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Analog Devices Inc./Maxim Integrated MAX20478BATBF/VY+T
- Part No.:
- MAX20478BATBF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBF/VY+T.pdf
- Description:
- MAX20478BATBF/VY+T
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
MAX20478BATBF/VY+T from Analog Devices is a three-input ASIL D-compliant automotive voltage monitor IC with integrated windowed watchdog, programmable OV/UV thresholds (±0.8% accuracy), 2.35V–5.50V supply range, and operation from –40°C to +125°C. It monitors up to three rail voltages-Inputs 1 & 2 (0.5V–3.6875V in 12.5mV steps), Input 3 (0.5V–5.6V in 20mV steps)-and asserts RESET1/RESET2 for system safety-critical supervision in ADAS ECUs.
For engineers reviewing the MAX20478BATBF/VY+T datasheet, MAX20478BATBF/VY+T pinout, MAX20478BATBF/VY+T application, or MAX20478BATBF/VY+T equivalent, key selection criteria include ASIL D compliance, triple-rail monitoring granularity, windowed watchdog timing configurability, OTP-based configuration integrity, and AEC-Q100 qualification for under-hood deployment.
Technical Context
The MAX20478BATBF/VY+T implements a fully integrated, OTP-configured monitoring architecture with independent threshold programming per input channel and a windowed watchdog that requires periodic WDI toggling within configurable upper/lower time bounds. Its internal reference (VREF) enables high-precision comparisons without external components.
It supports two distinct monitoring modes: dual-input (MAX20478A) and triple-input (MAX20478B); MAX20478BATBF/VY+T is the latter variant, with all three inputs active and factory-programmed for 12.5mV/20mV step resolution, ±0.8% threshold accuracy, and 102.5%–110% OV / 90%–97.5% UV ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitoring Inputs | Three independent analog inputs: IN1/IN2 (0.5V–3.6875V, 12.5mV step), IN3 (0.5V–5.6V, 20mV step) |
| OV/UV Threshold Accuracy | ±0.8% - enables tight margining for safety-critical rail validation without calibration |
| Supply Voltage Range | 2.35V to 5.50V - compatible with 3.3V and 5V automotive domains and post-regulator rails |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and ADAS ECU placement |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems |
| Watchdog Type | Windowed - detects both stuck-high and stuck-low WDI signals, preventing false resets |
| AEC-Q100 Grade | Grade 0 - certified for full automotive temperature range and stress testing |
Pinout & Package
MAX20478BATBF/VY+T is housed in a 10-pin side-wettable TDFN package (3mm × 3mm) with exposed thermal pad, optimized for automated optical inspection (AOI) and solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers internal regulators and comparators |
| GND | Ground reference | Common return for analog and digital sections; connects to exposed pad |
| IN1, IN2, IN3 | Analog voltage inputs | High-impedance inputs for rail monitoring; IN1/IN2 support 12.5mV steps, IN3 supports 20mV steps |
| RESET1, RESET2 | Open-drain reset outputs | Programmable assertion on OV/UV fault; each can be independently enabled/disabled |
| WDI | Watchdog input | Accepts windowed toggle signal; failure to meet timing window triggers reset |
| WDDIS | Watchdog disable control | Active-low pin to permanently disable watchdog function during debug or safe mode |
| REF | Internal reference output | Provides stable 1.25V reference for external circuitry or calibration |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Architecturally verified for ISO 26262 ASIL D systems via fault injection, redundancy, and diagnostic coverage reporting |
| OTP with ECC | Factory-programmed configuration stored in one-time-programmable memory with error-correcting code for immunity to bit flips |
| No external components required | Single 0.1µF bypass capacitor suffices; eliminates BOM cost and layout area vs. discrete supervisor solutions |
| Side-wettable TDFN | Enables AOI-compatible solder joint inspection-critical for zero-defect automotive manufacturing |
| Programmable reset polarity | Each RESETx output can be configured as active-high or active-low via OTP settings |
Applications
| ADAS Domain Controller Supervision | Autonomous Driving SoC Power Monitoring |
|---|---|
Use Scenario: Real-time voltage supervision of GPU, AI accelerator, and sensor fusion SoC rails in L2+/L3 ADAS domain controllers. IC Role / Device Role / Timing Role: Triple-rail monitor asserting RESET1 on core VDD violation and RESET2 on I/O supply fault, with windowed watchdog guarding firmware execution. Use Value: Enables deterministic fail-safe shutdown before logic corruption occurs, meeting ASIL D fault reaction time requirements. | Use Scenario: Continuous monitoring of 12V-to-3.3V/1.8V/0.8V power tree in autonomous driving compute modules. IC Role / Device Role / Timing Role: Simultaneous OV/UV detection across primary, auxiliary, and core rails; REF pin provides traceable reference for ADC-based secondary validation. Use Value: Reduces need for multiple discrete supervisors, cutting PCB area by >65% and eliminating inter-IC timing skew. |
| Remote Radar Sensor Module | Automotive Gateway Microcontroller Supervision |
