SNVSBW1C December   2021  – August 2024 LM63440-Q1 , LM63460-Q1

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1. 5.1 Wettable Flanks
    2. 5.2 Pinout Design for Clearance and FMEA
  7. 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 Timing Characteristics
    7. 6.7 Systems Characteristics
    8. 6.8 Typical Characteristics
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Range (VIN1, VIN2)
      2. 7.3.2  Output Voltage Setpoint (FB)
      3. 7.3.3  Precision Enable and Input Voltage UVLO (EN/SYNC)
      4. 7.3.4  Frequency Synchronization (EN/SYNC)
      5. 7.3.5  Clock Locking
      6. 7.3.6  Adjustable Switching Frequency (RT)
      7. 7.3.7  Power-Good Monitor (PGOOD)
      8. 7.3.8  Bias Supply Regulator (VCC, BIAS)
      9. 7.3.9  Bootstrap Voltage and UVLO (CBOOT)
      10. 7.3.10 Spread Spectrum
      11. 7.3.11 Soft Start and Recovery From Dropout
      12. 7.3.12 Overcurrent and Short-Circuit Protection
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 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 Foldback
        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. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1 – Automotive Synchronous 6A Buck Regulator at 2.1MHz
        1. 8.2.1.1 Design Requirements
      2. 8.2.2 Design 2 – Automotive Synchronous 4A Buck Regulator at 2.1MHz
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1  Custom Design With WEBENCH® Tools
          2. 8.2.2.2.2  Setting the Output Voltage
          3. 8.2.2.2.3  Choosing the Switching Frequency
          4. 8.2.2.2.4  Inductor Selection
          5. 8.2.2.2.5  Output Capacitor Selection
          6. 8.2.2.2.6  Input Capacitor Selection
          7. 8.2.2.2.7  Bootstrap Capacitor
          8. 8.2.2.2.8  VCC Capacitor
          9. 8.2.2.2.9  BIAS Power Connection
          10. 8.2.2.2.10 Feedforward Network
          11. 8.2.2.2.11 Input Voltage UVLO
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Design 3 – Automotive Synchronous 6A Buck Regulator at 400kHz
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Thermal Design and Layout
      2. 8.4.2 Layout Example
  10. Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    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
    1. 11.1 Tape and Reel Information

Package Options

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

Application Curves

Unless otherwise indicated, VIN = 13.5V, VOUT = 5V, IOUT = 6A, fSW = 2.1MHz, AUTO mode, and TA = 25°C. Figure 8-1 shows the circuit schematic with relevant BOM components specified in Table 8-10.

LM63440-Q1 LM63460-Q1 LM634x0-Q1 EfficiencyFigure 8-3 LM634x0-Q1 Efficiency
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Start-Up,6A Resistive LoadFigure 8-5 LM634x0-Q1 Start-Up,
6A Resistive Load
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Load Transient,IOUT = 3A to 6AFigure 8-7 LM634x0-Q1 Load Transient,
IOUT = 3A to 6A
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Short-Circuit HiccupFigure 8-9 LM634x0-Q1 Short-Circuit Hiccup
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Line
                        Transient and Recovery from DropoutFigure 8-11 LM634x0-Q1 Line Transient and Recovery from Dropout
LM63440-Q1 LM63460-Q1 Thermal Performance, 4A Load
76mm × 38mm, 4-layer PCB
Figure 8-13 Thermal Performance, 4A Load
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Conducted EMI,150kHz to
                        30MHzFigure 8-15 CISPR 25 Class 5 Conducted EMI,
150kHz to 30MHz
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Radiated EMI,Bicon Antenna,
                        Horizontal Polarization,30MHz to
                        200MHzFigure 8-17 CISPR 25 Class 5 Radiated EMI,
Bicon Antenna, Horizontal Polarization,
30MHz to 200MHz
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Radiated EMI,Log Antenna,
                        Horizontal Polarization,200MHz to 1GHzFigure 8-19 CISPR 25 Class 5 Radiated EMI,
Log Antenna, Horizontal Polarization,
200MHz to 1GHz
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Load and Line RegulationFigure 8-4 LM634x0-Q1 Load and Line Regulation
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Enable On and Off,6A Resistive LoadFigure 8-6 LM634x0-Q1 Enable On and Off,
6A Resistive Load
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Load Transient,IOUT = 0A to 6AFigure 8-8 LM634x0-Q1 Load Transient,
IOUT = 0A to 6A
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Short-Circuit Recovery to No
                        LoadFigure 8-10 LM634x0-Q1 Short-Circuit Recovery to No Load
LM63440-Q1 LM63460-Q1 LM634x0-Q1 Frequency Foldback in Dropout,
                            VIN = 3VFigure 8-12 LM634x0-Q1 Frequency Foldback in Dropout, VIN = 3V
LM63440-Q1 LM63460-Q1 Thermal Performance, 6A Load
76mm × 38mm, 4-layer PCB
Figure 8-14 Thermal Performance, 6A Load
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Conducted EMI,30MHz to
                        108MHzFigure 8-16 CISPR 25 Class 5 Conducted EMI,
30MHz to 108MHz
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Radiated EMI,Bicon Antenna,
                        Vertical Polarization,30MHz to 200MHzFigure 8-18 CISPR 25 Class 5 Radiated EMI,
Bicon Antenna, Vertical Polarization,
30MHz to 200MHz
LM63440-Q1 LM63460-Q1 CISPR
                        25 Class 5 Radiated EMI,Log Antenna, Vertical
                            Polarization,200MHz to 1GHzFigure 8-20 CISPR 25 Class 5 Radiated EMI,
Log Antenna, Vertical Polarization,
200MHz to 1GHz