SLUUD23 September   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 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Test Equipment
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Line and Load Regulation, Efficiency
  8. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 EVM Characteristics
      2. 3.1.2 Conversion Efficiency
      3. 3.1.3 Operating Waveforms
        1. 3.1.3.1 Start-Up with EN
        2. 3.1.3.2 Start-Up with VIN
        3. 3.1.3.3 Load Transient Response
        4. 3.1.3.4 Output Voltage Ripple
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Compliance Information
    1. 5.1 Compliance and Certifications
  11. 6Additional Information
    1. 6.1 Trademarks
  12. 7Related Documentation

1.1 Introduction

The LMR51603 is a single, PCM control mode, synchronous buck converter requiring a very low external component count. This user's guide describes the characteristics, operation, performance, and use of the Texas Instruments' LMR51603 evaluation module (EVM). This user's guide includes the following:

  • Setup instructions for the hardware
  • Printed-circuit board layouts for the EVM
  • Schematic diagram
  • Bills of material
  • Test results for the EVM

The LMR51603 synchronous buck converter used in the EVM has the following features:

  • Wide input voltage range: 5.5V – 65V (absolute maximum = 70V)
  • Fixed frequency with 1.1MHz
  • Support 300mA continuous output current
  • 26.5uA low quiescent current
  • ±1.5% output voltage accuracy at 25°C
  • 80ns minimum switching on time
  • Short-circuit protection with hiccup mode
  • Forced PWM and PFM options