SNVAA71 October   2023 TPSM63610

 

  1.   1
  2.   Using the TPSM63610/08 for Negative Output, Inverting Buck Boost Application
  3.   Trademarks
  4. 1Inverting Buck-Boost Topology
    1. 1.1 Concept
    2. 1.2 VIN and VOUT Range In Inverting Configuration
    3. 1.3 Output Current Calculations
  5. 2Design Considerations
    1. 2.1 Additional Bypass Capacitor and Schottky Diode
    2. 2.2 Start-up Behavior and Switching Node Consideration
  6. 3External Components
    1. 3.1 Capacitor Selection
    2. 3.2 System Loop Stability
    3. 3.3 UVLO
  7. 4Typical Performance
  8. 5Digital Pin Configurations
    1. 5.1 Digital Input Pin (EN)
    2. 5.2 Power-Good Pin
  9. 6Summary
  10. 7References

6 Summary

The TPSM63610 step-down power module can be configured in an IBB topology to generate a negative output voltage. The input voltage range is lowered because the device now has a reference point set to the negative output voltage. Additionally, the inductor peak current is much higher effectively lowering the recommended maximum output current operating range. Converting an original buck topology into an IBB topology results in a lowered input voltage range and lower output current capabilities. Additional level-shifting circuitry is required to ensure the correct operational voltage levels for the EN and PGOOD pins.