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Analog Devices Inc./Maxim Integrated MAX20478BATBA/VY+
- Part No.:
- MAX20478BATBA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBA/VY+.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:1,207
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Product details
Overview
MAX20478BATBA/VY+ 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)-for power system supervision in ADAS ECUs.
For engineers reviewing the MAX20478BATBA/VY+ datasheet, MAX20478BATBA/VY+ pinout, MAX20478BATBA/VY+ application, or MAX20478BATBA/VY+ equivalent, key selection factors include ASIL D compliance, OTP-configurable reset timing, side-wettable 10-pin TDFN package, and support for dual independent RESET outputs in safety-critical vehicle subsystems.
Technical Context
The MAX20478BATBA/VY+ implements a fully integrated monitoring SoC architecture with three independent analog input channels, each with digitally programmable overvoltage (102.5%–110%) and undervoltage (90%–97.5%) thresholds. Its windowed watchdog accepts WDI pulses and asserts WDDIS on timeout or invalid edge timing.
Configuration is stored in on-chip OTP memory with ECC protection, eliminating external configuration components. The device uses an internal reference and precision comparators to achieve ±0.8% threshold accuracy across temperature, supporting AEC-Q100 Grade 0 qualification for under-hood applications.
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 of critical MCU/SOC supply rails without calibration |
| Supply Voltage Range | 2.35V to 5.50V - supports direct connection to 3.3V or 5V automotive domains |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and ADAS sensor module placement |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems |
| Watchdog Type | Windowed - requires valid pulse timing within upper/lower bounds to prevent false resets |
| Package | 10-pin side-wettable TDFN (3mm × 3mm) - supports automated optical solder inspection (AOI) |
Pinout & Package
MAX20478BATBA/VY+ is housed in a 10-pin side-wettable TDFN package (3mm × 3mm) with exposed thermal pad. Pin numbering follows standard TDFN convention (pin 1 marked by dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers internal regulators and comparators |
| GND | Ground reference | Primary return path for analog and digital circuitry; connects to exposed pad |
| 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 configurable delay and polarity; drive external MCUs or SoCs |
| WDI | Watchdog input | Accepts windowed pulse train; failure to meet timing window triggers watchdog reset |
| WDDIS | Watchdog disable output | Open-drain signal indicating watchdog timeout or fault condition |
| REF | Internal reference output | Provides 1.25V reference for external circuitry; buffered and stable |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Validated per ISO 26262 for use in safety goals up to ASIL D, including diagnostic coverage and fault injection test reports |
| OTP with ECC | One-time-programmable configuration memory with error-correcting code ensures reliable startup behavior after power cycling |
| Dual independent RESET outputs | RESET1 and RESET2 can be individually configured for different delay times and assertion conditions, enabling staged system recovery |
| Side-wettable TDFN | 10-pin 3mm × 3mm package with gull-wing side terminals enables automated optical inspection of solder joints |
| No external components required | Integrated reference, comparators, and logic eliminate need for external resistors, capacitors, or supervisory ICs |
Applications
| ADAS ECU Power Supervision | Autonomous Driving SoC Monitoring |
|---|---|
Use Scenario: Continuous monitoring of 1.8V, 3.3V, and 5V rails powering radar preprocessing units and camera ISPs in Level 2+ ADAS ECUs. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor ensuring safe power sequencing and fault-triggered reset before SoC lockup. Use Value: Prevents silent data corruption by detecting brownout on vision processor supplies and asserting RESET1 within 10ms. | Use Scenario: Supervising multiple voltage domains (core, I/O, memory) of an autonomous driving SoC during boot and runtime in centralized domain controllers. IC Role / Device Role / Timing Role: Three-input rail monitor with windowed watchdog acting as primary safety supervisor for functional safety manager (FSM) firmware. Use Value: Enables ASIL D decomposition by providing independent hardware-based reset signaling for critical SoC domains without software dependency. |
| Remote Sensor Node Supervision | Vehicle Gateway Power Integrity |
Use Scenario: Compact voltage supervision in IP67-rated ultrasonic parking sensors located near wheel wells, exposed to wide thermal swings. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete supervisors and RC timers, operating reliably at –40°C to +125°C. Use Value: Reduces BOM count by 4 components and PCB area by 35% while maintaining AEC-Q100 Grade 0 compliance. | Use Scenario: Monitoring 3.3V CAN FD transceiver supply, 5V LIN interface rail, and 12V-to-5V DC-DC output in vehicle gateway modules. IC Role / Device Role / Timing Role: Multi-rail supervisor with programmable UV/OV thresholds per input and independent RESET2 for gateway microcontroller recovery. Use Value: Eliminates need for three separate voltage monitors, simplifying layout and improving fault isolation between communication interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477BATBA/VY+ | Two-input variant (IN1/IN2 only); no IN3 support; identical watchdog, RESET, and OTP features | Suitable for dual-rail systems only; cannot monitor high-voltage auxiliary rails like 5V or 12V-derived supplies | Select MAX20477BATBA/VY+ when only two monitored rails are required and board space allows same footprint |
| TLV809EADBZR | Single-channel 3.3V supervisor with fixed 2.93V reset threshold; no watchdog, no programmability, no AEC-Q100 Grade 0 rating | Limited to basic reset generation in non-safety-critical modules; lacks multi-rail coordination or diagnostics | Use TLV809EADBZR only for cost-sensitive, non-ASIL applications where single-rail monitoring suffices |
Compared with MAX20477BATBA/VY+, the MAX20478BATBA/VY+ adds third-input capability for auxiliary rail supervision; compared with TLV809EADBZR, it delivers ASIL D compliance, programmable thresholds, and integrated watchdog-enabling consolidated safety monitoring in modern E/E architectures.
