4 Channel Antenna LDO Reference Design with Digital Diagnostics and Integrated Protection
TIDA-01569
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Key Document

Description

This automotive reference design demonstrates an approach for powering remote, off-board loads, often over coaxial cables (i.e. "phantom power"). This design is capable of protecting against and digitally diagnosing different faults that off-board cabling is susceptible to. Reverse polarity, reverse current, short to-battery, short-to-ground, and thermal shutdown are protected against and diagnosed through I2C and a fault flag. The integrated reverse-current protection does not require an external diode at the output of the device, which saves cost and avoids increasing the dropout voltage.

Features
  • 4.5V to 40V wide input voltage range and load dump of 45V
  • Multiplexing current sense between channels/devices to save ADC channels
  • High accuracy to detect antenna open, normal, over current, and short circuit conditions over current/short circuit
  • Digital window comparator with programmable high & low thresholds and alert
  • Output voltage adjustable 1.5 - 20V, output current up to 300 mA per channel

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7142  12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
TPS7B69-Q1  Automotive 150-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7B7702-Q1  Automotive 300-mA, off-battery (40-V), dual-channel adjustable antenna low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7142 Download Download
TPS7B69-Q1 Download
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TPS7B7702-Q1 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1165 04 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 2064 08 Feb 2018
ZIP 753 08 Feb 2018
PDF 779 08 Feb 2018
PDF 96 08 Feb 2018
PDF 66 08 Feb 2018
PDF 193 08 Feb 2018

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