Texas Instruments LMR38020EVM, User Manual

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User’s Guide
LMR38020EVM User Guide
ABSTRACT
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
IN
) range, wide duty-cycle range, integrated high-
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
™
package to enable high density, low component count DC/DC
solutions. The LMR38020EVM evaluation module is qualified for the LMR38020 as well as the LMR38020-Q1
buck converter. See
Table 1-1 for package information.
Table 1-1. Device and Package Configurations
CONVERTER IC PACKAGE
U1
LMR38020-Q1
8-pin SO package with PowerPAD (4.89 mm × 3.90 mm)
LMR38020
Table of Contents
1 General TI High Voltage Evaluation User Safety Guidelines .............................................................................................. 2
2 LMR38020 Evaluation Module ............................................................................................................................................... 4
2.1 Quick Start Procedure........................................................................................................................................................ 4
2.2 Detailed Descriptions......................................................................................................................................................... 5
3 Schematic ................................................................................................................................................................................ 7
4 PCB Layout .............................................................................................................................................................................. 8
5 Bill of Materials ...................................................................................................................................................................... 11
List of Figures
Figure 2-1. LMR38020EVM Top View.......................................................................................................................................... 4
Figure 3-1. LMR38020EVM Schematic....................................................................................................................................... 7
Figure 4-1. Top Layer and Silkscreen Layer................................................................................................................................ 8
Figure 4-2. Mid-Layer 1 Ground Plane........................................................................................................................................ 9
Figure 4-3. Mid-Layer 2 Routing.................................................................................................................................................. 9
Figure 4-4. Bottom Layer Routing.............................................................................................................................................. 10
List of Tables
Table 1-1. Device and Package Configurations........................................................................................................................... 1
Table 5-1. LMR38020EVM Bill of Materials................................................................................................................................ 11
Trademarks
PowerPAD ™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
www.ti.com Table of Contents
SNVU787 – JULY 2021
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