The TPS7H2211 eFuse is exceptionally well suited to provide overvoltage protection in this application. This is because even if the upstream regulator fails in a manner that shorts its input to output (12 V), the TPS7H2211 eFuse is able to handle up to 14 V at the input with full data sheet specified performance.

The overvoltage protection is set by configuring the RBOT_OVP and RTOP_OVP resistors similarly to Section 10.2.1.2.3. The overvoltage protection feature turns off the switch if the input voltage exceeds a predetermined value. For this design, the goal is to have the overvoltage protection activate at a nominal voltage of 5.4 V. First set RTOP_OVP = 100 kΩ with a 0.1% tolerance resistor, then use Equation 20 to calculate the nominal value of RBOT_OVP. A nominal 27-kΩ 0.1% tolerance resistor best satisfies the equation.

Equation 20. GUID-E03922BF-5604-4082-89DD-9FFE6F6F5F5E-low.gif

where

  • VOVPR(TYP) = 1.15 V
  • RTOP_OVP = 100 kΩ
  • VINOVP_RISE = 5.4 V

In order to ensure the selected RBOT_OVP value is acceptable for both the minimum and maximum OVP rising threshold, use Equation 21. VINOVP_RISE(MIN) is selected as the highest possible value that VIN will reach during nominal operation. VINOVP_RISE(MAX) may be selected by the user as long as it is within the VIN of the Recommended Operating Conditions. These selections result in an allowable value of RBOT_OVP between 9.214 kΩ and 27.791 kΩ. The selected 27 kΩ-0.1% tolerance resistor satisfies these constraints, even when taking into account its tolerance.

Equation 21. GUID-472C2F99-1B6C-45AF-9D96-D4C168D9B876-low.gif

where

  • VOVPR(MAX) = 1.18 V
  • RTOP_OVP = 100 kΩ
  • Rtolerance = 0.01% = 0.001
  • VINOVP_RISE(MAX) = 14 V
  • VOVPR(MIN) = 1.11 V
  • VINOVP_RISE(MIN) = VIN × (1 + tolerance) = 5.1 V

Since the OVP pin has hysteresis, the OVP falling threshold will be different than the rising threshold. Therefore, in order to ensure the selected RBOT_OVP value is acceptable for the OVP falling threshold, use Equation 22. VINOVP_FALL(MIN) and VINOVP_FALL(MAX) values may be selected using the same method as for VINOVP_RISE(MIN) and VINOVP_RISE(MAX). These selections results in an allowable RBOT_OVP value between of 9.128 kΩ and 27.154 kΩ. The selected 27 kΩ-0.1% tolerance resistor also satisfies these constraints, even when taking into account its tolerance.

Equation 22. GUID-24F619C3-9AF8-46D9-8726-00F3CC3BEEB4-low.gif

where

  • VOVPF(MAX) = 1.17 V
  • RTOP_OVP = 100 kΩ
  • Rtolerance = 0.001
  • VINOVP_FALL(MAX) = 14 V
  • VOVPF(MIN) = 1.09 V
  • VINOVP_FALL(MIN) = VIN × (1 + tolerance) = 5.1 V

To summarize, using Equation 3 and Equation 4 with RTOP_OVP = 100 kΩ and RBOT_OVP = 27 kΩ, the eFuse will nominally go into overvoltage protection mode at 5.41 V and exit at 5.36 V. Taking into account the minimum and maximum OVP pin threshold and resistor tolerances, the switch will enter overvoltage protection mode between 5.21 V and 5.56 V and exit between 5.12 V and 5.51 V.