SNVA432D March   2010  – January 2022 LM21305

 

  1.   Trademarks
  2. 1 LM21305 Overview
  3. 2 Typical Application Circuit
  4. 3 Evaluation Board Schematic
  5. 4 Evaluation Board Bill of Materials (BOM)
  6. 5 Connection Descriptions
  7. 6 Jumper Settings
  8. 7 Other Design Examples
  9. 8 Typical Performance Characteristics
  10. 9 Component Selection
    1. 9.1 Input Capacitors
    2. 9.2 AVIN Filter
    3. 9.3 Switching Frequency Selection
    4. 9.4 Inductor
    5. 9.5 Output Capacitor
    6. 9.6 Compensation Circuit
  11. 10PCB Layout
  12. 11Revision History

9 Component Selection

This section provides a simplified design procedure necessary to select the external components to build a fully functional efficient step-down power supply. As with any DC-DC converter, numerous tradeoffs are possible to optimize the design for efficiency, size, and performance. Unless otherwise indicated, all formulas assume units of the following:

  • Amps (A) for current
  • Farads (F) for capacitance
  • Henries (H) for inductance
  • Volts (V) for voltages
  • Hertz (Hz) for frequencies

For more details, please refer to the LM21305 data sheet.