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Analog Devices Inc./Maxim Integrated MAX20478BATBA/VY+T
- Part No.:
- MAX20478BATBA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBA/VY+T.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
MAX20478BATBA/VY+T from Analog Devices is a three-input ASIL D-compliant automotive voltage monitor IC with integrated windowed watchdog, 2.35V–5.50V supply range, ±0.8% threshold accuracy, 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) for OV/UV faults in ADAS domain controllers.
For engineers reviewing the MAX20478BATBA/VY+T datasheet, MAX20478BATBA/VY+T pinout, MAX20478BATBA/VY+T application, or MAX20478BATBA/VY+T equivalent, key selection criteria include ASIL D compliance, programmable OV/UV thresholds (90–110%), 125µA quiescent current, side-wettable 10-pin TDFN package, and OTP-configurable watchdog behavior.
Technical Context
The MAX20478BATBA/VY+T implements a fully integrated, OTP-programmed monitoring SoC with independent OV/UV comparators per input, each supporting 2.5–10% hysteresis and ±0.8% absolute threshold accuracy. Its windowed watchdog accepts WDI pulses and asserts WDDIS on timeout or out-of-window event.
It features dual programmable reset outputs (RESET1/RESET2), internal reference (VREF), UVLO protection, and operates from a single 2.35V–5.50V supply. The device uses a dedicated oscillator for watchdog timing and supports AEC-Q100 Grade 0 qualification for under-hood automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.35V to 5.50V - supports direct connection to 3.3V or 5V automotive rails without external regulators. |
| Input Voltage Monitoring Range | Inputs 1–2: 0.5V–3.6875V (12.5mV step); Input 3: 0.5V–5.6V (20mV step) - enables precise monitoring of core, I/O, and analog supply domains. |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection across temperature and lifetime without calibration. |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and ADAS ECU placement per AEC-Q100 Grade 0. |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems. |
| Watchdog Type | Programmable windowed watchdog - detects both stuck-high and stuck-low WDI signals, critical for safety-critical microcontroller supervision. |
Pinout & Package
Package: 10-pin side-wettable TDFN (3mm × 3mm) with exposed pad - enables automated optical inspection (AOI) and improves thermal performance in high-reliability automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V main supply; powers all internal blocks including comparators and watchdog logic. |
| GND | Ground reference | Primary return path for analog and digital circuits; connects to exposed pad for thermal and noise integrity. |
| IN1, IN2, IN3 | Monitor input terminals | High-impedance inputs for sensing system rails; IN1/IN2 support 0.5V–3.6875V, IN3 supports 0.5V–5.6V ranges. |
| RESET1, RESET2 | Open-drain reset outputs | Configurable as active-low reset signals for MCU or SoC; driven low on OV/UV fault or watchdog timeout. |
| WDI | Watchdog input | Accepts periodic pulses from host processor; missing or out-of-window edges trigger watchdog fault. |
| WDDIS | Watchdog disable output | Open-drain signal asserted low during watchdog fault to inform system-level fault handler. |
| VREF | Internal reference output | Provides stable 1.25V reference for external circuitry or calibration; buffered and temperature-compensated. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated per ISO 26262 for use in safety-critical automotive functions such as ADAS sensor fusion and autonomous driving control paths. |
| OTP configuration with ECC | Enables one-time programming of thresholds, watchdog window, and reset behavior with error correction-eliminates external configuration EEPROM and reduces BOM count. |
| Side-wettable TDFN package | Facilitates automated solder-joint inspection (AOI) and improves process yield in high-volume automotive manufacturing. |
| Single external component requirement | Only needs VDD bypass capacitor-reduces layout complexity and eliminates discrete resistor dividers or external references. |
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, 5V camera interface) in centralized ADAS ECUs. IC Role / Device Role / Timing Role: System-level voltage supervisor ensuring safe shutdown or fault reporting before MCU corruption occurs. Use Value: Prevents silent data corruption by detecting undervoltage on SoC core supplies with ±0.8% accuracy across –40°C to +125°C. | Use Scenario: Continuous supervision of heterogeneous power domains in L2+/L3 autonomous driving compute platforms. IC Role / Device Role / Timing Role: Three-input monitor with windowed watchdog acting as hardware-enforced safety layer for AI accelerator and vision processor subsystems. Use Value: Enables ISO 26262 ASIL D decomposition by providing independent, fail-safe voltage and watchdog monitoring not reliant on software. |
| Remote Radar Sensor Module | Automotive Gateway Microcontroller Supervision |
Use Scenario: Compact, thermally constrained 77GHz radar front-end modules requiring ultra-low-power supervision. IC Role / Device Role / Timing Role: Low-quiescent-current (125µA) voltage monitor managing rail integrity and watchdog handshaking over CAN/FlexRay links. Use Value: Maintains functional safety compliance while consuming <150µA total - critical for battery-backed or energy-harvested remote sensors. | Use Scenario: Supervising boot sequence and runtime stability of gateway MCUs handling vehicle network bridging (CAN, LIN, Ethernet). IC Role / Device Role / Timing Role: Dual-reset generator with configurable delay and OV/UV response, interfacing directly with MCU reset inputs and watchdog peripherals. Use Value: Eliminates need for discrete reset ICs and external watchdog timers, reducing footprint and failure modes in multi-protocol gateways. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809EADBZR | Single-input, fixed-threshold (3.08V) supervisor; no watchdog; ±2% accuracy; SOT-23-3 package. | Limited to basic reset generation for non-safety-critical modules; lacks ASIL D validation and multi-rail capability. | Use only for cost-sensitive, non-ASIL applications where single-rail monitoring suffices. |
| NCP302LSN33T1G | Single-input, adjustable-threshold (0.9V–6.0V) supervisor; no watchdog; ±1.5% accuracy; SOT-23-5 package. | Supports wider input range but lacks OTP configuration, windowed watchdog, and ASIL D certification. | Consider for legacy designs needing field-adjustable thresholds without safety certification. |
Compared with TLV809EADBZR and NCP302LSN33T1G, the MAX20478BATBA/VY+T delivers triple-input monitoring, ASIL D compliance, windowed watchdog, and ±0.8% accuracy in a side-wettable package-making it uniquely suited for next-generation automotive safety systems where integration, precision, and functional safety are mandatory.
