SNAS871B July   2025  – August 2026 LMR60406-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  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
      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 Operation - 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 Applications 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 Versions
          1. 8.2.2.6.1 Feedforward Capacitor (CFF) Selection
        7. 8.2.2.7 RPU - PGOOD Pullup Resistor
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Plane Considerations
      2. 8.5.2 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 Device Nomenclature
    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

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 = 12V, TA = 25ºC.

LMR60406-Q1 Efficiency
Device Type = 0.6A 5V output Mode = FPWM
Fsw = 2MHz
Figure 8-2 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 5V output Mode = FPWM
Fsw = 400kHz
Figure 8-4 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 3.3V output Mode = FPWM
Fsw = 2MHz
Figure 8-6 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 3.3V output Mode = FPWM
Fsw = 400kHz
Figure 8-8 Efficiency
LMR60406-Q1 Dropout Voltage
Device type = 0.6A 3.3V output Mode = FPWM
Fsw = 2MHz
Figure 8-10 Dropout Voltage
LMR60406-Q1 Load Regulation
Device Type = 0.6A 3.3V output Mode = FPWM
Fsw = 2MHz
Figure 8-12 Load Regulation
LMR60406-Q1 Start-up
Figure 8-14 Start-up
LMR60406-Q1 0A to 0.6A Load Transient
Device type = 0.6A 3.3V output Mode = FPWM
Fsw = 2MHz
Figure 8-16 0A to 0.6A Load Transient
LMR60406-Q1 0A to 0.6A Load Transient
Device type = 0.6A 5V output Mode = FPWM
Fsw = 2MHz
Figure 8-18 0A to 0.6A Load Transient
LMR60406-Q1 Steady State Waveform
Device type = 0.6A 5V output Mode = AUTO
Fsw = 2MHz IOUT = 0.6A
Figure 8-20 Steady State Waveform
LMR60406-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60410QEVM
VOUT = 5V FSW = 2MHz IOUT = 0.6A
Frequency span: 150kHz to 30MHz
Figure 8-22 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60410QEVM
LMR60406-Q1 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Monopole Antenna, LMR60410QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 1A
Frequency span: 150kHz to 30MHz
Figure 8-24 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Monopole Antenna, LMR60410QEVM
LMR60406-Q1 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Vertical Biconical Antenna, LMR60410QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 1A
Frequency span: 30MHz to 200MHz
Figure 8-26 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Vertical Biconical Antenna, LMR60410QEVM
LMR60406-Q1 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Vertical Logarithmic Antenna, LMR60410QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 1A
Frequency span: 200MHz to 1GHz
Figure 8-28 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Vertical Logarithmic Antenna, LMR60410QEVM
LMR60406-Q1 Efficiency
Device Type = 0.6A 5V output Mode = AUTO
Fsw = 2MHz
Figure 8-3 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 5V output Mode = AUTO
Fsw = 400kHz
Figure 8-5 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 3.3V output Mode = AUTO
Fsw = 2MHz
Figure 8-7 Efficiency
LMR60406-Q1 Efficiency
Device Type = 0.6A 3.3V output Mode = AUTO
Fsw = 400kHz
Figure 8-9 Efficiency
LMR60406-Q1 Dropout
Device Type = 0.6A 5V output Mode = FPWM
Fsw = 2MHz
Figure 8-11 Dropout
LMR60406-Q1 Input current vs load current under light-load condition
3.3V fixed output Fsw = 2MHz Mode = AUTO
Figure 8-13 Input current vs load current under light-load condition
LMR60406-Q1 Shutdown
Figure 8-15 Shutdown
LMR60406-Q1 0.3A to 0.6A Load Transient
Device type = 0.6A 3.3V output Mode = FPWM
Fsw = 2MHz
Figure 8-17 0.3A to 0.6A Load Transient
LMR60406-Q1 0.3A to 0.6A Load Transient
Device type = 0.6A 5V output Mode = FPWM
Fsw = 2MHz
Figure 8-19 0.3A to 0.6A Load Transient
LMR60406-Q1 Steady State Waveform
Device type = 0.6A 5V output Mode = AUTO
IOUT = 0.01A
Figure 8-21 Steady State Waveform
LMR60406-Q1 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60410QEVM
VOUT = 5V FSW = 2MHz IOUT = 0.6A
Frequency span: 30MHz to 108MHz
Figure 8-23 Conducted EMI versus CISPR25 Limits (Purple: Peak Signal, Green: Average Signal), LMR60410QEVM
LMR60406-Q1 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Horizontal Biconical Antenna, LMR60410QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 1A
Frequency span: 30MHz to 200MHz
Figure 8-25 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Horizontal Biconical Antenna, LMR60410QEVM
LMR60406-Q1 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Horizontal Logarithmic Antenna, LMR60410QEVM
VOUT = 3.3V FSW = 2MHz IOUT = 1A
Frequency span: 200MHz to 1GHz
Figure 8-27 Radiated EMI versus CISPR25 Limits (Yellow: Peak Signal, Red: Quasipeak Signal, Green: Average Signal), Horizontal Logarithmic Antenna, LMR60410QEVM
LMR60406-Q1 Typical Input EMI Filter Schematic Figure 8-29 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
LMR60406-Q1 Example Application Circuit Figure 8-30 Example Application Circuit
Table 8-6 BOM for Typical Applications Curves
U1 FSW (kHz) VOUT (V) L1 (μH) NOMINAL COUT (μF) RT (kΩ)
LMR604065SRAKRQ1 2000 5 10 1 × 10 + 1 × 4.7 15.2