SNVAA32 july   2023 LMQ64480-Q1 , LMQ644A0-Q1 , LMQ644A2-Q1

 

  1.   1
  2.   LMQ644A2-Q1 6-Phase Buck Regulator Design for Automotive ADAS Applications
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Features and Electrical Performance
  5. 2Design Specifications
  6. 3Application Circuit Diagram and Operating Configuration Table
  7. 4Top and Bottom Board Views
  8. 5Test Data and Performance Curves
    1. 5.1 Conversion Efficiency
    2. 5.2 Operating Waveforms
      1. 5.2.1 6-phase Switching
      2. 5.2.2 Load Transient Response
      3. 5.2.3 Loop Response
      4. 5.2.4 Startup/Shutdown
    3. 5.3 Thermal Performance
    4. 5.4 CISPR 25 EMI Performance
  9. 6EVM Documentation
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
    3. 6.3 PCB Layout
  10. 74-Phase Configuration
    1. 7.1 4-Phase Switching
  11. 8Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 References
        1. 8.2.1.1 PCB Layout Resources
        2. 8.2.1.2 Thermal Design Resources

5.4 CISPR 25 EMI Performance

EMI filter (GCM155R71H104KE2D(C57,C67,C68),C2012X7R1V225K085AC(C58,C61,C620), 7427930(FB1), SER1052-102MLB(L7)) is used when testing

GUID-20220311-SS0I-SLGN-9RLB-5QW6XKQD7BV3-low.svg Figure 5-27 CISPR 25 Class 5 Conducted Emissions Plot, 150 kHz to 30 MHz (RBW =9kHz) , VIN = 24 V, VOUT = 3.3 V, IOUT = 36 A, Spread Spectrum enabled
GUID-20220311-SS0I-JXZC-XBHX-W6HQG2L0J4HX-low.svg Figure 5-28 CISPR 25 Class 5 Conducted Emissions Plot, 30 MHz to 108 MHz (RBW=120kHz) , VIN = 24 V, VOUT = 3.3 V, IOUT = 36 A, Spread Spectrum enabled