Availability
MAX20478BATBA/VY+T is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving processing units, and automotive power system supervision requiring stable component supply and long-term lifecycle support.
Supply support for MAX20478BATBA/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 product line delivers ASIL D-compliant, highly integrated voltage supervisors for automotive safety-critical ECUs-designed specifically to replace discrete monitoring solutions in ADAS and autonomous driving architectures.
FAQ
What is the function of the WDDIS pin on the MAX20478BATBA/VY+T?
The WDDIS (Watchdog Disable) pin on the MAX20478BATBA/VY+T is an open-drain output that goes low when the windowed watchdog detects a fault-such as missing, early, or late WDI pulses. This signal informs the host system of a watchdog timeout condition independently of the RESET outputs, enabling layered fault response in ASIL D architectures. The MAX20478BATBA/VY+T uses WDDIS to decouple watchdog status from reset assertion timing.
Does the MAX20478BATBA/VY+T support configuration after soldering?
No, the MAX20478BATBA/VY+T uses one-time programmable (OTP) memory with error-correcting code for configuration-including voltage thresholds, watchdog window, and reset behavior-programmed at wafer test. Configuration cannot be modified post-soldering. This ensures deterministic, tamper-resistant behavior required for ASIL D compliance. The MAX20478BATBA/VY+T does not support I²C, SPI, or other runtime reconfiguration interfaces.
What is the difference between MAX20478A and MAX20478B variants?
The MAX20478A variant provides two voltage monitor inputs (IN1, IN2), while the MAX20478B-of which MAX20478BATBA/VY+T is a member-provides three inputs (IN1, IN2, IN3). Both share identical watchdog, reset, and OTP architecture, but only MAX20478B supports monitoring of a third rail (e.g., 5V camera or radar supply). The MAX20478BATBA/VY+T is the MAX20478B version in 10-pin side-wettable TDFN.
Is the MAX20478BATBA/VY+T pin-compatible with earlier MAX2047x devices?
No, the MAX20478BATBA/VY+T is not pin-compatible with prior MAX2047x series devices. It uses a unique 10-pin side-wettable TDFN layout optimized for automotive AOI and thermal performance. Pin assignments-including VREF, WDDIS, and dual RESET outputs-differ from legacy packages. Migration requires PCB redesign. The MAX20478BATBA/VY+T introduces new functionality not present in earlier generations.
What does "ASIL D-compliant" mean for the MAX20478BATBA/VY+T?
ASIL D-compliance for the MAX20478BATBA/VY+T means it meets the highest Automotive Safety Integrity Level defined in ISO 26262, covering requirements for fault detection coverage, diagnostic coverage, systematic capability, and hardware metrics (SPFM, LFM, PMHF). This includes built-in self-test structures, ECC-protected OTP, redundant internal paths, and full documentation for safety case integration. The MAX20478BATBA/VY+T is certified for use in safety goals requiring ≤10⁻⁸ failures per hour.
MAX20478BATBA/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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478BATBA/VY+T FAQ
1.How can I place an order for MAX20478BATBA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBA/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 MAX20478BATBA/VY+T reliable?
The price and inventory of MAX20478BATBA/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 MAX20478BATBA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478BATBA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBA/VY+T?
MAX20478BATBA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBA/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 MAX20478BATBA/VY+T?
For technical support, including MAX20478BATBA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBA/VY+T requirements.
6.How does Aetrix verify that MAX20478BATBA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBA/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 MAX20478BATBA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478BATBA/VY+T?
All MAX20478BATBA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBA/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 MAX20478BATBA/VY+T part is unused and in its original packaging.
Return procedure for MAX20478BATBA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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