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Analog Devices Inc./Maxim Integrated MAX20478AATBA/VY+
- Part No.:
- MAX20478AATBA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478AATBA/VY+.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
MAX20478AATBA/VY+ from Analog Devices is an ASIL D-compliant automotive voltage monitor SoC with two configurable voltage inputs (IN1, IN2), programmable OV/UV thresholds (±0.8% accuracy), windowed watchdog, and operating supply range 2.35V–5.50V. It supports advanced driver-assistance systems requiring high-reliability power supervision at -40°C to +125°C.
For engineers reviewing the MAX20478AATBA/VY+ datasheet, MAX20478AATBA/VY+ pinout, MAX20478AATBA/VY+ application, or MAX20478AATBA/VY+ equivalent, key selection factors include ASIL D compliance, dual-input voltage monitoring resolution (12.5mV steps), OTP-configurable reset timing, side-wettable 10-pin TDFN package, and AEC-Q100 qualification for automotive safety-critical subsystems.
Technical Context
The MAX20478AATBA/VY+ implements a fully integrated analog monitoring architecture with independent OV/UV comparators per input, precision internal reference (VREF), and a windowed watchdog timer with WDI input and WDDIS control. Its OTP memory includes ECC for configuration integrity.
It supports two voltage monitor inputs (IN1, IN2) each configurable from 0.5V–3.6875V in 12.5mV steps, ±0.8% threshold accuracy, and selectable OV (102.5%–110%) and UV (90%–97.5%) trip points - all validated across -40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.35V to 5.50V - supports direct connection to automotive 3.3V or 5V rails without external regulators |
| Input Voltage Range (IN1/IN2) | 0.5V to 3.6875V in 12.5mV steps - enables precise monitoring of core logic, I/O, or sensor supply voltages |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection within tight automotive safety margins |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and ADAS ECU environments |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems |
| Watchdog Type | Windowed - prevents false resets during transient noise while detecting stuck or stalled firmware |
Pinout & Package
MAX20478AATBA/VY+ is housed in a 10-pin side-wettable TDFN (3mm × 3mm) with exposed thermal pad, optimized for automated optical inspection (AOI) and solder joint reliability in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers internal analog/digital blocks and reference circuitry |
| GND | Ground reference | Common return path for all analog and digital functions; connects to exposed pad |
| IN1, IN2 | Monitor input channels | High-impedance analog inputs for configurable OV/UV detection on two independent rails |
| RESET1, RESET2 | Open-drain reset outputs | Programmable active-low reset signals with independent timeout and polarity control |
| WDI | Watchdog input | Edge-sensitive input that must be toggled within window period to prevent watchdog timeout |
| WDDIS | Watchdog disable control | Active-high signal to temporarily suspend watchdog function during safe firmware transitions |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated fault coverage and diagnostic coverage per ISO 26262 for use in safety-critical automotive domains |
| OTP with ECC | One-time-programmable configuration memory with error-correcting code ensures robust startup settings against bit flips |
| Side-wettable TDFN | 10-pin 3mm × 3mm package enables AOI-compatible solder joint inspection for zero-defect automotive manufacturing |
| Single external component | Only requires one external capacitor for VREF stabilization - reduces BOM count and layout area |
| Programmable reset timing | RESET1/RESET2 pulse widths and delays configured via OTP - eliminates need for external RC networks |
Applications
| Advanced Driver-Assistance Systems (ADAS) | Autonomous Driving Processing Units |
|---|---|
Use Scenario: Real-time monitoring of camera module power rails and SoC core supplies in forward-facing ADAS ECUs. IC Role / Device Role / Timing Role: Dual-rail voltage supervisor ensuring safe shutdown before undervoltage-induced image corruption or frame loss. Use Value: Prevents false object detection by guaranteeing clean power sequencing and deterministic reset behavior during cold cranking. | Use Scenario: Supervision of AI accelerator and memory supply domains in L3/L4 autonomous compute platforms. IC Role / Device Role / Timing Role: Independent OV/UV detection on multiple voltage domains with synchronized reset assertion to halt unsafe execution. Use Value: Enables ISO 26262-compliant fail-safe response when any monitored rail deviates beyond ±0.8% accuracy window. |
| Remote Sensor Modules | Power System Supervision |
Use Scenario: Compact battery-powered radar or LiDAR nodes requiring ultra-low quiescent current and high-temperature operation. IC Role / Device Role / Timing Role: Primary voltage health monitor with windowed watchdog guarding MCU firmware execution. Use Value: 125µA operating current extends battery life; side-wettable TDFN ensures long-term solder joint integrity in vibration-prone mounting locations. | Use Scenario: Centralized power management in domain controllers supervising multiple DC-DC converters and microcontrollers. IC Role / Device Role / Timing Role: Configurable dual-input supervisor coordinating system-level reset propagation across heterogeneous subsystems. Use Value: Reduces discrete component count by replacing two separate voltage monitors and a standalone watchdog IC in single-package solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477AATBA/VY+ | Single-input variant; identical package, supply, temperature, and watchdog features | Limited to one monitored rail; insufficient for dual-rail ADAS SoC supervision | Select MAX20478AATBA/VY+ when two independent voltage domains require simultaneous OV/UV monitoring |
| TPS65381A-Q1 | Three-input monitor with integrated watchdog but no OTP configuration; fixed thresholds only | Lacks programmable reset timing and ±0.8% accuracy - limited to less stringent ASIL B systems | Choose MAX20478AATBA/VY+ for ASIL D designs requiring field-programmable thresholds and ECC-protected OTP |
Compared with MAX20477AATBA/VY+ and TPS65381A-Q1, the MAX20478AATBA/VY+ uniquely delivers ASIL D-compliant dual-rail monitoring with programmable thresholds, windowed watchdog, and OTP+ECC - enabling safer, more flexible power supervision in next-generation ADAS and autonomous ECUs.
