SDAA482 September   2026 BQ25756

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Inductor Selection
    1. 2.1 Duty Cycle
    2. 2.2 Inductance Selection
    3. 2.3 Inductor Ripple and Peak Current
    4. 2.4 Using the BQ2575X Design Calculator
  6. 3Inductor Losses
    1. 3.1 Resistance Losses
    2. 3.2 Magnetic Losses
    3. 3.3 General Rules for Inductor Selection
  7. 4Bill of Materials (BOM) Evaluation
  8. 5Summary
  9. 6References

2 Inductor Selection

To select the inductor, the following parameters need to be specified:

  • Input voltage range
  • Maximum output voltage
  • Charging current
  • Maximum possible FSW

Based on these specifications, the following parameters can be calculated:

  1. Duty cycle of worst case operating conditions in buck and boost modes
  2. Minimum inductance in buck mode
  3. Minimum inductance in boost mode
  4. The inductor ripple current