SNAS894B July   2025  – December 2025 LMR60460-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 Auto Mode Operation
        2. 7.4.2.2 Continuous Conduction Mode (CCM)
        3. 7.4.2.3 FPWM 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 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
    1. 11.1 Tape and Reel 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 = 25°C.

Table 8-4 BOM for application curves
Device Output Voltage Switching Frequency Inductor Output Capacitance(1)
LMR60460-Q1 3.3V 400kHz 3.3μH, 6.5mΩ max 78μF
LMR60460-Q1 5V 400kHz 3.3μH, 6.5mΩ max 50μF
LMR60460-Q1 3.3V 2MHz 1μH, 9mΩ max 28μF
LMR60460-Q1 5V 2MHz 1μH, 9mΩ max 26μF
(1) Derated capacitance value when COUT is DC biased.
LMR60460-Q1 Efficiency - Auto Mode
VOUT = 3.3V Fsw = 400kHz Mode = Auto
Figure 8-2 Efficiency - Auto Mode
LMR60460-Q1 Efficiency - Auto Mode
VOUT = 5V Fsw = 400kHz Mode = Auto
Figure 8-4 Efficiency - Auto Mode
LMR60460-Q1 Efficiency - Auto Mode
VOUT = 3.3V Fsw = 2MHz Mode = Auto
Figure 8-6 Efficiency - Auto Mode
LMR60460-Q1 Efficiency - Auto Mode
VOUT = 5V Fsw = 2MHz Mode = Auto
Figure 8-8 Efficiency - Auto Mode
LMR60460-Q1 Load and Line Regulation - Auto Mode
VOUT = 3.3V Fsw = 400kHz Mode = Auto
Figure 8-10 Load and Line Regulation - Auto Mode
LMR60460-Q1 Load and Line Regulation - Auto Mode
VOUT = 5V Fsw = 400kHz Mode = Auto
Figure 8-12 Load and Line Regulation - Auto Mode
LMR60460-Q1 Load and Line Regulation - Auto Mode
VOUT = 3.3V Fsw = 2MHz Mode = Auto
Figure 8-14 Load and Line Regulation - Auto Mode
LMR60460-Q1 Load and Line Regulation - Auto Mode
VOUT = 5V Fsw = 2MHz Mode = Auto
Figure 8-16 Load and Line Regulation - Auto Mode
LMR60460-Q1 Dropout Curve
VOUT = 3.3V Fsw = 400Hz Mode = Auto
Figure 8-18 Dropout Curve
LMR60460-Q1 Dropout Curve
VOUT = 3.3V Fsw = 2MHz Mode = Auto
Figure 8-20 Dropout Curve
LMR60460-Q1 Output Current versus Maximum Ambient Temperature
VOUT = 3.3V Fsw = 400kHz LMR60460QEVM, No air flow
Figure 8-22 Output Current versus Maximum Ambient Temperature
LMR60460-Q1 Load Transient
VIN = 12V VOUT = 3.3V Mode = FPWM
Fsw = 400kHz IOUT = 0A to 6A
Figure 8-24 Load Transient
LMR60460-Q1 Load Transient
VIN = 12V VOUT = 3.3V Mode = FPWM
Fsw = 2MHz IOUT = 0A to 6A
Figure 8-26 Load Transient
LMR60460-Q1 Steady-State Switching Waveform and Output Voltage Ripple
VIN = 12V VOUT = 5V Mode = Auto
Fsw = 400kHz IOUT = 50mA
Figure 8-28 Steady-State Switching Waveform and Output Voltage Ripple
LMR60460-Q1 Enable Start-Up and Shutdown With 50mA Load
VIN = 12V VOUT = 5V Mode = Auto
Fsw = 400kHz IOUT = 50mA
Figure 8-30 Enable Start-Up and Shutdown With 50mA Load
LMR60460-Q1 Short-Circuit Behavior
VIN = 12V VOUT = 5V Mode = FPWM
Fsw = 400kHz IOUT = 0A
Figure 8-32 Short-Circuit Behavior
LMR60460-Q1 SYNC frequency transient
VIN = 12V VOUT = 3.3V IOUT = 6A
FSW changes from 1.4MHz to 0.8MHz
Figure 8-34 SYNC frequency transient
LMR60460-Q1 Conducted EMI vs CISPR 25 Limits (Pink: Peak Signal, Green: Average Signal)
VIN = 12V VOUT = 5V Fsw = 400kHz
IOUT = 6A EMI filter
Figure 8-36 Conducted EMI vs CISPR 25 Limits (Pink: Peak Signal, Green: Average Signal)
LMR60460-Q1 Radiated EMI (Bicon Horizontal) vs CISPR 25 Limits
VIN = 12V VOUT = 3.3V Fsw = 400kHz
