SLVAFC5 March   2022 TPS629210 , TPS629210-Q1

 

  1.   Trademarks
  2. 1Inverting Buck – Boost Topology
    1. 1.1 Concept
    2. 1.2 Output Current Calculations
    3. 1.3 VIN and VOUT Range
  3. 2Digital Pin Configurations
    1. 2.1 Enable Pin
    2. 2.2 MODE/S-CONF Pin
    3. 2.3 Power Good Pin
  4. 3Design Considerations
    1. 3.1 Input Capacitor Selection
    2. 3.2 Output Inductor Selection
    3. 3.3 Stability Limits and Output Capacitor Selection
  5. 4Layout Considerations
  6. 5How to Modify a Buck to Inverting Buck-Boost?
  7. 6Typical Performance and Waveforms
  8. 7Conclusion
  9. 8References

3 Design Considerations

The inductor and output capacitor need to be selected based on the needs of the application and the stability criteria of the device. The selection criterion for the inductor and output capacitor is different from the buck converter. See Selecting L and Cout for Stability for a discussion of stability.