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Analog Devices Inc./Maxim Integrated MAX20478AATBC/VY+
- Part No.:
- MAX20478AATBC/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478AATBC/VY+.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:2,747
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Product details
Overview
MAX20478AATBC/VY+ from Analog Devices is an ASIL D-compliant automotive voltage monitor SoC with two configurable voltage inputs (0.5V–3.6875V, 12.5mV steps), ±0.8% threshold accuracy, programmable windowed watchdog, and operation from -40°C to +125°C. It serves as a system-level power supervisor in ADAS domain controllers.
For engineers reviewing the MAX20478AATBC/VY+ datasheet, MAX20478AATBC/VY+ pinout, MAX20478AATBC/VY+ application, or MAX20478AATBC/VY+ equivalent, key selection considerations include ASIL D compliance, dual-input voltage monitoring resolution, watchdog windowing capability, and AEC-Q100 qualification for safety-critical automotive power supervision.
Technical Context
The MAX20478AATBC/VY+ implements a fully integrated analog monitoring architecture with OTP-based configuration and error-correcting code. Its two voltage monitor inputs support independent OV/UV thresholds (90–102.5%, ±0.8% accuracy) and share a common 2.35V–5.50V supply range.
It includes a windowed watchdog with WDI input and WDDIS control, RESET1/RESET2 outputs with programmable assertion timing, and internal reference generation. All functions operate across the full -40°C to +125°C ambient temperature range without external calibration components.
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 LDO |
| Input Voltage Monitoring Range (IN1/IN2) | 0.5V to 3.6875V in 12.5mV steps - enables precise monitoring of core logic, I/O, or sensor supply rails |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection under temperature and aging stress in ASIL D systems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and ECU module deployment |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems |
| Watchdog Type | Programmable windowed watchdog - prevents false resets during transient voltage excursions while detecting lockup |
Pinout & Package
10-pin side-wettable TDFN (3mm × 3mm) with exposed thermal pad - enables automated optical inspection (AOI) and improves 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 monitoring circuitry |
| GND | Ground reference | Common return path for all analog and digital blocks; connects to exposed pad |
| IN1, IN2 | Monitor input channels | High-impedance inputs for sensing 0.5V–3.6875V rails with 12.5mV programmable thresholds |
| RESET1, RESET2 | Open-drain reset outputs | Programmable active-low reset signals with independent OV/UV response assignment |
| WDI | Watchdog input | Edge-triggered input for windowed watchdog; requires periodic toggling to prevent timeout |
| WDDIS | Watchdog disable control | Active-high signal to temporarily suspend watchdog function during safe firmware updates |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance per ISO 26262 | Validated fault coverage and diagnostic coverage for use in safety goals up to ASIL D |
| OTP configuration with ECC | One-time-programmable memory with error-correcting code ensures robust configuration retention over lifetime |
| Side-wettable TDFN package | Enables automated X-ray and AOI inspection for zero-defect automotive manufacturing |
| Only one external component required | Eliminates need for external RC timing networks or reference dividers - reduces BOM count and layout area |
| AEC-Q100 Grade 0 qualification | Qualified for operation at +150°C junction temperature - exceeds standard Grade 1 requirements |
Applications
| ADAS Domain Controller Supervision | Autonomous Driving SoC Power Monitoring |
|---|---|
Use Scenario: Real-time monitoring of multiple voltage rails (e.g., 1.8V core, 3.3V I/O) in NVIDIA Orin or TI Jacinto ADAS domain controllers. IC Role / Device Role / Timing Role: System-level power supervisor providing ASIL D-compliant OV/UV detection and synchronized reset signaling. Use Value: Enables deterministic fail-safe behavior during rail collapse, meeting ISO 26262 FMEDA requirements for ASIL D decomposition. | Use Scenario: Continuous supervision of processor core, memory, and interface supplies in autonomous driving compute modules. IC Role / Device Role / Timing Role: Dual-input voltage monitor with windowed watchdog ensuring both power integrity and software liveliness. Use Value: Reduces need for redundant discrete supervisors while maintaining single-point-of-failure mitigation per safety plan. |
| Remote Sensor Node Power Management | Automotive Microcontroller Reset Coordination |
Use Scenario: Compact voltage supervision in battery-powered radar or camera sensor nodes with strict size and power constraints. IC Role / Device Role / Timing Role: Low-quiescent-current (125µA) supervisor enabling always-on monitoring without compromising battery life. Use Value: Eliminates external voltage dividers and LDOs - shrinks PCB footprint by >40% vs. discrete solutions. | Use Scenario: Coordinating reset sequencing between main MCU and companion safety MCU in dual-lockstep architectures. IC Role / Device Role / Timing Role: Programmable RESET1/RESET2 outputs with independent OV/UV assignment per input channel. Use Value: Supports staggered reset assertion to meet boot-order dependencies in ISO 26262-compliant MCUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBVR | Single-channel 3.3V fixed-threshold supervisor; no watchdog; ±2% accuracy; no ASIL rating | Limited to basic reset generation in non-safety-critical modules (e.g., infotainment) | Use only where ASIL compliance and multi-rail monitoring are not required |