Use Scenario: Compact voltage and watchdog supervision in millimeter-wave radar modules mounted near front bumper. IC Role / Device Role / Timing Role: Monitors 5V analog supply, 3.3V digital rail, and 1.2V PLL supply; WDDIS pin allows watchdog disable during low-power sleep states. Use Value: Ensures reliable wake-up and fault containment in thermally constrained environments with no additional thermal margin needed. | Use Scenario: Safety-critical reset generation and watchdog management for gateway MCUs handling CAN FD, Ethernet, and LIN traffic. IC Role / Device Role / Timing Role: Generates synchronized RESET1/RESET2 pulses aligned to MCU boot sequence; windowed watchdog prevents silent firmware lockup. Use Value: Guarantees deterministic recovery from communication stack hangs without requiring host CPU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477BATBF/VY+T | Dual-input variant (IN1/IN2 only); lacks IN3 monitoring capability and associated 20mV-step resolution | Suitable only for two-rail systems; cannot replace triple-input requirement in MAX20478BATBF/VY+T designs | Select only if system has exactly two monitored supplies and space/power constraints favor identical footprint |
| TPS65381A-Q1 | Integrated PMIC with voltage monitors, but no windowed watchdog; OV/UV accuracy ±1.5%, no OTP configuration | Targets power management + basic supervision; not certified for ASIL D standalone monitoring | Use where combined regulation and coarse supervision suffice, but not for ASIL D–mandated independent monitoring |
Compared with MAX20478BATBF/VY+T, MAX20477BATBF/VY+T reduces monitoring scope to two inputs and omits IN3's extended range, while TPS65381A-Q1 trades ASIL D–grade precision and watchdog robustness for integrated DC/DC functionality-neither offers drop-in replacement capability.
Availability
MAX20478BATBF/VY+T 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 and long-term lifecycle support.
Supply support for MAX20478BATBF/VY+T 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, serving automotive, industrial, communications, and healthcare markets.
The MAX20478 family delivers ASIL D–compliant, highly integrated voltage supervision for next-generation automotive ECUs-designed specifically to replace multi-chip discrete monitoring solutions in safety-critical domains.
FAQ
What is the ASIL D compliance status of MAX20478BATBF/VY+T?
MAX20478BATBF/VY+T is architecturally compliant with ISO 26262 ASIL D requirements, validated through fault injection analysis, built-in self-test coverage, and diagnostic reporting. Its OTP memory includes ECC, and internal redundancy ensures detection of single-point faults. The MAX20478BATBF/VY+T datasheet documents diagnostic coverage metrics and FMEDA results required for functional safety integration.
How many voltage inputs does MAX20478BATBF/VY+T support, and what are their ranges?
MAX20478BATBF/VY+T supports three voltage inputs: IN1 and IN2 monitor 0.5V–3.6875V in 12.5mV steps; IN3 monitors 0.5V–5.6V in 20mV steps. All inputs feature independently programmable OV/UV thresholds with ±0.8% accuracy. This triple-input capability distinguishes MAX20478BATBF/VY+T from dual-input variants like MAX20477BATBF/VY+T.
Does MAX20478BATBF/VY+T include a watchdog timer, and what type is it?
Yes, MAX20478BATBF/VY+T integrates a windowed watchdog that requires the WDI signal to toggle within a defined upper and lower time boundary. This prevents false resets from stuck signals and detects both firmware hang and clock failure. The watchdog can be permanently disabled using the WDDIS pin, which is useful during debug or safe-mode operation of the MAX20478BATBF/VY+T.
What package type and dimensions does MAX20478BATBF/VY+T use?
MAX20478BATBF/VY+T uses a 10-pin side-wettable TDFN package measuring 3mm × 3mm with an exposed thermal pad. This package supports automated optical inspection of solder joints-a critical requirement for zero-defect automotive manufacturing-and provides thermal performance suitable for under-hood ambient temperatures up to +125°C.
Is MAX20478BATBF/VY+T AEC-Q100 qualified, and at which grade?
Yes, MAX20478BATBF/VY+T is AEC-Q100 qualified at Grade 0, covering the full automotive temperature range of –40°C to +125°C. It undergoes stress testing including HTOL, TC, UHAST, and ESD per AEC-Q100 Rev H, and its qualification report is available under NDA from Analog Devices. This Grade 0 rating confirms suitability for engine compartment and ADAS ECU deployments.
MAX20478BATBF/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478BATBF/VY+T FAQ
1.How can I place an order for MAX20478BATBF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBF/VY+T 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 MAX20478BATBF/VY+T reliable?
The price and inventory of MAX20478BATBF/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478BATBF/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478BATBF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBF/VY+T?
MAX20478BATBF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBF/VY+T 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 MAX20478BATBF/VY+T?
For technical support, including MAX20478BATBF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBF/VY+T requirements.
6.How does Aetrix verify that MAX20478BATBF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBF/VY+T 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 MAX20478BATBF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478BATBF/VY+T?
All MAX20478BATBF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBF/VY+T, 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 MAX20478BATBF/VY+T part is unused and in its original packaging.
Return procedure for MAX20478BATBF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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