SNVSC00A February   2023  – January 2025 LM5148-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  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 Thermal Information
    6. 6.6 Electrical 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  Input Voltage Range (VIN)
      2. 7.3.2  High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
      3. 7.3.3  Precision Enable (EN)
      4. 7.3.4  Power-Good Monitor (PG)
      5. 7.3.5  Switching Frequency (RT)
      6. 7.3.6  Dual Random Spread Spectrum (DRSS)
      7. 7.3.7  Soft Start
      8. 7.3.8  Output Voltage Setpoint (FB)
      9. 7.3.9  Minimum Controllable On Time
      10. 7.3.10 Error Amplifier and PWM Comparator (FB, EXTCOMP)
      11. 7.3.11 Slope Compensation
      12. 7.3.12 Inductor Current Sense (ISNS+, VOUT)
        1. 7.3.12.1 Shunt Current Sensing
        2. 7.3.12.2 Inductor DCR Current Sensing
      13. 7.3.13 Hiccup Mode Current Limiting
      14. 7.3.14 High-Side and Low-Side Gate Drivers (HO, LO)
      15. 7.3.15 Output Configurations (CNFG)
      16. 7.3.16 Single-Output Dual-Phase Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Sleep Mode
      2. 7.4.2 Pulse Frequency Modulation and Synchronization (PFM/SYNC)
      3. 7.4.3 Thermal Shutdown
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Power Train Components
        1. 8.1.1.1 Buck Inductor
        2. 8.1.1.2 Output Capacitors
        3. 8.1.1.3 Input Capacitors
        4. 8.1.1.4 Power MOSFETs
        5. 8.1.1.5 EMI Filter
      2. 8.1.2 Error Amplifier and Compensation
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1 – High Efficiency 2.1MHz Synchronous Buck Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design with WEBENCH® Tools
          2. 8.2.1.2.2 Custom Design with Excel Quickstart Tool
          3. 8.2.1.2.3 Buck Inductor
          4. 8.2.1.2.4 Current-Sense Resistance
          5. 8.2.1.2.5 Output Capacitors
          6. 8.2.1.2.6 Input Capacitors
          7. 8.2.1.2.7 Frequency Set Resistor
          8. 8.2.1.2.8 Feedback Resistors
          9. 8.2.1.2.9 Compensation Components
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2 – High Efficiency 48-V to 12-V 400-kHz Synchronous Buck Regulator
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Design 3 – High Efficiency 440-kHz Synchronous Buck Regulator
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
      4. 8.2.4 Design 4 – Dual-Phase 400-kHz 20-A Synchronous Buck Regulator
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
        3. 8.2.4.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Power Stage Layout
        2. 8.4.1.2 Gate-Drive Layout
        3. 8.4.1.3 PWM Controller Layout
        4. 8.4.1.4 Thermal Design and Layout
        5. 8.4.1.5 Ground Plane Design
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Custom Design with WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
        1. 9.2.1.1 PCB Layout Resources
        2. 9.2.1.2 Thermal Design Resources
    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

8.2.3.3 Application Curves

LM5148-Q1 Efficiency vs IOUT
5-V output
Figure 8-29 Efficiency vs IOUT
LM5148-Q1 Full Load Switching
10-A resistive load
Figure 8-31 Full Load Switching
LM5148-Q1 Line Transient Response to VIN = 40 V
VIN ramps from 12 to 40 V 5-A load
Figure 8-33 Line Transient Response to VIN = 40 V
LM5148-Q1 Start-Up Characteristic
VIN step to 12 V 10-A resistive load
Figure 8-35 Start-Up Characteristic
LM5148-Q1 Load Transient, 0 A to 10 A
VIN = 12 V FPWM
Figure 8-37 Load Transient, 0 A to 10 A
LM5148-Q1 Efficiency vs IOUT, Log Scale
5-V output
Figure 8-30 Efficiency vs IOUT, Log Scale
LM5148-Q1 PFM Switching
No load
Figure 8-32 PFM Switching
LM5148-Q1 Cold-Crank Response to VIN = 4 V
VIN falls to 4 V 1-A load
Figure 8-34 Cold-Crank Response to VIN = 4 V
LM5148-Q1 ENABLE ON and OFF Characteristic
VIN = 12 V 10-A resistive load
Figure 8-36 ENABLE ON and OFF Characteristic
LM5148-Q1 Load Transient, 5 A to 10 A
VIN = 12 V FPWM
Figure 8-38 Load Transient, 5 A to 10 A