Availability
MAX20478AATBA/VY+ is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving processing units, and remote sensor modules requiring stable component supply with full automotive qualification traceability.
Supply support for MAX20478AATBA/VY+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for industrial, automotive, communications, and consumer applications.
The MAX20478 product line delivers ASIL D-compliant, highly integrated power supervisors targeting safety-critical automotive subsystems such as ADAS domain controllers and autonomous compute platforms.
FAQ
What is the maximum number of voltage inputs supported by the MAX20478AATBA/VY+?
The MAX20478AATBA/VY+ supports exactly two voltage monitor inputs (IN1 and IN2), both configurable from 0.5V to 3.6875V in 12.5mV steps. It is the 'A' variant of the MAX20478 family - distinct from the three-input MAX20478B. This dual-input capability is fixed in hardware and cannot be extended via configuration.
Does the MAX20478AATBA/VY+ meet AEC-Q100 requirements?
Yes, the MAX20478AATBA/VY+ is AEC-Q100 qualified for Grade 0 (-40°C to +150°C junction) and operates over ambient -40°C to +125°C. Full qualification documentation, including HTOL, TC, and ESD test reports, is available under NDA from Analog Devices - confirming compliance for automotive front-end and under-hood applications.
How is the watchdog function implemented in the MAX20478AATBA/VY+?
The MAX20478AATBA/VY+ implements a windowed watchdog with dedicated WDI input and WDDIS control pin. The watchdog requires periodic edge transitions on WDI within a programmable time window; failure triggers RESET1/RESET2 assertion. WDDIS allows temporary watchdog suspension during known-safe firmware transitions without compromising overall safety integrity.
What package type does the MAX20478AATBA/VY+ use, and why is it significant for automotive use?
The MAX20478AATBA/VY+ uses a 10-pin side-wettable TDFN (3mm × 3mm) with exposed thermal pad. This package enables automated optical inspection (AOI) of solder joints - a critical requirement for zero-defect manufacturing in automotive electronics - and provides superior thermal performance and mechanical reliability under thermal cycling and vibration stress.
Can the OV/UV thresholds of the MAX20478AATBA/VY+ be adjusted after manufacturing?
No - threshold values and reset timing parameters for the MAX20478AATBA/VY+ are programmed once into OTP memory during final test. The OTP includes ECC for data integrity, and reprogramming is not supported. Configuration is locked at shipment, ensuring consistent, tamper-resistant behavior across the device lifetime in safety-critical systems.
MAX20478AATBA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478AATBA/VY+ FAQ
1.How can I place an order for MAX20478AATBA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478AATBA/VY+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX20478AATBA/VY+ reliable?
The price and inventory of MAX20478AATBA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478AATBA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20478AATBA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478AATBA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478AATBA/VY+?
MAX20478AATBA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478AATBA/VY+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX20478AATBA/VY+?
For technical support, including MAX20478AATBA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478AATBA/VY+ requirements.
6.How does Aetrix verify that MAX20478AATBA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20478AATBA/VY+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX20478AATBA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20478AATBA/VY+?
All MAX20478AATBA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478AATBA/VY+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX20478AATBA/VY+ part is unused and in its original packaging.
Return procedure for MAX20478AATBA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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