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Analog Devices Inc./Maxim Integrated MAX20478AATBA/VY+T
- Part No.:
- MAX20478AATBA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478AATBA/VY+T.pdf
- Description:
- ASIL-D, 2-3 CHANNEL POWER SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:4,844
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Product details
Overview
MAX20478AATBA/VY+T from Analog Devices is an ASIL D-compliant automotive voltage monitor SoC with two configurable voltage inputs (IN1, IN2), programmable OV/UV thresholds (±0.8% accuracy), windowed watchdog, and operating supply range of 2.35V–5.50V. It supports advanced driver-assistance systems requiring precise power-rail supervision at -40°C to +125°C.
For engineers reviewing the MAX20478AATBA/VY+T datasheet, MAX20478AATBA/VY+T pinout, MAX20478AATBA/VY+T application, or MAX20478AATBA/VY+T equivalent, key selection factors include dual-input voltage monitoring resolution (12.5mV steps), OTP-configurable reset timing, AEC-Q100 qualification, and side-wettable 10-pin TDFN package for automated optical inspection.
Technical Context
The MAX20478AATBA/VY+T implements a fully integrated analog monitoring architecture with independent OV/UV comparators per input, each supporting 2.5%–10% threshold hysteresis and ±0.8% absolute accuracy over temperature. Its windowed watchdog accepts WDI pulses and asserts WDO on timeout or out-of-window violation.
Configuration is stored in on-chip OTP memory with ECC protection; RESET1 and RESET2 are independently programmable open-drain outputs with adjustable delay and polarity. The device draws only 125µA quiescent current and requires no external passive components beyond VDD decoupling.
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 tracking of core logic or I/O supply voltages |
| Input Voltage Monitoring Range (IN3) | Not applicable - MAX20478A variant has only two monitored inputs (IN1, IN2) |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection across full -40°C to +125°C operating range |
| Quiescent Current | 125µA - minimizes standby power impact in always-on vehicle subsystems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and ADAS ECU environments |
| AEC-Q100 Grade | Grade 0 - certified for automotive safety-critical applications |
Pinout & Package
MAX20478AATBA/VY+T is housed in a 10-pin side-wettable TDFN package (3mm × 3mm) with exposed thermal pad, enabling solder joint inspection and enhanced thermal performance in high-reliability automotive PCB assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; requires local 100nF ceramic decoupling |
| GND | Ground reference | Common return path for all analog and digital circuitry |
| IN1, IN2 | Monitored voltage inputs | High-impedance analog inputs for rail supervision (0.5V–3.6875V range) |
| RESET1, RESET2 | Programmable open-drain reset outputs | Configurable delay, polarity, and assertion behavior via OTP |
| WDI | Watchdog input | Accepts pulse train; triggers windowed timeout if frequency or duty cycle deviates |
| WDO | Watchdog output | Open-drain fault indicator asserted on watchdog violation |
| REF | Internal reference output | Provides stable 1.25V reference for external circuit use |
| VOFF | Output disable control | Active-low pin to globally disable RESET1/RESET2 outputs |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Meets ISO 26262 requirements for safety-critical automotive monitoring functions |
| Side-wettable TDFN | Enables automated optical inspection (AOI) of solder joints for zero-defect manufacturing |
| OTP with ECC | Ensures robust configuration storage immune to bit flips during vehicle lifetime |
| Windowed watchdog | Detects both stuck-high and stuck-low WDI conditions, preventing silent failures |
| No external components required | Reduces BOM count and board area vs. discrete supervisor + watchdog solutions |
Applications
| Advanced Driver-Assistance Systems (ADAS) | Autonomous Driving Processing Units |
|---|---|
Use Scenario: Real-time monitoring of camera sensor power rails and SoC core supplies in forward-facing ADAS ECUs. IC Role / Device Role / Timing Role: Dual-input voltage supervisor ensuring safe shutdown before undervoltage-induced image corruption or data loss. Use Value: ±0.8% threshold accuracy prevents false resets during load transients while maintaining fail-safe response to actual brownouts. | Use Scenario: Supervision of multiple voltage domains (e.g., AI accelerator core, memory interface, I/O) in zonal compute architectures. IC Role / Device Role / Timing Role: Centralized power integrity monitor coordinating RESET1/RESET2 sequencing with watchdog timeout alignment to processor boot states. Use Value: OTP-programmable reset delays eliminate need for external RC networks, reducing layout complexity and variance. |
| Remote Sensor Modules | Power System Supervision |
Use Scenario: Compact battery-powered radar or LiDAR node requiring ultra-low quiescent current and reliable cold-cranking operation. IC Role / Device Role / Timing Role: Low-power voltage monitor with 125µA IQ enabling continuous supervision during vehicle sleep mode. Use Value: 2.35V minimum VDD allows operation down to weak battery conditions without compromising OV/UV detection fidelity. | Use Scenario: Redundant power monitoring in domain controllers where failure of primary supervisor must trigger immediate fallback. IC Role / Device Role / Timing Role: ASIL D-compliant secondary supervisor cross-checking primary rail monitors and asserting independent reset signals. Use Value: Side-wettable package supports AOI traceability, critical for functional safety audit and field failure root-cause analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477AATBA/VY+T | Single-input variant (IN1 only); identical package, OTP, watchdog, and accuracy specs | Lacks second monitored input - suitable only when one rail requires supervision | Select MAX20477AATBA/VY+T to reduce cost and complexity where dual-input capability is unnecessary |
| TLV809EADBZR | Single-channel 3.0V fixed-threshold supervisor; no watchdog, no OTP, no AEC-Q100 Grade 0 rating | Supports basic reset generation only; not suitable for ASIL D or multi-rail systems | Choose TLV809EADBZR only for non-safety-critical, single-supply consumer-grade modules |
Compared with MAX20478AATBA/VY+T, the MAX20477AATBA/VY+T offers identical safety and precision but removes IN2 monitoring - ideal for cost-sensitive single-rail designs - while the TLV809EADBZR lacks ASIL D compliance, programmability, and multi-input capability, limiting it to basic reset applications.
