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 Typical Application

For the circuit schematic, bill of materials, PCB layout files, and test results of an LMQ664x0-Q1 implementation see the LMQ66430-Q1 EVM. As a quick-start guide, Table 8-1 and Table 8-4 provide typical component values for a range of the most common output voltages.

Table 8-1 Typical External Component Values for Adjustable Output LMQ66430-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (kΩ)(3) RFBB (kΩ) CIN CBOOT CVCC CFF(4)
400 3.3 10 3 × 22µF 60µF 33.2 14.3 4.7µF DNP 1µF 100pF
2200 3.3 2.2 3 × 22µF 60µF 33.2 14.3 4.7µF DNP 1µF DNP
400 5 10 3 × 22µF 60µF 49.9 12.4 4.7µF DNP 1µF 100pF
2200 5 2.2 3 × 22µF 60µF 49.9 12.4 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) For RFBT and RFBB values outside the range stated above, see Section 8.2.1.2.2.1.
(4) See Section 8.2.1.2.8 for more information.
Table 8-2 Typical External Component Values for Adjustable Output LMQ66420-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (kΩ)(3) RFBB (kΩ) CIN CBOOT CVCC CFF(4)
400 3.3 6.8 3 × 22µF 60µF 33.2 14.3 4.7µF DNP 1µF 100pF
2200 3.3 2.2 2 × 22µF 40µF 33.2 14.3 4.7µF DNP 1µF DNP
400 5 6.8 3 × 22µF 60µF 49.9 12.4 4.7µF DNP 1µF 100pF
2200 5 2.2 2 × 22µF 40µF 49.9 12.4 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) For RFBT and RFBB values outside the range stated above, see Section 8.2.1.2.2.1.
(4) See Section 8.2.1.2.8 for more information.
Table 8-3 Typical External Component Values for Adjustable Output LMQ66410-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (kΩ)(3) RFBB (kΩ) CIN CBOOT CVCC CFF(4)
400 3.3 22 2 × 22µF 40µF 33.2 14.3 4.7µF DNP 1µF 100pF
2200 3.3 4.7 1 × 22µF 20µF 33.2 14.3 4.7µF DNP 1µF DNP
400 5 22 2 × 22µF 40µF 49.9 12.4 4.7µF DNP 1µF 100pF
2200 5 4.7 1 × 22µF 20µF 49.9 12.4 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) For RFBT and RFBB values outside the range stated above, see Section 8.2.1.2.2.1.
(4) See Section 8.2.1.2.8 for more information.
Table 8-4 Typical External Component Values for Fixed Output LMQ66430-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (Ω) RFBB (Ω)(3) CIN CBOOT CVCC CFF
400 3.3 10 3 × 22µF 60µF 0 DNP 4.7µF DNP 1µF DNP
2200 3.3 2.2 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
400 5 10 3 × 22µF 60µF 0 DNP 4.7µF DNP 1µF DNP
2200 5 2.2 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) DNP = Do Not Populate.
Table 8-5 Typical External Component Values for Fixed Output LMQ66420-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (kΩ) RFBB (kΩ)(3) CIN CBOOT CVCC CFF
400 3.3 6.8 3 × 22µF 60µF 0 DNP 4.7µF DNP 1µF DNP
2200 3.3 2.2 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
400 5 6.8 3 × 22µF 60µF 0 DNP 4.7µF DNP 1µF DNP
2200 5 2.2 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) DNP = Do Not Populate.
Table 8-6 Typical External Component Values for Fixed Output LMQ66410-Q1
ƒSW (kHz)(1) VOUT (V) L (µH) Nominal COUT (Rated Capacitance) Minimum COUT(Effective Capacitance)(2) RFBT (kΩ) RFBB (kΩ)(3) CIN CBOOT CVCC CFF
400 3.3 22 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
2200 3.3 4.7 1 × 22µF 20µF 0 DNP 4.7µF DNP 1µF DNP
400 5 22 2 × 22µF 40µF 0 DNP 4.7µF DNP 1µF DNP
2200 5 4.7 1 × 22µF 20µF 0 DNP 4.7µF DNP 1µF DNP
(1) Inductor values are calculated based on typical VIN = 12V.
(2) Minimum COUT values take into account the effects of DC bias voltage and temperature on the actual capacitance value.
(3) DNP = Do Not Populate.