MAX20478

Name: MAX20478
Brand: Analog Devices
Price: 1.56 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

Two/Three-Input Automotive Voltage Monitor with Watchdog

Industry's Only Auto-Qualified, ASIL-D Power-System Monitor with Challenge/Response Watchdog

Data Sheet (Rev. 9) Product Selection Table

Part Models: 12
1ku List Price: Starting From $0.71

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Overview

Small Solution
- 2.35V to 5.50V Operating Supply Voltage
- Only One External Component Required
- 125µA Operating Current
High Precision
- Selectable 102.5% to 110% OV Monitors
- Selectable 97.5% to 90% UV Monitors
- ±0.8% Accuracy
- 0.5% Step Size
- ASIL D Compliance
Highly Integrated
- MAX20478A - Two Voltage Monitoring Inputs
- MAX20478B - Three Voltage Monitoring Inputs
- Windowed Watchdog
- OTP Configuration with Error-Correcting Code
- Programmable RESET1 and RESET2 Pins
10-Pin Side-Wettable TDFN with Exposed Pad (3mm x 3mm)
AEC-Q100 Qualified
-40°C to +125°C Operating Temperature

Part Models: 12
1ku List Price: Starting From $0.71

Documentation

Data Sheet 1

MAX20478: Two/Three-Input Automotive Voltage Monitor with Watchdog Data Sheet (Rev.9) 03/20/2025

Technical Articles 1

The Basics of Windowed Watchdogs 12/07/2021

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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX20478AATBA/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478AATBA/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478AATBC/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478AATBC/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBA/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBA/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBE/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBE/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBF/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBF/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBG/VY+	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20478BATBG/VY+T	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 5, 2026 - 2026-0072 DESIGN
		pcn_2026-0072
MAX20478AATBA/VY+	PRODUCTION
MAX20478AATBA/VY+T	PRODUCTION
MAX20478AATBC/VY+	PRODUCTION
MAX20478AATBC/VY+T	PRODUCTION
MAX20478BATBA/VY+	PRODUCTION
MAX20478BATBA/VY+T	PRODUCTION
MAX20478BATBE/VY+	PRODUCTION
MAX20478BATBE/VY+T	PRODUCTION
MAX20478BATBF/VY+	PRODUCTION
MAX20478BATBF/VY+T	PRODUCTION
MAX20478BATBG/VY+	PRODUCTION
MAX20478BATBG/VY+T	PRODUCTION
Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX20478AATBA/VY+	PRODUCTION
MAX20478AATBA/VY+T	PRODUCTION
MAX20478AATBC/VY+	PRODUCTION
MAX20478AATBC/VY+T	PRODUCTION
MAX20478BATBA/VY+	PRODUCTION
MAX20478BATBA/VY+T	PRODUCTION
MAX20478BATBE/VY+	PRODUCTION
MAX20478BATBE/VY+T	PRODUCTION
MAX20478BATBF/VY+	PRODUCTION
MAX20478BATBF/VY+T	PRODUCTION
MAX20478BATBG/VY+	PRODUCTION
MAX20478BATBG/VY+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX20478

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Features and Benefits

Single Supply Operation with 2.35V to 5.5V Input Supply Range
IN1-2 Voltage Monitor Channels Capable of Monitoring 0.5V to 3.6875V
IN3 Voltage Monitor Channel Capable of Monitoring 0.5V to 5.6V
OTP Controlled Voltage Monitoring with ECC
Selectable 102.5% to 110% OV Monitors
Selectable 97.5% to 90% UV Monitors
0.5% Step Size
0.8% Voltage Accuracy
ASIL-D Compliance (MAX20478)
ASIL-B Compliance (MAX20479)
Programmable Active-Low RESET1 and Active-Low RESET2 Pins
Jumpers and Test Points on Key Nodes for Simplified Evaluation
-40C° to +125C° Automotive Temperature Range
Automotive Grade External Components
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX20479 evaluation kit (EV kit) is a fully assembled and tested application circuit for the MAX20478/MAX20479: Two/ three input automotive voltage monitor with watchdog. The EV kit is created with automotive grade components and can test all functionality of the IC including watchdog and redundant supply monitoring. Various test points and jumpers are included to allow for various functionalities of the IC to be tested.

Applications

Advanced Driver-Assistance Systems
Autonomous Driving Processing Systems
Power System Supervision and Microcontroller Unit/System-on-a-Chip Monitoring
Remote Sensor Modules

Reference Designs

Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board - Top View

Automotive ASIL-D Compliant Power Delivery Board

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Features and Benefits

Xilinx Zynq^® UltraScale+™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.

Analog Devices, Inc. supports ASIL-D compliant automotive power delivery solutions for the Xilinx Zynq UltraScale+ MPSOC. The Knightrider board demonstrates the best-in-class power management supporting ASIL-D compliant solutions for functional safety.

Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and foot print.

ADI provides supporting documentation including power schematics, layout, LTpowerPlanner^® and applicable LTpowerPlay^® configuration files to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Key Power for full management devices are used as follows: