SLVAFJ3 september   2023 LM5177 , LM51772

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Importance of DC-DC Power Supply Layout
  5. 2Steps for a Good Layout
    1. 2.1 Identifying Critical Circuit Paths
    2. 2.2 Optimizing Hot Loops in the Power Stage
    3. 2.3 Separating Differential Sense Lines From Power Planes
      1. 2.3.1 Using Net Ties to Separate Routing
    4. 2.4 Routing Gate-Drive and Return Paths
    5. 2.5 Controller Layout
    6. 2.6 Separate AGND and PGND
    7. 2.7 Thermal Vias
  6. 3Tips for Layout Optimization
  7. 4Layout Example
  8. 5Summary
  9. 6References

5 Summary

Printed circuit board (PCB) layout design plays a critical role in achieving high performance for a four-switch buck-boost regulator. Every layout is different, but what remains consistent is that to produce a good layout, you must understand the circuit fully and the environment or application that the board will be a part of. Carefully consider each block of components on the schematic, whether they are there for safety, EMI, feedback, thermal relief, and so on.

This application note describes the layout steps for good layout for LM5177. The document begins with the identification of the critical switching loops. By proper power component placement, keeping critical loops small, and carefully routing the sensitive traces, you can achieve a good and robust power supply layout.