| MAX22026ATP+ | Dual-channel isolated voltage monitor with 1.5kVRMS isolation; no built-in watchdog; ±0.5% accuracy; operates up to +105°C | Suitable for high-side sensing in isolated power domains but lacks ASIL D validation and extended temperature support | Select when galvanic isolation is mandatory and safety certification is handled externally |
Compared with TLV809E33DBVR and MAX22026ATP+, the MAX20478AATBC/VY+ uniquely delivers ASIL D compliance, dual programmable voltage inputs with ±0.8% accuracy, and integrated windowed watchdog in a single AEC-Q100 Grade 0 package - making it the only option for consolidated safety-critical power supervision in ADAS ECUs.
Availability
MAX20478AATBC/VY+ is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving processing units, and automotive microcontroller unit monitoring requiring stable component supply and long-term automotive lifecycle support.
Supply support for MAX20478AATBC/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, serving automotive, industrial, communications, and healthcare markets.
The MAX20478 product line delivers ASIL D-compliant, highly integrated power supervision ICs designed specifically for safety-critical automotive ECUs including ADAS domain controllers and autonomous driving compute platforms.
FAQ
What is the maximum number of voltage inputs supported by the MAX20478AATBC/VY+?
The MAX20478AATBC/VY+ supports exactly two voltage monitor inputs (IN1 and IN2), as indicated by its 'A' suffix in the part number. The MAX20478B variant supports three inputs. Both variants share identical watchdog, reset, and configuration features, but the MAX20478AATBC/VY+ is specifically configured for dual-input operation per factory OTP programming.
Does the MAX20478AATBC/VY+ require external passive components for basic operation?
No - the MAX20478AATBC/VY+ requires only one external component (a bypass capacitor on VDD) for stable operation. Its internal reference, threshold generation, and watchdog timing are all implemented on-die with no external RC networks or dividers needed, reducing design complexity and board space versus discrete solutions.
Is the MAX20478AATBC/VY+ qualified for under-hood automotive environments?
Yes - the MAX20478AATBC/VY+ is AEC-Q100 Grade 0 qualified and specified for operation from -40°C to +125°C ambient temperature. Its design meets the thermal, vibration, and reliability requirements for placement in engine compartment ECUs and other harsh automotive locations.
How is ASIL D compliance achieved in the MAX20478AATBC/VY+?
The MAX20478AATBC/VY+ achieves ASIL D compliance through integrated diagnostics (including OTP ECC, internal reference monitoring, and watchdog self-test), fault-tolerant architecture, and full ISO 26262-5/6 documentation including FMEDA, safety manual, and hardware safety assessment report - all validated by third-party certification bodies.
Can the watchdog window timing be adjusted on the MAX20478AATBC/VY+?
Yes - the windowed watchdog timeout and window width on the MAX20478AATBC/VY+ are programmable via OTP configuration. The watchdog requires periodic edge transitions on WDI within a defined window; deviation outside that window triggers RESET assertion. Configuration is performed once during manufacturing and retained with ECC protection.
MAX20478AATBC/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tray
- 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)
MAX20478AATBC/VY+ FAQ
1.How can I place an order for MAX20478AATBC/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478AATBC/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 MAX20478AATBC/VY+ reliable?
The price and inventory of MAX20478AATBC/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478AATBC/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20478AATBC/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478AATBC/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478AATBC/VY+?
MAX20478AATBC/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478AATBC/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 MAX20478AATBC/VY+?
For technical support, including MAX20478AATBC/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478AATBC/VY+ requirements.
6.How does Aetrix verify that MAX20478AATBC/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20478AATBC/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 MAX20478AATBC/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20478AATBC/VY+?
All MAX20478AATBC/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478AATBC/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 MAX20478AATBC/VY+ part is unused and in its original packaging.
Return procedure for MAX20478AATBC/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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