SNVU698B September   2020  – December 2020 LMQ61460-Q1

 

  1.   1
  2.   Trademarks
  3. 1Introduction
    1. 1.1 LMQ61460-Q1 Synchronous Step-Down Voltage Converter
  4. 2Quick Start Guide
  5. 3Detailed Descriptions
  6. 4Schematic
    1. 4.1 Alternative BOM Configurations
  7. 5Board Layout
  8. 6LMQ61460EVM-400K Board Test Results
    1. 6.1 EMI
    2. 6.2 Board Efficiency
    3. 6.3 Load Regulation
    4. 6.4 Thermals
  9. 7Bill of Materials
  10. 8Revision History

LMQ61460-Q1 Synchronous Step-Down Voltage Converter

The LMQ61460-Q1 is an easy-to-use synchronous step-down DC/DC converter capable of delivering up to 6 A of load current from a supply voltage ranging from 3 V to 36 V. The LMQ61460-Q1 provides exceptional efficiency and output accuracy in a very small solution size. The LMQ61460-Q1 is capable of delivering 6 A of load current and implements peak current mode control. The following are additional features that provide both flexible and easy-to-use solutions for a wide range of applications:

  • Adjustable switching frequency (RT)
  • Synchronization to an external clock (CLK jumper)
  • FPWM variant (LMQ61460AFS) (IC swap)
  • Power-good flag (PG jumper)
  • Precision enable (EN jumper with RENT and RENB resistors)

Automatic frequency foldback at light load and optional external bias improve efficiency over the entire load range. The device requires few external components and has a pinout designed for optimal EMI and thermal performance. Protection features include the following:

  • Thermal shutdown
  • Input undervoltage lockout
  • Cycle-by-cycle current limiting
  • Hiccup short-circuit protection

For a quick reference, Figure 1-1 shows the pin configuration of the LMQ61460-Q1.

GUID-510B3C09-63D9-45F6-837B-36DD76DCA2C3-low.gifFigure 1-1 LMQ61460-Q1 Pin Configuration (Top View)