SLVUCX4 October   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 EVM Connections
    2. 2.2 Test Equipment
    3. 2.3 EVM Setup
      1. 2.3.1 Input Connections
      2. 2.3.2 Output Connections
      3. 2.3.3 Heat Sink Setup
  8. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency and Load Regulation Performance
      2. 3.1.2 Waveforms and Plots
      3. 3.1.3 EMI Performance
      4. 3.1.4 Thermal Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Trademarks
  11. 6Device and Documentation Support
    1. 6.1 Device Support
      1. 6.1.1 Development Support
        1. 6.1.1.1 Custom Design With WEBENCH® Tools
    2. 6.2 Documentation Support
      1. 6.2.1 Related Documentation

1.1 Introduction

The LM(Q)64480(-Q1), LM(Q)644A0(-Q1), and LM(Q)644A2(-Q1) Dual Buck DC/DC Converter family provides flexibility, scalability, and optimized solution size for a wide range of applications. With integrated power MOSFETs, the device is stackable up to 6 phases for higher output currents up to 36A, and uses a current-mode control architecture for easy loop compensation. The device supports input voltage surge up to 36V and dip as low as 3V. The switching frequency is adjustable from 100kHz to 2.2MHz using the RT pin and also can be synchronized to an external clock to eliminate beat frequencies in noise-sensitive applications. The output regulation target is programmed to a fixed 3.3V, 5V or adjustable using external feedback resistors. Available EMI mitigation features include spread spectrum and low package parasitic with enhanced QFN package. The QFN package has a cutout on the top exposing the converter semiconductor die allowing for heat sink (heat sink provided).

The switching frequency at the full load is programmed to 2.1MHz as a default. The switching mode at the light load is selectable between FPWM and AUTO mode. Also, spread spectrum can be enabled or disabled by a jumper selection. If an external pulse signal is applied to the SYNC pin, then the switching frequency is synchronized to the external clock.

CAUTION:
LM644A2QEVM-S2100T
Hot surface. Contact can cause burns. Do not touch.