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 Typical Application

Figure 8-1 shows a typical application circuit for the LMR60460-Q1. This device is designed to function over a wide range of external components and system parameters. As a quick-start guide, Table 8-1 provides typical component values for some of the common configurations.

LMR60460-Q1 LMR60460-Q1 Reference Schematic
Option 1 To synchronize to an external clock, drive the MODE/SYNC pin directly from the clock.
Option 2 An appropriate voltage VMOD can be used at the MODE/SYNC to dynamically change between auto and FPWM modes.
Option 3 Ground the MODE/SYNC to run the device in auto mode.
Option 4 Connect the MODE/SYNC to RT to run the device in FPWM mode.
Figure 8-1 LMR60460-Q1 Reference Schematic

See also Section 7.3.4.

Table 8-1 Recommended Passive Components
FSW (kHz) VOUT (V) L (μH) COUT (μF)(1) RFBT (kΩ) RFBB (kΩ) CFF (pF) CIN (μF) CBOOT (nF) RRT (kΩ)
400 3.3 Fixed 3.3 2 × 47 SHUNT DNP DNP 2 × 4.7 + 1 × 0.1 100 86.6
400 3.3 Adj 3.3 2 × 47 100 43.2 10 2 × 4.7 + 1 × 0.1 100 86.6
400 5 Fixed 3.3 1 × 47 + 1 × 22 SHUNT DNP DNP 2 × 4.7 + 1 × 0.1 100 86.6
400 5 Adj 3.3 1 × 47 + 1 × 22 100 24.9 5 2 × 4.7 + 1 × 0.1 100 86.6
2000 3.3 Fixed 1 1 × 22 + 1 × 10 SHUNT DNP DNP 1 × 4.7 + 1 × 0.1 100 15
2000 3.3 Adj 1 1 × 22 + 1 × 10 100 43.2 5 1 × 4.7 + 1 × 0.1 100 15
2000 5 Fixed 1 1 × 22 + 1 × 10 SHUNT DNP DNP 1 × 4.7 + 1 × 0.1 100 15
2000 5 Adj 1 1 × 22 + 1 × 10 100 24.9 10 1 × 4.7 + 1 × 0.1 100 15
(1) Rated capacitance