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1 Introduction
1.1 LMR51450 Synchronous Step-Down Voltage Converter
The LMR51450 device is an easy-to-use synchronous step-down DC/DC converter capable of driving up to 5 A
of load current from a supply voltage ranging from 4 V to 36 V. The LMR51450 provides very high efficiency and
output accuracy in a very small solution size. The LMR51450 is capable of delivering 5 A of load current and
is peak current mode controlled. The following are additional features that provide both flexible and easy-to-use
solutions for a wide range of applications:
•
Adjustable switching frequency
•
FPWM variant (LMR51450FNDRRR)
•
Power-good flag
•
Precision enable
Automatic frequency foldback at light load improves efficiency over the entire load range. The device requires
few external components and PFM variant integrates Spread Spectrum for optimal EMI. Protection features
include the following:
•
Thermal shutdown
•
Input undervoltage lockout
•
Cycle-by-cycle current limiting
•
Hiccup short-circuit protection
The LMR51450 device is pin-to-pin compatible with the LMR51440 for easy output current scaling.
For a quick reference,
Figure 1-1
simplified schematic. See the
Sheet
for more detailed feature descriptions and design guide.
Figure 1-1. LMR51450 Pin Configuration (Top View)
1.2 LMR51450 Evaluation Module
The LMR51450 EVM has the board populated with the LMR51450SDRRR and limiting current to 5 A and comes
with auto mode enabled.
SNVU838A – OCTOBER 2022 – REVISED NOVEMBER 2022
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shows the pin configuration of the LMR51450 and
LMR51450 4-V to 36-V, 5-A, Synchronous Step-Down DC/DC Converter Data
Copyright © 2022 Texas Instruments Incorporated
Figure 1-2
Figure 1-2. LMR51450 Schematic
Introduction
shows the
LMR51450 EVM
3
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