Texas Instruments LMR38020EVM User Manual

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User's Guide
LMR38020EVM User Guide
The LMR38020EVM 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 LMR38020F
synchronous buck converter with wide input voltage (wide V
side and low-side power MOSFETs, cycle-by-cycle overcurrent protection, and precision enable. The LMR38020
converter is available in an 8-pin SO PowerPAD
solutions. The LMR38020EVM evaluation module is qualified for the LMR38020 as well as the LMR38020-Q1
buck converter. See Table 1-1
CONVERTER
U1
1 General TI High Voltage Evaluation User Safety Guidelines..............................................................................................
2 LMR38020 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. LMR38020EVM Top
Figure 3-1. LMR38020EVM 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. LMR38020EVM Bill of
Trademarks
PowerPAD ™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
SNVU787 - JULY 2021
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ABSTRACT
™ package to enable high density, low component count DC/DC
for package information.

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
Copyright © 2021 Texas Instruments Incorporated
) range, wide duty-cycle range, integrated high-
IN
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LMR38020EVM User Guide 1