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

Abstract

The TPSM63610 is a 6.5 × 7.5 mm2, 8-A rated, synchronous step-down power module that features a wide operating input range from 3 V to 36 V with adjustable output voltage range from 1 V to 20 V. This application report shows how the conventional evaluation board for the TPSM63610 can be configured for an inverting buck boost (IBB) application to produce a negative output voltage. This application note also provides the typical level-shifter circuitry needed to utilize the auxiliary functions of the power module in an IBB topology. Note that the TPSM63608 is a 6-A rated pin-to-pin compatible device to the TPSM63610. All the points discussed herein can be applied to the TPSM63608. For more information on inverting buck boost conversion, refer to the Working with Inverting Buck-Boost Converters application note for more details.