SNVSD01 October   2026 LMR70410-Q1

ADVANCE INFORMATION  

  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 Fixed Frequency Peak Current Mode Control
      2. 7.3.2 Enable and Undervoltage Lockout
      3. 7.3.3 Soft Start and Recovery From Dropout
      4. 7.3.4 Adjustable Output Voltage
      5. 7.3.5 Minimum ON-Time, Minimum OFF-Time and Frequency Foldback
      6. 7.3.6 Bootstrap Voltage
      7. 7.3.7 Overcurrent and Short-Circuit Protection
      8. 7.3.8 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
      3. 7.4.3 CCM Mode
      4. 7.4.4 Light-Load Operation (PFM Version)
      5. 7.4.5 Light-Load Operation (FPWM Version)
  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 Output Voltage Setpoint
        2. 8.2.2.2 Switching Frequency
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Output Capacitor Selection
        5. 8.2.2.5 Input Capacitor Selection
        6. 8.2.2.6 Bootstrap Capacitor
        7. 8.2.2.7 Undervoltage Lockout Setpoint
        8. 8.2.2.8 Replacing Asynchronous Converter
      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 Compact Layout for EMI Reduction
        2. 8.4.1.2 Feedback Resistors
      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
    1. 11.1 Mechanical Data

3 Description

LMR70410-Q1 is a 40V, 1A synchronous buck switching regulator in an easy to use SOT23-6 package. LMR70410-Q1 can deliver up to 1A DC load current in a small design size and can operate between 4V to 40V DC supply voltage. LMR70410-Q1 operates at a fixed 2.1MHz switching frequency to support the use of relatively small inductors to optimize overall design size.

LMR70410-Q1 features precision enable UVLO which allows the designer to program the input voltage at which the device is turned on or off through the use of a resistor divider between VIN and GND. LMR70410-Q1 implements cycle-by-cycle overcurrent protection which limits the maximum output current even as the output voltage falls to zero. Thermal shutdown is implemented to turn off the LMR70410-Q1 if the junction temperature exceeds the thermal shutdown threshold.

LMR70410-Q1 features both FPWM and PFM variants allowing designs to be optimized for either fixed frequency across load or higher light load efficiency. The internal soft-start time is set internally to be 1.8ms (typical).

LMR70410-Q1 is part of a family of pin-to-pin devices that support load currents ranging from 0.6A to 1A. This family is pin-to-pin compatible with other SOT23-6 devices, such as TPS560430-Q1 and LMR50410-Q1.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LMR70410-Q1 DDC (SOT-23-THN, 6) 2.9mm × 2.8mm
(1) For more information, see Section 11.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LMR70410-Q1 Simplified Schematic Simplified Schematic