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

1.1 Concept

Referring to Figure 1-1, in a standard buck configuration, output voltage (VOUT) is a positive voltage referenced to Ground (0 V).

In the IBB configuration, SYS_GND is connected to device VOUT and the device return is now the negative output voltage (-VOUT). This configuration allows the output voltage to be inverted with respect to the input voltage.

GUID-20230426-SS0I-DHDT-HWJG-PJSTCXBBHQV2-low.svg Figure 1-1 Converting From Buck to Inverting Buck Boost Topology