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

7.1 4-Phase Switching

The 6-phase board can be used to evaluate the device in 4-phase configuration. The following changes need to be made to configure the 4-phase converter.
Table 7-1 Board Modification for 4-Phase Evaluation
Ref. Designator Configuration
R25 73.2 kΩ
R26 19.1 kΩ
L5 Open
L6 Open
EN5 GND
EN6 GND
R23 Open
GUID-20220422-SS0I-RN85-4M5H-0JTFVCP4TFSC-low.svg Figure 7-1 SW Node Voltage, VIN = 12 V, VOUT = 3.3 V, FPWM mode