SLVSG41 January   2022 TPS7H4003-SEP

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  VIN and Power VIN Pins (VIN and PVIN)
      2. 7.3.2  Voltage Reference
      3. 7.3.3  Adjusting the Output Voltage
      4. 7.3.4  Safe Start-Up Into Prebiased Outputs
      5. 7.3.5  Error Amplifier
      6. 7.3.6  Enable and Adjust UVLO
      7. 7.3.7  Adjustable Switching Frequency and Synchronization (SYNC)
        1. 7.3.7.1 Internal Oscillator Mode
        2. 7.3.7.2 External Synchronization Mode
        3. 7.3.7.3 Primary-Secondary Operation Mode
      8. 7.3.8  Soft-Start (SS/TR)
      9. 7.3.9  Power Good (PWRGD)
      10. 7.3.10 Sequencing
      11. 7.3.11 Output Overvoltage Protection (OVP)
      12. 7.3.12 Overcurrent Protection
        1. 7.3.12.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.12.2 Low-Side MOSFET Overcurrent Protection
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 Turn-On Behavior
      15. 7.3.15 Slope Compensation
        1. 7.3.15.1 Slope Compensation Requirements
      16. 7.3.16 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Fixed-Frequency PWM Control
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Operating Frequency
        2. 8.2.2.2 Output Inductor Selection
        3. 8.2.2.3 Output Capacitor Selection
        4. 8.2.2.4 Output Schottky Diode
        5. 8.2.2.5 Input Capacitor Selection
        6. 8.2.2.6 Soft-Start Capacitor Selection
        7. 8.2.2.7 Undervoltage Lockout (UVLO) Set Point
        8. 8.2.2.8 Output Voltage Feedback Resistor Selection
          1. 8.2.2.8.1 Minimum Output Voltage
        9. 8.2.2.9 Compensation Component Selection
      3. 8.2.3 Parallel Operation
      4. 8.2.4 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 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
  12. 12Mechanical, Packaging, and Orderable Information

9 Power Supply Recommendations

The TPS7H4003-SEP is designed to operate from an input voltage supply range between 3 V and 7 V. This supply voltage must be well regulated. Power supplies must be well bypassed for proper electrical performance. This includes a minimum of one 4.7 µF (after de-rating) ceramic capacitor, type X5R or better from PVIN to GND, and from VIN to GND. Additional local ceramic bypass capacitance may be required in systems with small input ripple specifications, as well as additional bulk capacitance if the TPS7H4003-SEP device is located more than a few inches away from its input power supply. Bypass capacitors should be placed as close as possible to the input pins and have a low impedance path to GND.

Larger values of bypass capacitance will improve the response to radiation induced transients. The TPS7H4003-SEP Evaluation Module uses 6 × 22-µF capacitors in addition to 2 × 330-µF capacitors in parallel on the PVIN input. In systems with an auxiliary power rail available, the power stage input, PVIN, and the analog power input, VIN, may operate from separate input supplies.