SNAS875A February   2025  – June 2025 LMR60430-Q1

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

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.

LMR60430-Q1 Efficiency
Device type = 3A 3.3V fixed output Mode = Auto/FPWM
FSW = 2MHz
Figure 8-2 Efficiency
LMR60430-Q1 Efficiency
Device type = 3A 3.3V fixed output Mode = Auto/FPWM
FSW = 400kHz
Figure 8-4 Efficiency
LMR60430-Q1 Dropout Voltage
Device type = 3A 3.3V fixed output Mode = FPWM
FSW = 2MHz
Figure 8-6 Dropout Voltage
LMR60430-Q1 Load Regulation
Device type = 3A 3.3V fixed output Mode = Auto
FSW = 2MHz
Figure 8-8 Load Regulation
LMR60430-Q1 1.5A to 3A Load Transient
Device type = 3A3.3V fixed outputMode = FPWM
FSW = 2MHz
Figure 8-10 1.5A to 3A Load Transient
LMR60430-Q1 Shutdown Operation
Device type = 3A3.3V fixed outputMode = Auto
FSW = 2MHz
Figure 8-12 Shutdown Operation
LMR60430-Q1 Short-Circuit Recovery
Device type = 3A3.3V fixed outputMode = FPWM
FSW = 2MHz
Figure 8-14 Short-Circuit Recovery
LMR60430-Q1 Steady State Waveform

Device type = 3A 3.3V fixed output Mode = Auto
IOUT = 100mA FSW = 2MHz Light load operation

Figure 8-16 Steady State Waveform
LMR60430-Q1 Thermal Performance
Device type = 3A 5V fixed output Mode = Auto
FSW = 2MHz
Figure 8-18 Thermal Performance
LMR60430-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 3A
Frequency tested: 150kHz to 30MHz
Figure 8-20 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
LMR60430-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
VOUT = 5V FSW = 2MHz IOUT = 3A
Frequency tested: 150kHz to 30MHz
Figure 8-22 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
LMR60430-Q1 Efficiency
Device type = 3A 5V fixed output Mode = Auto/FPWM
FSW = 2MHz
Figure 8-3 Efficiency
LMR60430-Q1 Efficiency
Device type = 3A 5V fixed output Mode = Auto/FPWM
FSW = 400kHz
Figure 8-5 Efficiency
LMR60430-Q1 Dropout
Device type = 3A 5V fixed output Mode = FPWM
FSW = 2MHz
Figure 8-7 Dropout
LMR60430-Q1 20mA to 3A Load Transient
Device type = 3A3.3V fixed outputMode = FPWM
FSW = 2MHz
Figure 8-9 20mA to 3A Load Transient
LMR60430-Q1 Start-Up Operation
Device type = 3A3.3V fixed outputMode = Auto
FSW = 2MHz
Figure 8-11 Start-Up Operation
LMR60430-Q1 Short-Circuit Applied
Device type = 3A3.3V fixed outputMode = FPWM
FSW = 2MHz
Figure 8-13 Short-Circuit Applied
LMR60430-Q1 Steady State Waveform

Device type = 3A 3.3V fixed output Mode = Auto
IOUT = 3A FSW = 2MHz Continuous conduction mode

Figure 8-15 Steady State Waveform
LMR60430-Q1 Thermal Performance
Device type = 3A 3.3V fixed output Mode = Auto
FSW = 2MHz
Figure 8-17 Thermal Performance
LMR60430-Q1 Thermal Performance
Device type = 3A 5V fixed output Mode = Auto
FSW = 400kHz
Figure 8-19 Thermal Performance
LMR60430-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 3A
Frequency tested: 30MHz to 108MHz
Figure 8-21 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
LMR60430-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
VOUT = 5V FSW = 2MHz IOUT = 3A
Frequency tested: 30MHz to 108MHz
Figure 8-23 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60440QEVM
LMR60430-Q1 Typical Input EMI Filter Schematic Figure 8-24 Typical Input EMI Filter Schematic
Table 8-5 Typical EMI Filter Components
FSW(kHz) CFILT1(μF) CFILT2(μF) CFILT3(μF) CFILT4(μF) LFILT(μH) CBULK(μF)
2000 2.2 2.2 DNP DNP 2.2 47
LMR60430-Q1 Example Application Circuit Figure 8-25 Example Application Circuit
Table 8-6 BOM for Typical Applications Curves
U1 FSW (kHz) VOUT L1 (μH) NOMINAL COUT (μF) RT(kΩ)
LMR604305SRAKRQ1 2000 5 1.5 1 × 22 16.5
LMR604303SRAKRQ1 2000 3.3 1.5 1 × 22 16.5