SNVSBV1C February   2022  – December 2023 LMQ66410-Q1 , LMQ66420-Q1 , LMQ66430-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Enable, Start-Up, and Shutdown
      2. 7.3.2  External CLK SYNC (With MODE/SYNC)
        1. 7.3.2.1 Pulse-Dependent MODE/SYNC Pin Control
      3. 7.3.3  Power-Good Output Operation
      4. 7.3.4  Internal LDO, VCC, and VOUT/FB Input
      5. 7.3.5  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      6. 7.3.6  Output Voltage Selection
      7. 7.3.7  Spread Spectrum
      8. 7.3.8  Soft Start and Recovery from Dropout
        1. 7.3.8.1 Recovery from Dropout
      9. 7.3.9  Current Limit and Short Circuit
      10. 7.3.10 Thermal Shutdown
      11. 7.3.11 Input Supply Current
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
        1. 7.4.3.1 CCM Mode
        2. 7.4.3.2 Auto Mode – Light Load Operation
          1. 7.4.3.2.1 Diode Emulation
          2. 7.4.3.2.2 Frequency Reduction
        3. 7.4.3.3 FPWM Mode – Light Load Operation
        4. 7.4.3.4 Minimum On-Time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design 1 - Automotive Synchronous Buck Regulator at 2.2 MHz
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Choosing the Switching Frequency
          2. 8.2.1.2.2  Setting the Output Voltage
            1. 8.2.1.2.2.1 VOUT / FB for Adjustable Output
          3. 8.2.1.2.3  Inductor Selection
          4. 8.2.1.2.4  Output Capacitor Selection
          5. 8.2.1.2.5  Input Capacitor Selection
          6. 8.2.1.2.6  CBOOT
          7. 8.2.1.2.7  VCC
          8. 8.2.1.2.8  CFF Selection
          9. 8.2.1.2.9  External UVLO
          10. 8.2.1.2.10 Maximum Ambient Temperature
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2 - Automotive Synchronous Buck Regulator at 400 kHz
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10 Revision History

Changes from Revision B (May 2023) to Revision C (December 2023)

  • Changed the number of package pins from 15 to 14. The GND/DAP is not included in the pin count. Go
  • Changed the document status from Production Mixed to Production Data. Go
  • Added LMQ66430MA5RXBRQ1, LMQ66430MA3RXBRQ1, LMQ66420MA5RXBRQ1, LMQ66410MA3RXBRQ1, LMQ66410MA5RXBRQ1 to the Device Comparison Table. Deleted preview tag from remaining OPNs.Go
  • Changed pin numbering from 15 to 14. The GND/DAP is not included in the pin numbering.Go
  • Changed Device Nomenclature frequency trim option 'C' from 2 MHz to 2.2 MHz and changed the number of pins from 15 to 14. The GND/DAP is not included in the pin count.Go

Changes from Revision A (December 2022) to Revision B (May 2023)

  • Placed the functional safety bullet at the top of the Features section.Go
  • Removed 'Preview' tag from 1-A and 2-A options. Removed reference to RT variants.Go
  • Removed 'LMR' orderables from the Device Comparison Table Go
  • Added LMQ66420MA3RXBRQ1 to the Device Comparison Table Go
  • Added note regarding other device orderable optionsGo
  • Removed references to RT pin and LMQ variants. Included pin 4 and pin 5 must be floating.Go
  • Included 1-A and 2-A current limit information and 400-kHz and 2.2-MHz fixed frequency specifications as well as IBIAS specification for 3.3-V fixed and 5-V fixed. Go
  • Removed RT pin from the functional block diagram and removed note regarding LMR variantsGo
  • Corrected the delay time from when EN goes high to when the part begins to switch from 1 ms to 2.5 ms.Go
  • Removed references to LMR variants. Go
  • Included recommended passive component tables for the 1-A and 2-A variants.Go
  • Corrected typo in stated output voltage from 5-V to 3.3-V.Go
  • Corrected recommended inductor K value from 0.3 to 0.2.Go
  • Removed references to LMR variants. Go

Changes from Revision * (February 2022) to Revision A (December 2022)

  • Changed status from "Advance Information" to "Production Data"Go