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User's Guide
LP877451Q1EVM Evaluation Module
The LP87745-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs
in various automotive and industrial radar applications. The device has three step-down DC/DC converters,
a 5 V boost converter and a 1.8 V/3.3 V LDO. The LDO is powered from the boost and intended for xWR
and peripheral devices IO supply. The device is controlled by an SPI serial interface and by enable signal.
The step-down DC/DC converters support programmable switching frequency of 17.6 MHz, 8.8 MHz or 4.4
MHz and have low noise across wide frequency range which enables LDO-free power solution with minimal
or no additional passive filtering. LP87745-Q1 device offers flexible external component selection to optimize
the solution in terms of performance or cost. The features of the device target safety-relevant applications with
system-safety requirements up to ASIL-C level.
This user's guide provides instructions to power up and evaluate LP87745-Q1 device using the
LP877451Q1EVM evaluation module (EVM) and software user interface (LP87745-Q1 GUI). By default
LP877451Q1EVM has LP877451A1RXVRQ1 device OTP version (17.6 MHz, Low noise use case BOM), but
this EVM can also be used to evaluate another OTP device from LP8774x-Q1 product family.
3 Jumpers and connectors.......................................................................................................................................................
Points..........................................................................................................................................................................6
Started........................................................................................................................................................................8
4.1
GUI.....................................................................................................................................................................................8
5
Watchdog...............................................................................................................................................................................12
6 Schematics, Layout and BOM.............................................................................................................................................
Diagram..........................................................................................................................................................15
6.2 PCB Layer Diagram.........................................................................................................................................................
6.3 Components List..............................................................................................................................................................
7 Revision History...................................................................................................................................................................
Figure 4-1. GUI Front Page.........................................................................................................................................................
Figure 4-2. GUI Configuration Page..........................................................................................................................................
Schematic......................................................................................................................................................15
Schematic...........................................................................................................................................16
Figure 6-3. MCU Schematic......................................................................................................................................................
SNVU769A - SEPTEMBER 2021 - REVISED OCTOBER 2022
ABSTRACT
Contact may cause burns.
Table of Contents
Connections..........................................................................................................................2
Requirements...................................................................................................3
List of Figures
Page...........................................................................................................................................11
Mode.........................................................................................................................12
..................................................................................................................................13
Copyright © 2022 Texas Instruments Incorporated
CAUTION
Hot surface.
Do not touch!
Table of Contents
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