SLVSD52A October   2015  – January 2016 TPS63020-Q1

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Typical Application Schematic
  5. Revision History
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Dynamic Voltage Positioning
      2. 9.3.2 Dynamic Current Limit
        1. 9.3.2.1 Device Enable
        2. 9.3.2.2 Power Good
        3. 9.3.2.3 Overvoltage Protection
        4. 9.3.2.4 Undervoltage Lockout
        5. 9.3.2.5 Overtemperature Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Softstart and Short Circuit Protection
      2. 9.4.2 Buck-Boost Operation
      3. 9.4.3 Control Loop
      4. 9.4.4 Power Save Mode and Synchronization
  10. 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 Inductor Selection
        2. 10.2.2.2 Capacitor Selection
          1. 10.2.2.2.1 Input Capacitor
          2. 10.2.2.2.2 Output Capacitor
          3. 10.2.2.2.3 Bypass Capacitor
        3. 10.2.2.3 Setting the Output Voltage
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 2-A Load Current
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

12 Layout

12.1 Layout Guidelines

For all switching power supplies, the layout is an important step in the design, especially at high peak currents and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground tracks. The input capacitor, output capacitor, and the inductor should be placed as close as possible to the IC. Use a common ground node for power ground and a different one for control ground to minimize the effects of ground noise. Connect these ground nodes at any place close to one of the ground pins of the IC.

The feedback divider should be placed as close as possible to the control ground pin of the IC. To lay out the control ground, short traces are recommended as well, separation from the power ground traces. This avoids ground shift problems, which can occur due to superimposition of power ground current and control ground current.

12.2 Layout Example

TPS63020-Q1 layout_lvs916.gif Figure 19. PCB Layout Suggestion

12.3 Thermal Considerations

Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks and convection surfaces, and the presence of other heat-generating components affect the power-dissipation limits of a given component.

Three basic approaches for enhancing thermal performance are listed below:

  • Improving the power dissipation capability of the PCB design
  • Improving the thermal coupling of the component to the PCB by soldering the exposed thermal pad
  • Introducing airflow in the system

For more details on how to use the thermal parameters, see the application notes: Thermal Characteristics Application Note (SZZA017), and Semiconductor and IC Package Thermal Metrics Application Note (SPRA953).