SNAS879 December   2024 LMR60420

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

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

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.

LMR60420 Efficiency
Device type = 2A5V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-2 Efficiency
LMR60420 Dropout Voltage
Device type = 2A5V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-4 Dropout Voltage
LMR60420 1A to 2A Load Transient
Device type = 2A5V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-6 1A to 2A Load Transient
LMR60420 Shutdown Operation
Device type = 2A 5V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-8 Shutdown Operation
LMR60420 Short-Circuit Recovery
Device type = 2A 5V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-10 Short-Circuit Recovery
LMR60420 Load Regulation
Device type = 2A5V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-3 Load Regulation
LMR60420 0A to 2A Load Transient
Device type = 2A5V Fixed OutputMode = FPWM
FSW = 2MHz
Figure 8-5 0A to 2A Load Transient
LMR60420 Start-Up Operation
Device type = 2A 5V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-7 Start-Up Operation
LMR60420 Short-Circuit Applied
Device type = 2A 5V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-9 Short-Circuit Applied
LMR60420 Thermal Performance
Device type = 2A 5V Fixed Output Mode = FPWM
FSW = 2MHz
Figure 8-11 Thermal Performance