SLVAFB4 July   2022 TPS62902-Q1 , TPS62903 , TPS62903-Q1

 

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

5 Conclusion

The TPS62903 can be configured as an inverting buck boost converter to generate a negative output voltage. The inverting buck boost topology changes some system characteristics, such as input voltage range and maximum output current. This application note explains the inverting buck boost topology and how to select the external components with the changed system characteristics. Measured data from the example design is provided.