SLUSFS7 September   2024 LMR51603-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 Fixed Frequency Peak Current Mode Control
      2. 7.3.2 Adjustable Output Voltage
      3. 7.3.3 Enable
      4. 7.3.4 Minimum ON Time, Minimum OFF Time, and Frequency Foldback
      5. 7.3.5 Bootstrap Voltage
      6. 7.3.6 Overcurrent and Short-Circuit Protection
      7. 7.3.7 Soft Start
      8. 7.3.8 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
      3. 7.4.3 CCM Mode
      4. 7.4.4 Light Load Operation (PFM Version)
      5. 7.4.5 Light-Load Operation (FPWM Version)
  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 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Output Voltage Setpoint
        3. 8.2.2.3 Switching Frequency
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Output Capacitor Selection
        6. 8.2.2.6 Input Capacitor Selection
        7. 8.2.2.7 Bootstrap Capacitor
        8. 8.2.2.8 Undervoltage Lockout Setpoint
        9. 8.2.2.9 Replacing Non Sync Buck Converter
      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 Compact Layout for EMI Reduction
        2. 8.4.1.2 Feedback Resistors
      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. 9.1.2 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

6.7 Typical Characteristics

VIN = 24V, fSW= 400kHz, TA = 25°C, unless otherwise specified

LMR51603-Q1 3.3V PFM Efficiency Versus Load Current
fSW = 400kHzVOUT = 3.3VLMR51603X-Q1
Figure 6-1 3.3V PFM Efficiency Versus Load Current
LMR51603-Q1 5V PFM Efficiency Versus Load Current
fSW = 400kHzVOUT = 5VLMR51603X-Q1
Figure 6-3 5V PFM Efficiency Versus Load Current
LMR51603-Q1 5V load Regulation
fSW = 400kHzVOUT = 5VLMR51603X-Q1
Figure 6-5 5V load Regulation
LMR51603-Q1 VIN Quiescent Current Versus TemperatureFigure 6-7 VIN Quiescent Current Versus Temperature
LMR51603-Q1 Reference Voltage Versus TemperatureFigure 6-9 Reference Voltage Versus Temperature
LMR51603-Q1 3.3V FPWM Efficiency Versus Load Current
fSW = 400kHzVOUT = 3.3VLMR51603XF-Q1
Figure 6-2 3.3V FPWM Efficiency Versus Load Current
LMR51603-Q1 5V FPWM Efficiency Versus Load Current
fSW = 400kHzVOUT = 5VLMR51603XF-Q1
Figure 6-4 5V FPWM Efficiency Versus Load Current
LMR51603-Q1 3.3V Load Regulation
fSW = 400kHzVOUT = 3.3VLMR51603X-Q1
Figure 6-6 3.3V Load Regulation
LMR51603-Q1 VIN UVLO Versus TemperatureFigure 6-8 VIN UVLO Versus Temperature
LMR51603-Q1 HS and LS Current Limit Versus TemperatureFigure 6-10 HS and LS Current Limit Versus Temperature