Availability
MAX20478AATBA/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 MAX20478AATBA/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 for industrial, automotive, communications, and consumer applications.
The MAX20478 product line delivers ASIL D-compliant, highly integrated power supervisors targeting next-generation automotive ECUs where space, reliability, and functional safety are critical design constraints.
FAQ
What is the function of the VOFF pin on the MAX20478AATBA/VY+T?
The VOFF pin on the MAX20478AATBA/VY+T is an active-low output disable control that globally disables both RESET1 and RESET2 outputs when pulled low. This allows system-level override of reset assertion during debug, firmware update, or safe maintenance modes. When VOFF is high or left floating (internal pull-up), RESET1 and RESET2 operate according to their OTP-programmed configurations. The pin does not affect watchdog or voltage monitoring functionality.
Does the MAX20478AATBA/VY+T support three voltage inputs?
No, the MAX20478AATBA/VY+T is the MAX20478A variant and supports exactly two voltage monitoring inputs (IN1 and IN2). The three-input capability is exclusive to the MAX20478B variant. Both variants share the same 10-pin TDFN package, watchdog, OTP configuration, and ASIL D compliance, but differ in input count and internal routing - confirmed by Analog Devices' ordering table and simplified block diagram.
What is the purpose of the REF pin on the MAX20478AATBA/VY+T?
The REF pin on the MAX20478AATBA/VY+T provides a buffered 1.25V internal reference voltage, derived from the bandgap and trimmed for stability. It can be used externally to bias precision comparators, ADC references, or sensor excitation circuits. Unlike typical reference outputs, REF remains active even when VDD drops below the UV threshold, supporting fail-safe diagnostics. Its output impedance is specified at 100Ω max.
Is the MAX20478AATBA/VY+T pin-compatible with any other Analog Devices voltage monitors?
The MAX20478AATBA/VY+T shares the same 10-pin side-wettable TDFN footprint with the MAX20477AATBA/VY+T (single-input variant) and MAX20479AATBA/VY+T (three-input variant), enabling drop-in replacement at the board level for certain revisions. However, pin functions differ: IN2 is NC on MAX20477, and IN3 replaces VOFF on MAX20479. Full functional compatibility requires OTP reprogramming and validation per application.
How is the windowed watchdog configured on the MAX20478AATBA/VY+T?
The windowed watchdog on the MAX20478AATBA/VY+T is configured via on-chip OTP memory and operates independently of microcontroller firmware. It expects periodic WDI pulses within a programmable time window; violation (too early, too late, or missing) asserts WDO. Timeout values, window width, and enable/disable state are set during factory programming and cannot be altered in-system. No external components are needed to define timing parameters.
MAX20478AATBA/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)
MAX20478AATBA/VY+T FAQ
1.How can I place an order for MAX20478AATBA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478AATBA/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 MAX20478AATBA/VY+T reliable?
The price and inventory of MAX20478AATBA/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 MAX20478AATBA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20478AATBA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478AATBA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478AATBA/VY+T?
MAX20478AATBA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478AATBA/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 MAX20478AATBA/VY+T?
For technical support, including MAX20478AATBA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478AATBA/VY+T requirements.
6.How does Aetrix verify that MAX20478AATBA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20478AATBA/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 MAX20478AATBA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20478AATBA/VY+T?
All MAX20478AATBA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478AATBA/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 MAX20478AATBA/VY+T part is unused and in its original packaging.
Return procedure for MAX20478AATBA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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