IOUT = 6A
Figure 8-38 Radiated EMI (Bicon Horizontal) vs CISPR 25 Limits
LMR60460-Q1 Radiated EMI (Log Periodic Horizontal) vs CISPR 25 Limits
VIN = 12V VOUT = 3.3V Fsw = 400kHz
IOUT = 6A
Figure 8-40 Radiated EMI (Log Periodic Horizontal) vs CISPR 25 Limits
LMR60460-Q1 Recommended input EMI filterFigure 8-42 Recommended input EMI filter
LMR60460-Q1 Efficiency - FPWM Mode
VOUT = 3.3V Fsw = 400kHz Mode = FPWM
Figure 8-3 Efficiency - FPWM Mode
LMR60460-Q1 Efficiency - FPWM Mode
VOUT = 5V Fsw = 400kHz Mode = FPWM
Figure 8-5 Efficiency - FPWM Mode
LMR60460-Q1 Efficiency - FPWM Mode
VOUT = 3.3V Fsw = 2MHz Mode = FPWM
Figure 8-7 Efficiency - FPWM Mode
LMR60460-Q1 Efficiency - FPWM Mode
VOUT = 5V Fsw = 2MHz Mode = FPWM
Figure 8-9 Efficiency - FPWM Mode
LMR60460-Q1 Load and Line Regulation - FPWM Mode
VOUT = 3.3V Fsw = 400kHz Mode = FPWM
Figure 8-11 Load and Line Regulation - FPWM Mode
LMR60460-Q1 Load and Line Regulation - FPWM Mode
VOUT = 5V Fsw = 400kHz Mode = FPWM
Figure 8-13 Load and Line Regulation - FPWM Mode
LMR60460-Q1 Load and Line Regulation - FPWM Mode
VOUT = 3.3V Fsw = 2MHz Mode = FPWM
Figure 8-15 Load and Line Regulation - FPWM Mode
LMR60460-Q1 Load and Line Regulation - FPWM Mode
VOUT = 5V Fsw = 2MHz Mode = FPWM
Figure 8-17 Load and Line Regulation - FPWM Mode
LMR60460-Q1 Dropout Curve
VOUT = 5V Fsw = 400kHz Mode = Auto
Figure 8-19 Dropout Curve
LMR60460-Q1 Dropout Curve
VOUT = 5V Fsw = 2MHz Mode = Auto
Figure 8-21 Dropout Curve
LMR60460-Q1 Typical no-load standby quiescent current vs input voltage
LMR60460 TA = 25°C VEN = VIN
Figure 8-23 Typical no-load standby quiescent current vs input voltage
LMR60460-Q1 Load Transient
VIN = 12V VOUT = 5V Mode = FPWM
Fsw = 400kHz IOUT = 0A to 6A
Figure 8-25 Load Transient
LMR60460-Q1 Load Transient
VIN = 12V VOUT = 5V Mode = FPWM
Fsw = 2MHz IOUT = 0A to 6A
Figure 8-27 Load Transient
LMR60460-Q1 Steady-State Switching Waveform and Output Voltage Ripple
VIN = 12V VOUT = 5V Mode = FPWM
Fsw = 400kHz IOUT = 6A
Figure 8-29 Steady-State Switching Waveform and Output Voltage Ripple
LMR60460-Q1 Enable Start-Up and Shutdown With 6A Load
VIN = 12V VOUT = 5V Mode = FPWM
Fsw = 400kHz IOUT = 6A
Figure 8-31 Enable Start-Up and Shutdown With 6A Load
LMR60460-Q1 SYNC frequency transient
VIN = 12V VOUT = 3.3V IOUT = 6A
FSW changes from 0.8MHz to 1.4MHz
Figure 8-33 SYNC frequency transient
LMR60460-Q1 Conducted EMI vs CISPR 25 Limits (Pink: Peak Signal, Green: Average Signal)
VIN = 12V VOUT = 3.3V Fsw = 2MHz
IOUT = 6A EMI filter
Figure 8-35 Conducted EMI vs CISPR 25 Limits (Pink: Peak Signal, Green: Average Signal)
LMR60460-Q1 Radiated EMI (Monopole) vs CISPR 25 Limits
VIN = 12V VOUT = 3.3V Fsw = 400kHz
IOUT = 6A
Figure 8-37 Radiated EMI (Monopole) vs CISPR 25 Limits
LMR60460-Q1 Radiated EMI (Bicon Vertical) vs CISPR 25 Limits
VIN = 12V VOUT = 3.3V Fsw = 400kHz
IOUT = 6A
Figure 8-39 Radiated EMI (Bicon Vertical) vs CISPR 25 Limits
LMR60460-Q1 Radiated EMI (Log Periodic Vertical) vs CISPR 25 Limits
VIN = 12V VOUT = 3.3V Fsw = 400kHz
IOUT = 6A
Figure 8-41 Radiated EMI (Log Periodic Vertical) vs CISPR 25 Limits
LMR60460-Q1 EVM Thermal Performance
VIN = 12V VOUT = 5V Fsw = 400kHz
IOUT = 6A
Figure 8-43 EVM Thermal Performance