SLVAFJ3 september   2023 LM251772 , LM5177 , LM51770 , LM51770-Q1 , LM51772 , LM51772-Q1

 

  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

Abstract

A layout is very important when designing a switching regulated power supply. If a layout is not carefully done, the regulator can suffer from instability and noise problems. To prevent radiation of high-frequency noise (for example, EMI), proper layout of the high-frequency switching path is essential. This application note provides guidance on how to route the LM5177 power supply layout which can help to achieve a robust and reliable design.