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

1.1 Features and Electrical Performance

  • Provides three output voltage options (2.5 V, 3.3 V and 5.0 V)
  • Wide input operating range of 3 V to 36 V (requires minimum 3.8 V to start up)
  • Small input and output voltage ripple with 6-phase configuration
  • Supports external clock synchronization
  • High efficiency across wide input voltage ranges
    • Peak 95.2% at VIN = 12 V, VOUT = 3.3 V
    • Peak 93.4% at VIN = 24 V, VOUT = 3.3 V
  • Optional power supply input for EMI filter evaluation
  • Selectable Forced PWM (FPWM) or Auto mode
  • Selectable spread spectrum modulation
  • Integrated low RDSON MOSFETs
  • Peak current limit with hiccup mode overload protection
  • User-adjustable soft-start time
  • User-programmable loop compensation
  • Power Good indicator with 100-kΩ pullup resistors to VCC
  • Proven 6-layer PCB layout
  • Passes CISPR-25 Class5 CE