SNVSBE0G October   2020  – May 2024 LMR43610-Q1 , LMR43620-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  Adjustable Switching Frequency (with RT)
      4. 7.3.4  Power-Good Output Operation
      5. 7.3.5  Internal LDO, VCC, and VOUT/FB Input
      6. 7.3.6  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      7. 7.3.7  Output Voltage Selection
      8. 7.3.8  Spread Spectrum
      9. 7.3.9  Soft Start and Recovery from Dropout
        1. 7.3.9.1 Recovery from Dropout
      10. 7.3.10 Current Limit and Short Circuit
      11. 7.3.11 Thermal Shutdown
      12. 7.3.12 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 Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Choosing the Switching Frequency
        2. 8.2.2.2  Setting the Output Voltage
          1. 8.2.2.2.1 FB for Adjustable Output
        3. 8.2.2.3  Inductor Selection
        4. 8.2.2.4  Output Capacitor Selection
        5. 8.2.2.5  Input Capacitor Selection
        6. 8.2.2.6  CBOOT
        7. 8.2.2.7  VCC
        8. 8.2.2.8  CFF Selection
        9. 8.2.2.9  External UVLO
        10. 8.2.2.10 Maximum Ambient Temperature
      3. 8.2.3 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

4 Device Comparison Table

ORDERABLE PART NUMBER (1) OUTPUT CURRENT OUTPUT VOLTAGE EXTERNAL SYNC FSW SPREAD SPECTRUM
LMR43620MSC3RPERQ1 2A 3.3V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 Yes
LMR43620MSC5RPERQ1 2A 5V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 Yes
LMR43620MC3RPERQ1 2A 3.3V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 No
LMR43620MC5RPERQ1 2A 5V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 No
LMR43620RS3QRPERQ1 2A 3.3V fixed / adjustable No
(Default PFM at light load)		 Adjustable
with RT resistor		 Yes
LMR43620RS5QRPERQ1 2A 5V fixed / adjustable No
(Default PFM at light load)		 Adjustable
with RT resistor		 Yes
LMR43610MSC3RPERQ1 1A 3.3V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 Yes
LMR43610MSC5RPERQ1 1A 5V fixed / adjustable Yes
(PFM/FPWM selectable)		 Fixed
2.2MHz		 Yes
LMR43610RS3QRPERQ1 1A 3.3V fixed / adjustable No
(Default PFM at light load)		 Adjustable
with RT resistor		 Yes
LMR43610RS5QRPERQ1 1A 5V fixed / adjustable No
(Default PFM at light load)		 Adjustable
with RT resistor		 Yes
(1) For more information on device orderable part numbers, see Device Nomenclature.