Texas Instruments LM38020QEVM User Manual

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User's Guide
LMR38020QEVM User Guide
The LM38020QEVM is a 80-V DC/DC buck regulator that employs synchronous rectification to achieve high
conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 6 V to 80 V to
provide a regulated 5-V output at 400-kHz switching frequency. The output voltage has better than 1.5% setpoint
accuracy and is adjustable using an external resistor divider. The module design uses the LMR38020S-Q1
synchronous buck converter with the following:
• Wide input voltage (wide V
• Wide duty-cycle range
• Integrated high-side and low-side power MOSFETs
• Cycle-by-cycle overcurrent protection
• Spread spectrum
The LMR38020S-Q1 converter is available in an 8-pin SO PowerPAD
component count DC/DC solutions. The LMR38020QEVM evaluation module is qualified for the LMR38020-Q1
as well as the LMR38020 buck converter. See
CONVERTER
U1
1 General TI High Voltage Evaluation User Safety Guidelines..............................................................................................
2 LMR38020-Q1 Evaluation Module.........................................................................................................................................
2.1 Quick Start Procedure........................................................................................................................................................4
2.2 Detailed Descriptions.........................................................................................................................................................
3 Schematic................................................................................................................................................................................7
4 PCB Layout..............................................................................................................................................................................8
5 Bill of Materials......................................................................................................................................................................11
Figure 2-1. LMR38020QEVM Top
Figure 3-1. LMR38020QEVM Schematic....................................................................................................................................
Figure 4-1. Top Layer and Silkscreen Layer................................................................................................................................
Figure 4-2. Mid-Layer 1 Ground Plane........................................................................................................................................
Figure 4-3. Mid-Layer 2 Routing..................................................................................................................................................
Figure 4-4. Bottom Layer Routing..............................................................................................................................................10
Table 1-1. Device and Package
Table 5-1. LMR38020QEVM Bill of
Trademarks
PowerPAD ™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
SNVU817 - NOVEMBER 2021
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ABSTRACT
) range
IN
Table 1-1

Table 1-1. Device and Package Configurations

IC
LMR38020-Q1
8-pin SO package with PowerPAD (4.89 mm × 3.90 mm)
LMR38020

Table of Contents

List of Figures
View.......................................................................................................................................4
List of Tables
Configurations...........................................................................................................................1
Materials.............................................................................................................................11
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LMR38020QEVM User Guide 1