Availability
MAX20478BATBA/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 across automotive production lifecycles.
Supply support for MAX20478BATBA/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20478 belongs to Analog Devices' automotive safety power monitoring product line, designed specifically to replace discrete supervisory circuits in ASIL B–D systems while reducing design complexity and validation effort.
FAQ
What is the function of the WDDIS pin on the MAX20478BATBA/VY+?
The WDDIS (Watchdog Disable) pin on the MAX20478BATBA/VY+ is an open-drain output that asserts low when the windowed watchdog detects a timeout or invalid pulse timing on the WDI input. It provides a dedicated fault indicator separate from the RESET outputs, allowing system-level diagnostics to distinguish between power-related and timing-related failures. This signal is actively used in the MAX20478BATBA/VY+ safety architecture to feed fault status into host microcontrollers or safety managers.
Does the MAX20478BATBA/VY+ support AEC-Q100 qualification?
Yes, the MAX20478BATBA/VY+ is AEC-Q100 qualified for Grade 0 (–40°C to +125°C ambient), with full test reports covering HTOL, TC, UHAST, and ESD. This qualification is integral to its ASIL D compliance and confirms suitability for under-hood and ADAS ECU applications. The MAX20478BATBA/VY+ datasheet explicitly lists AEC-Q100 qualification as a core specification, not a derivative claim.
How many voltage inputs does the MAX20478BATBA/VY+ monitor, and what are their ranges?
The MAX20478BATBA/VY+ monitors three independent voltage inputs: IN1 and IN2 support 0.5V to 3.6875V in 12.5mV steps, while IN3 supports 0.5V to 5.6V in 20mV steps. These ranges are factory-programmable via OTP and verified across temperature. The MAX20478BATBA/VY+ datasheet specifies these exact limits and step sizes in the Electrical Characteristics table, confirming triple-input capability distinct from the two-input MAX20477 variant.
Can the RESET1 and RESET2 outputs of the MAX20478BATBA/VY+ be configured independently?
Yes, the MAX20478BATBA/VY+ allows independent configuration of RESET1 and RESET2 through OTP programming, including separate delay times, OV/UV trigger conditions, and assertion polarity. This enables staged reset sequencing-for example, asserting RESET1 to reboot a peripheral ASIC while holding RESET2 active longer to fully reinitialize the main SoC. Configuration is persistent and verified in the MAX20478BATBA/VY+ functional safety documentation.
Is the MAX20478BATBA/VY+ pin-compatible with other devices in the MAX2047x family?
No, the MAX20478BATBA/VY+ is not pin-compatible with MAX20477BATBA/VY+ or MAX20479 variants due to differing pin assignments for IN3, REF, and WDDIS functions. While all share the same 10-pin side-wettable TDFN package outline, the MAX20478BATBA/VY+ allocates unique pins for its third input and watchdog disable output. Board-level reuse requires schematic and layout revision-not just footprint compatibility.
MAX20478BATBA/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)
MAX20478BATBA/VY+ FAQ
1.How can I place an order for MAX20478BATBA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBA/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 MAX20478BATBA/VY+ reliable?
The price and inventory of MAX20478BATBA/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20478BATBA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBA/VY+?
MAX20478BATBA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBA/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 MAX20478BATBA/VY+?
For technical support, including MAX20478BATBA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBA/VY+ requirements.
6.How does Aetrix verify that MAX20478BATBA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBA/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 MAX20478BATBA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20478BATBA/VY+?
All MAX20478BATBA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBA/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 MAX20478BATBA/VY+ part is unused and in its original packaging.
Return procedure for MAX20478BATBA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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