Texas Instruments LM38020QEVM, User Manual

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User’s Guide
LMR38020QEVM User Guide
ABSTRACT
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
IN
) range
• 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
™
package to enable high-density, low-
component count DC/DC solutions. The LMR38020QEVM evaluation module is qualified for the LMR38020-Q1
as well as the LMR38020 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-Q1 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. LMR38020QEVM Top View....................................................................................................................................... 4
Figure 3-1. LMR38020QEVM 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. LMR38020QEVM 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
SNVU817 – NOVEMBER 2021
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