SNVSC42A September   2023  – July 2024 LMQ644A2-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
    1. 5.1 Wettable Flanks
  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 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  Input Voltage Range (VIN)
      2. 7.3.2  Enable EN Pin and Use as VIN UVLO
      3. 7.3.3  Output Voltage Selection and Soft Start
      4. 7.3.4  SYNC Allows Clock Synchronization and Mode Selection
      5. 7.3.5  Clock Locking
      6. 7.3.6  Adjustable Switching Frequency
      7. 7.3.7  Power-Good Output Voltage Monitoring
      8. 7.3.8  Internal LDO, VCC UVLO, and BIAS Input
      9. 7.3.9  Bootstrap Voltage and VCBOOT-UVLO (CB1 and CB2 Pin)
      10. 7.3.10 CONFIG Device Configuration Pin
      11. 7.3.11 Spread Spectrum
      12. 7.3.12 Soft Start and Recovery From Dropout
      13. 7.3.13 Overcurrent and Short-Circuit Protection
      14. 7.3.14 Hiccup
      15. 7.3.15 Thermal Shutdown
    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 Peak Current Mode Operation
        2. 7.4.3.2 Auto Mode Operation
          1. 7.4.3.2.1 Diode Emulation
        3. 7.4.3.3 FPWM Mode Operation
        4. 7.4.3.4 Minimum On-time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
        6. 7.4.3.6 Recovery from Dropout
        7. 7.4.3.7 Other Fault Modes
  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
        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  BOOT Capacitor
        7. 8.2.2.7  VCC
        8. 8.2.2.8  CFF and RFF Selection
        9. 8.2.2.9  SYNCHRONIZATION AND MODE
        10. 8.2.2.10 External UVLO
        11. 8.2.2.11 Typical Thermal Performance
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Ground and Thermal Considerations
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.3 Application Curves

Unless otherwise specified, the following conditions apply: Device: LMQ644A2, VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 8-1, and Figure 8-2 with the appropriate BOM from Table 8-7.

LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 400 kHz Auto mode Single Output
Figure 8-9 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 400 kHz FPWM mode Single Output
Figure 8-11 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 400 kHz Auto mode Single Output
Figure 8-13 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz Auto mode Single Output
Figure 8-15 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz FPWM mode Single Output
Figure 8-17 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Single Output
Figure 8-19 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-21 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz FPWM mode Dual Output
Figure 8-23 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-25 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode Single Output
Figure 8-27 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode Dual Output
Figure 8-29 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 5 V FSW = 2.1 MHz FPWM mode Dual Output
Figure 8-31 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dropout
VOUT = 5 V FSW = 400 kHz FPWM mode Single Output
Figure 8-33 Dropout
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dropout
VOUT = 3.3 V FSW = 400 kHz FPWM mode Single Output
Figure 8-35 Dropout
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dropout Recovery
VOUT = 5 V FSW = 400 kHz Auto mode
IOUT = 3 A VIN = 5 to 7 V Single Output
Figure 8-37 Dropout Recovery
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Start-Up With 100-mA Load
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 100 mA VIN = 13.5 V Dual Output
Figure 8-39 Start-Up With 100-mA Load
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Short-Circuit Protection
VOUT = 3.3 V FSW = 400 kHz Auto mode
IOUT = 0 A to Short Circuit VIN = 13.5 V Single Output
Figure 8-41 Short-Circuit Protection
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Short-Circuit Hiccup
VOUT = 3.3 V FSW = 400 kHz Auto mode
IOUT = Short Circuit to 0 A VIN = 13.5 V Single Output
Figure 8-43 Short-Circuit Hiccup
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 5 V FSW = 2.1 MHz FPWM mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-45 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 5 V FSW = 400 kHz Auto mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-47 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-49 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode
IOUT = 3 A to 6 A to 3 A VIN = 13.5 V Dual Output
Figure 8-51 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 400 kHz Auto mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-53 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 4 A to 12 A to 4 A VIN = 13.5 V Single Output
Figure 8-55 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Monopole Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 150 kHz to 30 MHz
Figure 8-57 Single Output Monopole Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Log Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 200 MHz to 1000 MHz
Figure 8-59 Single Output Log Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 150 kHz to 30 MHz
