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Analog Devices Inc./Maxim Integrated MAX20478BATBG/VY+T
- Part No.:
- MAX20478BATBG/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBG/VY+T.pdf
- Description:
- MAX20478BATBG/VY+T
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
MAX20478BATBG/VY+T from Analog Devices is a three-input ASIL D-compliant automotive voltage monitor IC with windowed watchdog, operating from 2.35V to 5.50V supply, featuring ±0.8% threshold accuracy, 0.5% step size, and -40°C to +125°C operation for power supervision in ADAS ECUs.
For engineers reviewing the MAX20478BATBG/VY+T datasheet, MAX20478BATBG/VY+T pinout, MAX20478BATBG/VY+T application, or MAX20478BATBG/VY+T equivalent, key selection criteria include triple-voltage monitoring range (0.5V–5.6V), programmable OV/UV thresholds (90–110%), OTP configuration with ECC, AEC-Q100 qualification, and side-wettable 10-pin TDFN package.
Technical Context
The MAX20478BATBG/VY+T implements three independent voltage monitor channels: IN1 and IN2 support 0.5V–3.6875V in 12.5mV steps; IN3 supports 0.5V–5.6V in 20mV steps. Each channel offers separately programmable overvoltage (102.5–110%) and undervoltage (90–97.5%) thresholds with ±0.8% accuracy.
It integrates a windowed watchdog timer with WDI input and WDDIS control, OTP-based configuration with error-correcting code, dual programmable reset outputs (RESET1/RESET2), and internal reference generation. All functions are validated for ASIL D compliance per ISO 26262.
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 external regulation. |
| Input Voltage Monitoring Range | IN1/IN2: 0.5V–3.6875V (12.5mV steps); IN3: 0.5V–5.6V (20mV steps) - enables flexible rail monitoring across MCU cores, I/O, and analog supplies. |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection under temperature and aging without calibration overhead. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and ECU module environments per AEC-Q100 Grade 0. |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems. |
| Watchdog Type | Windowed - prevents false resets from stuck or slow-clock conditions in safety-critical microcontrollers. |
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 and monitoring circuitry. |
| GND | Ground reference | Common return path for all analog and digital blocks; connects to exposed pad for thermal and EMI control. |
| IN1, IN2, IN3 | Monitor input channels | Three independent analog inputs; IN1/IN2 scale to 0.5V–3.6875V, IN3 to 0.5V–5.6V. |
| RESET1, RESET2 | Programmable reset outputs | Open-drain outputs configurable per channel for system-level reset sequencing or fault isolation. |
| WDI | Watchdog input | Asynchronous input requiring periodic toggling; failure triggers windowed timeout and RESET assertion. |
| WDDIS | Watchdog disable control | Active-low pin enabling hardware disable of watchdog during debug or safe boot phases. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Fully certified per ISO 26262 for use in safety-critical automotive domains including ADAS and autonomous driving control units. |
| Triple independent voltage monitors | Enables simultaneous supervision of core, I/O, and auxiliary rails without external resistive dividers or op-amps. |
| OTP with ECC | One-time-programmable configuration memory with error-correcting code ensures robust startup behavior and immunity to bit corruption. |
| Side-wettable TDFN | Facilitates automated solder-joint inspection via AOI, improving manufacturing yield and field reliability in automotive production. |
| Windowed watchdog | Detects both stuck-high and stuck-low WDI signals, preventing unsafe silent failures in microcontroller supervision. |
Applications
| Advanced Driver-Assistance Systems (ADAS) | Autonomous Driving Processing Units |
|---|---|
Use Scenario: Real-time voltage supervision of radar SoC, camera ISP, and sensor fusion MCU power rails. IC Role / Device Role / Timing Role: Triple-rail monitor with ASIL D fault reporting and windowed watchdog for fail-safe domain controller reset. Use Value: Eliminates need for discrete supervisors and reduces BOM count by ≥3 components while maintaining ISO 26262 diagnostic coverage. | Use Scenario: Power integrity monitoring across heterogeneous compute clusters (CPU, GPU, AI accelerator) in L3/L4 autonomous platforms. IC Role / Device Role / Timing Role: Centralized voltage supervisor coordinating multi-rail sequencing and watchdog handshaking with safety MCU. Use Value: Enables deterministic reset propagation and diagnostic logging via OTP-configured thresholds and dual RESET outputs. |
| Remote Sensor Modules | Power System Supervision |
Use Scenario: Compact battery-powered radar or LiDAR node requiring low-quiescent-current rail monitoring and watchdog protection. IC Role / Device Role / Timing Role: Low-power voltage monitor with 125µA operation and side-wettable TDFN for space-constrained modules. Use Value: Supports >10-year battery life in always-on sensing nodes while meeting AEC-Q100 Grade 0 thermal requirements. | Use Scenario: Supervision of PMIC output rails feeding safety-critical microcontrollers in body control modules. IC Role / Device Role / Timing Role: ASIL D-compliant supervisor interfacing with PMIC status pins and generating synchronized RESET signals. Use Value: Provides traceable fault reporting and configurable UV/OV hysteresis to prevent spurious resets during load transients. |
