Texas Instruments LP87745-Q1, Руководство пользователя

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User’s Guide
LP877451Q1EVM Evaluation Module
ABSTRACT
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.
CAUTION
Hot surface.
Contact may cause burns.
Do not touch!
Table of Contents
1 Top View with Basic External Connections .......................................................................................................................... 2
2 Input, Output Voltages, and Load Current Requirements ................................................................................................... 3
3 Jumpers and connectors ....................................................................................................................................................... 4
3.1 Test Points.......................................................................................................................................................................... 6
4 Getting Started ........................................................................................................................................................................ 8
4.1 GUI..................................................................................................................................................................................... 8
4.2 GUI Installation and working with GUI............................................................................................................................... 8
5 Watchdog ............................................................................................................................................................................... 12
6 Schematics, Layout and BOM ............................................................................................................................................. 14
6.1 Schematic Diagram.......................................................................................................................................................... 15
6.2 PCB Layer Diagram......................................................................................................................................................... 18
6.3 Components List.............................................................................................................................................................. 18
7 Revision History ................................................................................................................................................................... 22
List of Figures
Figure 1-1. EVM Top-View Diagram With Basic Connections and Default Jumpers................................................................... 2
Figure 4-1. GUI Front Page......................................................................................................................................................... 9
Figure 4-2. GUI Configuration Page.......................................................................................................................................... 10
Figure 4-3. GUI Register Map Page........................................................................................................................................... 11
Figure 5-1. Watchdog Sequence in Q&A Mode......................................................................................................................... 12
Figure 5-2. GUI Watchdog Validation Configuration ................................................................................................................. 13
Figure 5-3. GUI Watchdog Configuration .................................................................................................................................. 13
Figure 6-1. PMIC Schematic...................................................................................................................................................... 15
Figure 6-2. Preregulator Schematic........................................................................................................................................... 16
Figure 6-3. MCU Schematic...................................................................................................................................................... 17
www.ti.com Table of Contents
SNVU769A – SEPTEMBER 2021 – REVISED OCTOBER 2022
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