Figure 8-61 Single Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Monopole Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 150 kHz to 30 MHz
Figure 8-63 Dual Output Monopole Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Log Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 200 MHz to 1000 MHz
Figure 8-65 Dual Output Log Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 150 kHz to 30 MHz
Figure 8-67 Dual Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Recommended Input EMI Filter
Figure 8-69 Recommended Input EMI Filter
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 400 kHz Auto mode Single Output
Figure 8-10 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 400 kHz Auto mode Single Output
Figure 8-12 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 400 kHz FPWM mode Single Output
Figure 8-14 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz Auto mode Single Output
Figure 8-16 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Single Output
Figure 8-18 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode Single Output
Figure 8-20 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 5 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-22 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-24 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Efficiency
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode Dual Output
Figure 8-26 Efficiency
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Single Output
Figure 8-28 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 3.3 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-30 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load and Line Regulation
VOUT = 5 V FSW = 2.1 MHz Auto mode Dual Output
Figure 8-32 Load and Line Regulation
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dropout
VOUT = 5 V FSW = 2.1 MHz FPWM mode Single Output
Figure 8-34 Dropout
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dropout
VOUT = 3.3 V FSW = 2.1 MHz FPWM mode Single Output
Figure 8-36 Dropout
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Start-Up With 100-mA Load
VOUT = 5 V FSW = 400 kHz FPWM mode
IOUT = 100 mA VIN = 13.5 V Dual Output
Figure 8-38 Start-Up With 100-mA Load
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Start-Up With 12-A Load
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 12 A VIN = 13.5 V Single Output
Figure 8-40 Start-Up With 12-A Load
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Short-Circuit Protection
VOUT1 = 3.3 V FSW = 400 kHz Auto mode
IOUT = 0 A to Short Circuit VIN = 13.5 V Dual Output
Figure 8-42 Short-Circuit Protection
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Short-Circuit Hiccup
VOUT = 3.3 V FSW = 400 kHz Auto mode
IOUT = Short Circuit to 0 A VIN = 13.5 V Dual Output
Figure 8-44 Short-Circuit Hiccup
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 5 V FSW = 400 kHz FPWM mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-46 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 5 V FSW = 400 kHz FPWM mode
IOUT = 3 A to 6 A to 3 A VIN = 13.5 V Dual Output
Figure 8-48 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 2.1 MHz Auto mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-50 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 100 mA to 6 A to 100 mA VIN = 13.5 V Dual Output
Figure 8-52 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 3 A to 6 A to 3 A VIN = 13.5 V Dual Output
Figure 8-54 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Load Transient
VOUT = 3.3 V FSW = 400 kHz FPWM mode
IOUT = 6 A to 12 A to 4 A VIN = 13.5 V Single Output
Figure 8-56 Load Transient
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Bicon Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 30 MHz to 200 MHz
Figure 8-58 Single Output Bicon Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Horn Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 1000 MHz to 2500 MHz
Figure 8-60 Single Output Horn Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Single Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 30 MHz to 108 MHz
Figure 8-62 Single Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Bicon Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 30 MHz to 200 MHz
Figure 8-64 Dual Output Bicon Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Horn Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 1000 MHz to 2500 MHz
Figure 8-66 Dual Output Horn Radiated Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
LMQ64480-Q1 LMQ644A0-Q1 LMQ644A2-Q1 Dual Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
VOUT = 3.3 V FSW = 2100 kHz IOUT = 12 A
Frequency Tested: 30 MHz to 108 MHz
Figure 8-68 Dual Output Conducted Emissions versus CISPR25 Class 5 Limits (Orange: Peak Signal, Red: Average Signal, Green: Quasi-Peak Signal)
Table 8-3 BOM for Typical Application Curves
VOUT FREQUENCY RFBB COUT EACH PHASE CIN + CHF EACH PHASE L CFFFOR ADJUSTABLE OUTPUT
3.3 V 400 kHz 32.4 kΩ 47 + 22 µF 2 × 10 µF + 1 × 100 nF 2.8 µH 10 pF
3.3 V 2200 kHz 32.4 kΩ 47 + 22 µF 2 × 10 µF + 1 × 100 nF 1 µH 10 pF
5 V 400 kHz 19.1 kΩ 47 + 22 µF 2 × 10 µF + 1 × 100 nF 2.8 µH 10 pF
5 V 2200 kHz 19.1 kΩ 47 + 22 µF 2 × 10 µF + 1 × 100 nF 1 µH 10 pF