SNAS877 December   2024 LMR60440

PRODMIX  

  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 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 and Undervoltage Lockout (UVLO)
      2. 7.3.2 Soft Start and Recovery from Dropout
      3. 7.3.3 Frequency Selection With RT
      4. 7.3.4 MODE/SYNC Pin Control
      5. 7.3.5 Output Voltage Selection
      6. 7.3.6 Current Limit
      7. 7.3.7 Hiccup Mode
      8. 7.3.8 Power-Good Function
      9. 7.3.9 Spread Spectrum
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown
      2. 7.4.2 Active Mode
        1. 7.4.2.1 Continuous Conduction Mode (CCM)
        2. 7.4.2.2 Auto Mode - Light Load Operation
        3. 7.4.2.3 FPWM Operation - Light Load Operation
        4. 7.4.2.4 Minimum On-Time
        5. 7.4.2.5 Dropout
  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 Switching Frequency Selection
        2. 8.2.2.2 Inductor Selection
        3. 8.2.2.3 Output Capacitor Selection
        4. 8.2.2.4 Input Capacitor Selection
        5. 8.2.2.5 Bootstrap Capacitor (CBOOT) Selection
        6. 8.2.2.6 FB Voltage Divider for Adjustable Output Voltages
          1. 8.2.2.6.1 Feedforward Capacitor (CFF) Selection
        7. 8.2.2.7 RPG - PG Pullup Resistor
      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 Ground and Thermal Plane Considerations
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 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 Application Curves

The following characteristics apply to the circuit shown in Figure 8-1. These parameters are not tested and represent typical performance only. Unless otherwise stated, the following conditions apply: VIN = 13.5V, TA = 25°C.

LMR60440 Efficiency
Device type = 4A3.3V Fixed OutputMode = AUTO
FSW = 2MHz
Figure 8-2 Efficiency
LMR60440 Dropout Voltage
Device type = 4A3.3V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-4 Dropout Voltage
LMR60440 2A to 4A Load Transient
Device type = 4A 3.3V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-6 2A to 4A Load Transient
LMR60440 Shutdown Operation
Device type = 4A 3.3V Fixed Output Mode = AUTO
FSW = 2MHz
Figure 8-8 Shutdown Operation
LMR60440 Short-Circuit Recovery
Device type = 4A 3.3V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-10 Short-Circuit Recovery
LMR60440 Load Regulation
Device type = 4A3.3V Fixed OutputMode = AUTO
FSW = 2MHz
Figure 8-3 Load Regulation
LMR60440 20mA to 4A Load Transient
Device type = 4A 3.3V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-5 20mA to 4A Load Transient
LMR60440 Start-Up Operation
Device type = 4A 3.3V Fixed Output Mode = AUTO
FSW = 2MHz
Figure 8-7 Start-Up Operation
LMR60440 Short-Circuit Applied
Device type = 4A 3.3V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-9 Short-Circuit Applied
LMR60440 Thermal Performance
Device type = 4A 3.3V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-11 Thermal Performance