SNVSBV1D February   2022  – November 2024 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

8.2.1.3 Application Curves

LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Efficiency
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
Fixed
Figure 8-4 Efficiency
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Dropout
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
Fixed
Figure 8-6 Dropout
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Input Switching Current vs Input Voltage
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
Fixed No Load
Figure 8-8 Input Switching Current vs Input Voltage
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Load Transient
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
0 A to 2 A,1 A / µs Fixed
Figure 8-10 Load Transient
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Load Transient
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (FPWM)
0 A to 1 A,1 A / µs Fixed
Figure 8-12 Load Transient
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Output Voltage Ripple
LMQ66430MC3 VOUT = 3.3 V 2 A Load
Fixed
Figure 8-14 Output Voltage Ripple
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 EVM Thermal Performance
LMQ66430MC3 VOUT = 3.3 V 12 VIN, 2 A, 2.2 MHz
Fixed
Figure 8-16 EVM Thermal Performance
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Conducted EMI 150 kHz–30 MHz Yellow: Peak Detect, Green: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-18 CISPR 25 Class 5 Conducted EMI 150 kHz–30 MHz
Yellow: Peak Detect, Green: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Radiated EMI, Rod Antenna, 150 kHz–30 MHz Blue: Peak Detect, Yellow: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-20 CISPR 25 Class 5 Radiated EMI, Rod Antenna, 150 kHz–30 MHz
Blue: Peak Detect, Yellow: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Radiated EMI, Biconical Antenna, Vertical Polarization, 30 MHz - 300 MHzOrange: Peak Detect, Yellow: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-22 CISPR 25 Class 5 Radiated EMI, Biconical Antenna, Vertical Polarization, 30 MHz - 300 MHz
Orange: Peak Detect, Yellow: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Radiated EMI, Log Antenna, Vertical Polarization, 300 MHz - 960 MHzOrange: Peak Detect, Blue: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-24 CISPR 25 Class 5 Radiated EMI, Log Antenna, Vertical Polarization, 300 MHz - 960 MHz
Orange: Peak Detect, Blue: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Efficiency
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (FPWM)
Fixed
Figure 8-5 Efficiency
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Line and Load Regulation
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
Fixed
Figure 8-7 Line and Load Regulation
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Input Current vs Load Current
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
Fixed
Figure 8-9 Input Current vs Load Current
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Load Transient
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
0.5 A to 1.5 A,1 A / µs Fixed
Figure 8-11 Load Transient
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Load Transient
LMQ66430MC3 VOUT = 3.3 V 2.2 MHz (Auto)
0 A to 1 A,1 A / µs Fixed
Figure 8-13 Load Transient
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Output Voltage Ripple
LMQ66430MC3 VOUT = 3.3 V No Load
Fixed
Figure 8-15 Output Voltage Ripple
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 EVM Thermal Performance
LMQ66430MC3 VOUT = 3.3 V 12 VIN, 3 A, 2.2 MHz
Fixed
Figure 8-17 EVM Thermal Performance
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Conducted EMI 30 MHz–108 MHz Yellow: Peak Detect, Green: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-19 CISPR 25 Class 5 Conducted EMI 30 MHz–108 MHz
Yellow: Peak Detect, Green: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Radiated EMI, Biconical Antenna, Horizontal Polarization, 30 MHz - 300 MHzRed: Peak Detect, Green: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-21 CISPR 25 Class 5 Radiated EMI, Biconical Antenna, Horizontal Polarization, 30 MHz - 300 MHz
Red: Peak Detect, Green: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 CISPR 25 Class 5 Radiated EMI, Log Antenna, Horizontal Polarization, 300 MHz - 960 MHzOrange: Peak Detect, Blue: Average Detect
VIN = 12.5 V VOUT = 3.3 V Fsw = 2.2 MHz
Load = 3 A
Figure 8-23 CISPR 25 Class 5 Radiated EMI, Log Antenna, Horizontal Polarization, 300 MHz - 960 MHz
Orange: Peak Detect, Blue: Average Detect
LMQ66410-Q1 LMQ66420-Q1 LMQ66430-Q1 Typical Input EMI Filter
Ferrite Bead Part Number
FBMH3225HM102NT
Figure 8-25 Typical Input EMI Filter