SLVA469D June   2013  – January 2023 TLV62130 , TLV62130A , TLV62150 , TLV62150A , TPS61175 , TPS61175-Q1 , TPS62130 , TPS62130A , TPS62131 , TPS62132 , TPS62133 , TPS62135 , TPS62136 , TPS62140 , TPS62140A , TPS62141 , TPS62142 , TPS62143 , TPS62150 , TPS62150A , TPS62151 , TPS62152 , TPS62153 , TPS62160 , TPS62161 , TPS62162 , TPS62163 , TPS62170 , TPS62171 , TPS62172 , TPS62173

 

  1.   Using the TPS6215x in an Inverting Buck-Boost Topology
  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. 2Design Considerations
    1. 2.1 Design Precautions
    2. 2.2 Additional Input Capacitor
    3. 2.3 Digital Pin Configurations
      1. 2.3.1 Digital Input Pins (EN, FSW, DEF)
      2. 2.3.2 Power Good Pin
    4. 2.4 Startup Behavior and Switching Node Consideration
  5. 3External Component Selection
    1. 3.1 Inductor Selection
    2. 3.2 Capacitor Selection
  6. 4Typical Performance
  7. 5Conclusion
  8. 6References
  9. 7Revision History

1 Using the TPS6215x in an Inverting Buck-Boost Topology

The TPS6215x family of synchronous buck dc-to-dc converters from Texas Instruments features a wide operating input voltage range from 3 V to 17 V and an adjustable output voltage of 0.9 V to 6 V. These devices are well-suited for many applications, such as standard 12-V rail supplies, embedded systems, and portable applications. Furthermore, the TPS6215x can be configured in an inverting buck-boost topology, where the output voltage is inverted or negative with respect to ground. This application report describes the inverting buck-boost topology in detail for the TPS6215x family. This topology can also be applied to the TPS6213x/4x/6x/7x converters.

Note: Precautions need to be taken when using these devices in an inverting buck-boost topology. Please review Section 2.1 to understand and robustly eliminate known risk.