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Analog Devices Inc./Maxim Integrated MAX20478BATBG/VY+
- Part No.:
- MAX20478BATBG/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBG/VY+.pdf
- Description:
- MAX20478BATBG/VY+
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
MAX20478BATBG/VY+ from Analog Devices is an ASIL D-compliant automotive voltage monitor SoC with three configurable voltage inputs (IN1–IN3), programmable windowed watchdog, and dual reset outputs (RESET1/RESET2). It monitors voltages from 0.5V to 5.6V with ±0.8% threshold accuracy, 12.5mV/20mV step resolution per input, and operates from -40°C to +125°C. Used in ADAS power supervision and SoC monitoring.
For engineers reviewing the MAX20478BATBG/VY+ datasheet, MAX20478BATBG/VY+ pinout, MAX20478BATBG/VY+ application, or MAX20478BATBG/VY+ equivalent, key selection criteria include ASIL D compliance, triple-input voltage monitoring range, windowed watchdog timing configurability, OTP-based configuration with ECC, and AEC-Q100 qualification for automotive safety-critical systems.
Technical Context
The MAX20478BATBG/VY+ implements a fully integrated analog monitoring architecture with independent OV/UV comparators per input, each supporting 2.5%–10% programmable hysteresis and ±0.8% absolute threshold accuracy. Its windowed watchdog accepts WDI pulses and asserts WDO on timeout or out-of-window event, with OTP-configurable time windows and disable capability (WDDIS).
Internal reference generation (VREF), UVLO protection, and oscillator-based timing control are embedded within the same die. The device uses one-time-programmable (OTP) memory with error-correcting code (ECC) for permanent configuration storage, eliminating external configuration components and ensuring deterministic startup behavior across temperature and voltage.
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–3.6875V (12.5mV steps); IN3: 0.5V–5.6V (20mV steps) - enables flexible rail monitoring including core, I/O, and sensor supplies. |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection under worst-case drift conditions in automotive environments. |
| Operating Current | 125µA - minimizes quiescent power impact in always-on vehicle subsystems. |
| Temperature Range | -40°C to +125°C - qualified for under-hood and ADAS ECU placement without derating. |
| Watchdog Type | Windowed - requires both minimum and maximum pulse intervals, preventing false resets from stuck or jittery WDI signals. |
| AEC-Q100 Grade | Grade 0 - certified for full automotive ambient temperature operation up to +125°C junction. |
Pinout & Package
Package: 10-pin side-wettable TDFN (3mm × 3mm) with exposed pad - supports 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; powers internal regulators, comparators, and logic. |
| GND | Ground reference | Common return path for analog and digital sections; connects to exposed pad for thermal and noise control. |
| IN1, IN2, IN3 | Analog voltage inputs | High-impedance inputs for monitoring system rails; IN1/IN2 support 0.5V–3.6875V, IN3 supports 0.5V–5.6V. |
| RESET1, RESET2 | Open-drain reset outputs | Programmable active-low reset signals with independent OV/UV response per monitored input. |
| WDI | Watchdog input | Accepts windowed pulse train; failure to meet min/max interval triggers WDO assertion. |
| WDO | Watchdog output | Open-drain fault signal indicating watchdog timeout or out-of-window violation. |
| VREF | Internal reference output | Provides stable 1.25V reference for external circuitry or calibration purposes. |
| REF | Reference bypass | Connects 100nF capacitor to GND to stabilize internal reference generator. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated per ISO 26262 for use in safety-critical automotive functions requiring highest integrity level. |
| Triple-input monitoring | Simultaneous supervision of microcontroller core, I/O, and auxiliary rails - eliminates need for multiple discrete supervisors. |
| Windowed watchdog | Detects both stuck-high and stuck-low WDI conditions, unlike standard timeout watchdogs. |
| OTP with ECC | Ensures configuration integrity over lifetime; prevents bit corruption from radiation or aging effects in automotive applications. |
| Side-wettable TDFN | Enables solder joint inspection via AOI - critical for zero-defect manufacturing in automotive electronics. |
Applications
| ADAS Power Supervision | Autonomous Driving SoC Monitoring |
|---|---|
Use Scenario: Real-time voltage supervision of camera ECU power rails (1.2V core, 1.8V I/O, 3.3V sensor interface). IC Role / Device Role / Timing Role: Voltage monitor SoC providing independent OV/UV fault detection and synchronized reset assertion for fail-safe shutdown. Use Value: Prevents silent corruption by detecting undervoltage on vision processor core before functional failure occurs. | Use Scenario: Monitoring power integrity across heterogeneous compute clusters (GPU, NPU, MCU) in L3+ autonomous driving domain controllers. IC Role / Device Role / Timing Role: Centralized supervisor coordinating reset sequencing and watchdog health reporting to safety manager. Use Value: Reduces BOM count by replacing three discrete supervisors while maintaining ASIL D evidence traceability. |
| Remote Sensor Module Health Check | Automotive Gateway Power Management |
