Texas Instruments LMR38025QEVM User Manual

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User's Guide
LMR38025QEVM User's Guide
The LMR38025QEVM is an 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
LMR38025SQDRRRQ1 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 LMR38025-Q1 converter is available in an 12-pin WSON integrated circuit package to enable high-density,
low-component count DC/DC designs. The LMR38025QEVM evaluation module is qualified for the LMR38025-
Q1 as well as the LMR38025 buck converter. See
CONVERTER
U1
1 General TI High Voltage Evaluation User Safety Guidelines..............................................................................................
2 LMR38025-Q1 Evaluation Module.........................................................................................................................................
2.1 Quick Start Procedure........................................................................................................................................................5
2.2 Detailed Descriptions.........................................................................................................................................................
3 EVM Photo...............................................................................................................................................................................8
4 Schematic................................................................................................................................................................................9
5 PCB Layout............................................................................................................................................................................10
6 Bill of Materials.....................................................................................................................................................................
7 Performance Curves.............................................................................................................................................................14
Figure 2-1. LMR38025Q EVM
Figure 3-1. LMR38025Q EVM
Figure 4-1. LMR38025Q Schematic............................................................................................................................................
Figure 5-1. Top Layer and Silkscreen Layer..............................................................................................................................
Figure 5-2. Mid-Layer 1 Ground
Figure 5-3. Mid-Layer 2 Routing................................................................................................................................................
Figure 5-4. Bottom Layer Routing..............................................................................................................................................12
Figure 7-1. Efficiency vs Load
Figure 7-2. Load Regulation......................................................................................................................................................
Figure 7-3. Start-Up: V = 48 V, V
IN
Figure 7-4. Full Load Switching: V
Figure 7-5. Load Transient: V
Figure 7-6. Line Transient: V
Figure 7-7. Control Loop Response: V
SNVU848 - NOVEMBER 2023
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ABSTRACT
) range
IN
Table 1-1
Table 1-1. Device and Package Configurations
IC
LMR38025-Q1
LMR38025

Table of Contents

List of Figures
Setup...........................................................................................................................................5
Photo...........................................................................................................................................8
Plane.......................................................................................................................................11
Current.......................................................................................................................................14
= 5 V, I = 2.5 A........................................................................................................
OUT OUT
= 48 V, V = 5 V, I
IN OUT
= 48 V, V = 5 V, I = 250 mA to 2.25 A at 200 mA/µs.....................................................
IN OUT OUT
= 10 V to 70 V at 200 V/ms, V
IN
= 48 V, V = 5 V, I
IN OUT
Copyright © 2023 Texas Instruments Incorporated
for package information.
PACKAGE
12-pin WSON package (3.00 mm × 3.00 mm)
= 2.5 A.......................................................................................14
OUT
= 5 V, I = 2.5 A..............................................................
OUT OUT
= 2.5 A................................................................................
OUT
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