SLVSFT8F February   2023  – December 2023 TPS7H1111-SEP , TPS7H1111-SP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options 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 Quality Conformance Inspection
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Bias Supply
      2. 8.3.2  Output Voltage Configuration
      3. 8.3.3  Output Voltage Configuration with a Voltage Source
      4. 8.3.4  Enable
      5. 8.3.5  Soft Start and Noise Reduction
      6. 8.3.6  Configurable Power Good
      7. 8.3.7  Current Limit
      8. 8.3.8  Stability
        1. 8.3.8.1 Output Capacitance
        2. 8.3.8.2 Compensation
      9. 8.3.9  Current Sharing
      10. 8.3.10 PSRR
      11. 8.3.11 Noise
      12. 8.3.12 Thermal Shutdown
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Application 1: Set Turn-On Threshold with EN
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Bias Supply
          2. 9.2.1.2.2 Output Voltage Configuration
          3. 9.2.1.2.3 Output Voltage Accuracy
          4. 9.2.1.2.4 Enable Threshold
          5. 9.2.1.2.5 Soft Start and Noise Reduction
          6. 9.2.1.2.6 Configurable Power Good
          7. 9.2.1.2.7 Current Limit
          8. 9.2.1.2.8 Output Capacitor and Ferrite Bead
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Application 2: Parallel Operation
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Current Sharing
        3. 9.2.2.3 Application Results
    3. 9.3 Capacitors Tested
    4. 9.4 TID Effects
    5. 9.5 Power Supply Recommendations
    6. 9.6 Layout
      1. 9.6.1 Layout Guidelines
      2. 9.6.2 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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • PWP|28
Thermal pad, mechanical data (Package|Pins)
Orderable Information
9.2.1.2.4 Enable Threshold

The desired turn-on threshold is 1.8 V. This means that as the VIN rail is turned-on and begins rising, the TPS7H1111 will begin turning-on as soon as VIN reaches 1.8 V. While this is not enough headroom from VIN to VOUT for final regulation, the regulator will begin start-up and VIN will continue to its final voltage of 2.5 V. If desired, a higher voltage turn-on threshold could also be utilized (for example, 2.2 V).

By using Equation 3 and selecting an REN_TOP value 56.2 kΩ, the REN_BOT resistor can be calculated as shown in Equation 16.

Equation 16. REN_BOT = VEN(rising) × REN_TOP / (VIN(rising) – VEN(rising)) = 0.6 V × 56.2 kΩ / (1.8 V – 0.6 V) = 28.1 kΩ

A standard value 28 kΩ resistor is selected for REN_BOT. The worst case (highest) VIN(rising) threshold is calculated using Equation 3 and the max VEN(rising) threshold of 0.62 V. This is determined to be 1.86 V which is acceptable. The typical VIN(falling) is then calculated using Equation 4. This is determined to be 1.50 V which is also acceptable.

It is also important to ensure Equation 5 is followed to prevent possible SEFIs. As shown in Equation 17, VEN(final) = 0.83 V which is greater than the recommended 0.8 V.

Equation 17. VIN(final) × REN_BOT / (REN_TOP + REN_BOT) = VEN(final) = 2.5 V × 28 kΩ / (56.2 kΩ + 28 kΩ) = 0.83 V