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

6.7 Typical Characteristics

VIN = 12 V, unless otherwise specified

LM5148-Q1 Efficiency vs Load
VOUT = 5 V FSW = 440 kHz
Figure 6-1 Efficiency vs Load
LM5148-Q1 Shutdown Current vs Temperature
VEN = 0 V
Figure 6-3 Shutdown Current vs Temperature
LM5148-Q1 Sleep2 Current vs Temperature
VVOUT = 5 V 1.03 V ≤ VEN ≤ 80 V
Figure 6-5 Sleep2 Current vs Temperature
LM5148-Q1 Fixed 5-V Output Voltage vs TemperatureFigure 6-7 Fixed 5-V Output Voltage vs Temperature
LM5148-Q1 PG OV Thresholds vs TemperatureFigure 6-9 PG OV Thresholds vs Temperature
LM5148-Q1 VCC Regulation Voltage vs TemperatureFigure 6-11 VCC Regulation Voltage vs Temperature
LM5148-Q1 VCC Current Limit vs TemperatureFigure 6-13 VCC Current Limit vs Temperature
LM5148-Q1 VDDA UVLO Thresholds vs TemperatureFigure 6-15 VDDA UVLO Thresholds vs Temperature
LM5148-Q1 Current Sense (CS) Threshold vs TemperatureFigure 6-17 Current Sense (CS) Threshold vs Temperature
LM5148-Q1 Minimum On Time (HO) vs TemperatureFigure 6-19 Minimum On Time (HO) vs Temperature
LM5148-Q1 Switching Frequency vs Temperature
RRT = 9.09 kΩ
Figure 6-21 Switching Frequency vs Temperature
LM5148-Q1 Efficiency vs Load, Log Scale
VOUT = 5 V FSW = 440 kHz
Figure 6-2 Efficiency vs Load, Log Scale
LM5148-Q1 Sleep1 Current vs Temperature
VVOUT = 3.3 V 1.03 V ≤ VEN ≤ 80 V
Figure 6-4 Sleep1 Current vs Temperature
LM5148-Q1 Fixed 3.3-V Output Voltage vs TemperatureFigure 6-6 Fixed 3.3-V Output Voltage vs Temperature
LM5148-Q1 Feedback Voltage vs TemperatureFigure 6-8 Feedback Voltage vs Temperature
LM5148-Q1 PG UV Thresholds vs TemperatureFigure 6-10 PG UV Thresholds vs Temperature
LM5148-Q1 VCC UVLO Thresholds vs TemperatureFigure 6-12 VCC UVLO Thresholds vs Temperature
LM5148-Q1 VDDA Regulation Voltage vs TemperatureFigure 6-14 VDDA Regulation Voltage vs Temperature
LM5148-Q1 VCCX On, Off Thresholds vs TemperatureFigure 6-16 VCCX On, Off Thresholds vs Temperature
LM5148-Q1 Current Sense (CS) Amplifier Gain vs TemperatureFigure 6-18 Current Sense (CS) Amplifier Gain vs Temperature
LM5148-Q1 Soft-Start Time vs TemperatureFigure 6-20 Soft-Start Time vs Temperature