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

5.1 Digital Input Pin (EN)

If control of the enable feature is desired in a IBB topology, a level shifter is required since the IC providing the EN signal may not be referenced to the negative output voltage of the IBB. Figure 5-1 is a typical level shift circuit. Ensure the abs max rating of the EN pin are not violated based on the Absolute Maximum Ratings section of the TPSM63610 data sheet. For a robust design, use a Zener clamp to suppress voltage transient between VIN and |VOUT| that may exceed the abs max rating of the EN pin

GUID-D6116AA6-8B92-4CF6-821D-0BDD62D610A7-low.svg Figure 5-1 EN Pin Level Shifter