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); identical supply, accuracy, watchdog, and package. | Lacks IN3 monitoring capability - unsuitable where >2 rails require supervision. | Select when only dual-rail monitoring is needed and cost optimization is prioritized. |
| TLV809E33DBVR | Single-channel 3.3V supervisor with fixed thresholds; no watchdog, no OTP, no ASIL D certification. | Not suitable for safety-critical systems; limited to non-ASIL applications like infotainment power sequencing. | Use only in non-safety subsystems where triple monitoring, programmability, and functional safety are not required. |
Compared with MAX20478BATBG/VY+T, MAX20477BATBG/VY+ offers identical performance for dual-rail use but omits IN3, while TLV809E33DBVR lacks ASIL D compliance, programmability, and multi-rail capability - making it unsuitable for ADAS or autonomous driving deployment.
Availability
MAX20478BATBG/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.
Supply support for MAX20478BATBG/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 reduce component count and improve diagnostic coverage in ADAS and autonomous driving systems.
FAQ
What is the maximum number of voltage rails monitored by the MAX20478BATBG/VY+T?
The MAX20478BATBG/VY+T monitors up to three independent voltage rails: IN1 and IN2 support 0.5V–3.6875V ranges, while IN3 supports 0.5V–5.6V. This triple-monitor capability is factory-configured and cannot be reduced to two inputs - unlike the pin-compatible MAX20477BATBG/VY+, the MAX20478BATBG/VY+T is the three-input variant of the family.
Does the MAX20478BATBG/VY+T support programmable reset delay times?
No, the MAX20478BATBG/VY+T does not provide user-programmable reset delay timers. RESET1 and RESET2 assertion timing is determined solely by internal comparator response and watchdog timeout windows. Delay configuration requires external RC networks or upstream logic - the MAX20478BATBG/VY+T itself asserts reset immediately upon threshold violation or watchdog timeout.
Is the MAX20478BATBG/VY+T pin-compatible with any other members of the MAX2047x family?
Yes, the MAX20478BATBG/VY+T shares identical 10-pin side-wettable TDFN (3mm × 3mm) packaging and pinout with MAX20477BATBG/VY+. Both devices have matching VDD, GND, IN1–IN3, RESET1, RESET2, WDI, and WDDIS placements - enabling layout reuse when upgrading from dual- to triple-rail monitoring, provided firmware and OTP configuration are updated accordingly.
What watchdog functionality does the MAX20478BATBG/VY+T provide?
The MAX20478BATBG/VY+T implements a windowed watchdog timer that requires periodic toggling of the WDI pin within a defined time window. It detects both stuck-high and stuck-low conditions on WDI, asserting RESET outputs if activity falls outside the upper or lower timeout bounds - a critical feature for detecting microcontroller lockup in ASIL D systems.
How is configuration stored in the MAX20478BATBG/VY+T?
Configuration data - including OV/UV thresholds, watchdog settings, and RESET pin behavior - is stored in one-time-programmable (OTP) memory with built-in error-correcting code (ECC). This ensures tamper-resistant, radiation-hardened startup behavior and eliminates reliance on external EEPROM or fuse-based programming, simplifying production and enhancing long-term reliability.
MAX20478BATBG/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)
MAX20478BATBG/VY+T FAQ
1.How can I place an order for MAX20478BATBG/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBG/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 MAX20478BATBG/VY+T reliable?
The price and inventory of MAX20478BATBG/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 MAX20478BATBG/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478BATBG/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBG/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBG/VY+T?
MAX20478BATBG/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBG/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 MAX20478BATBG/VY+T?
For technical support, including MAX20478BATBG/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBG/VY+T requirements.
6.How does Aetrix verify that MAX20478BATBG/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBG/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 MAX20478BATBG/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478BATBG/VY+T?
All MAX20478BATBG/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBG/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 MAX20478BATBG/VY+T part is unused and in its original packaging.
Return procedure for MAX20478BATBG/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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