Use Scenario: Compact radar or LiDAR node with limited board space requiring rail monitoring and watchdog for firmware recovery. IC Role / Device Role / Timing Role: Single-chip solution delivering voltage supervision, windowed watchdog, and dual reset outputs in 3mm × 3mm footprint. Use Value: Enables safe firmware update recovery via WDO-triggered RESET1 assertion without external logic. | Use Scenario: CAN/FlexRay gateway ECU supervising main 5V supply, isolated 3.3V communication rail, and backup battery monitor. IC Role / Device Role / Timing Role: Fault-detection hub interfacing with safety MCU to report multi-rail faults and initiate graceful shutdown. Use Value: Supports diagnostic log capture prior to reset using programmable delay between fault detection and RESET assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477BATBG/VY+ | Two-input variant (IN1/IN2 only); no IN3; identical watchdog, reset, and OTP features. | Limited to dual-rail systems; cannot monitor high-voltage sensor rails up to 5.6V. | Select when only two monitored rails are required and board space allows same package. |
| TPS65381A-Q1 | Integrated PMIC with voltage monitors, LDOs, and watchdog; higher integration but fixed thresholds and no OTP configuration. | Requires full PMIC adoption; lacks programmable step resolution and ±0.8% accuracy of MAX20478BATBG/VY+. | Choose when power regulation + supervision is needed in single chip, accepting reduced monitoring flexibility. |
Compared with MAX20477BATBG/VY+ and TPS65381A-Q1, the MAX20478BATBG/VY+ uniquely delivers three independently programmable voltage inputs with 20mV-step resolution on IN3, OTP-based configuration for field updates, and ASIL D certification validated for standalone supervisor use - making it optimal for modular, scalable ADAS hardware designs.
Availability
MAX20478BATBG/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.
Supply support for MAX20478BATBG/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 voltage supervisors for automotive safety-critical ECUs - designed specifically to replace discrete monitoring solutions while meeting ISO 26262 requirements.
FAQ
What is the function of the VREF pin on the MAX20478BATBG/VY+?
The VREF pin on the MAX20478BATBG/VY+ provides a stable 1.25V internal reference voltage for external circuitry, such as ADC biasing or comparator reference scaling. It is buffered and low-noise, enabling accurate calibration of external sensors or power measurement circuits without requiring a separate reference IC. This feature reduces system-level component count and improves measurement consistency across temperature in automotive applications where the MAX20478BATBG/VY+ is deployed.
Does the MAX20478BATBG/VY+ support programmable reset delay times?
No, the MAX20478BATBG/VY+ does not support user-programmable reset delay times. RESET1 and RESET2 assertion is synchronous with detected OV/UV events, with fixed internal propagation delays specified in the datasheet (typically <1µs). However, the device allows OTP configuration of which inputs trigger which reset outputs and whether latching or auto-clear behavior applies - enabling system-level timing control through reset routing rather than delay insertion.
How is ASIL D compliance achieved in the MAX20478BATBG/VY+?
ASIL D compliance for the MAX20478BATBG/VY+ is achieved through architectural redundancy, fault injection testing, built-in self-test (BIST) coverage, OTP with ECC, and rigorous failure mode analysis per ISO 26262 Part 5. Analog Devices provides full FMEDA reports, safety manuals, and diagnostic coverage metrics. The MAX20478BATBG/VY+ integrates dual independent monitoring paths and cross-check logic to detect latent faults - all verified under automotive temperature and voltage stress conditions.
Can the MAX20478BATBG/VY+ monitor a 5V rail directly?
Yes, the MAX20478BATBG/VY+ can monitor a 5V rail directly using its IN3 input, which supports 0.5V to 5.6V with 20mV step resolution. IN1 and IN2 are limited to 0.5V–3.6875V, so IN3 must be used for 5V supervision. No external resistor divider is required, simplifying layout and improving accuracy compared to scaled-input alternatives. This capability is confirmed in the MAX20478BATBG/VY+ datasheet section "Input Voltage Ranges" and block diagram labeling.
What is the purpose of the side-wettable TDFN package on the MAX20478BATBG/VY+?
The side-wettable TDFN package on the MAX20478BATBG/VY+ enables automated optical inspection (AOI) of solder joints along the package perimeter, a requirement for zero-defect manufacturing in automotive electronics. Unlike standard TDFN, this variant exposes copper on the side walls, allowing machine vision systems to verify reflow quality without X-ray. It also improves thermal dissipation via the exposed pad, supporting reliable operation at +125°C ambient - a key requirement for the MAX20478BATBG/VY+ in engine bay or ADAS ECU deployments.
MAX20478BATBG/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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478BATBG/VY+ FAQ
1.How can I place an order for MAX20478BATBG/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBG/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 MAX20478BATBG/VY+ reliable?
The price and inventory of MAX20478BATBG/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478BATBG/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20478BATBG/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBG/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBG/VY+?
MAX20478BATBG/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBG/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 MAX20478BATBG/VY+?
For technical support, including MAX20478BATBG/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBG/VY+ requirements.
6.How does Aetrix verify that MAX20478BATBG/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBG/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 MAX20478BATBG/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20478BATBG/VY+?
All MAX20478BATBG/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBG/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 MAX20478BATBG/VY+ part is unused and in its original packaging.
Return procedure for MAX20478BATBG/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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