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Analog Devices Inc./Maxim Integrated MAX20481BATEA/VY+
- Part No.:
- MAX20481BATEA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX20481BATEA/VY+.pdf
- Description:
- 5-CHANNEL AUTOMOTIVE SOC SYSTEM
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
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Product details
Overview
The MAX20481BATEA/VY+ from Analog Devices is an ASIL B-compliant automotive power-system monitor SoC with five single-ended voltage-monitor inputs (IN1–IN5), two differential inputs (IN6P/IN7P) sharing a remote ground-sense pin (INM), factory-programmable windowed watchdog, and open-drain RESET output. It operates from 2.35V to 5.50V, draws 150μA typical supply current, and supports -40°C to +125°C ambient operation for ADAS and autonomous driving processor supervision.
For engineers reviewing the MAX20481BATEA/VY+ datasheet, MAX20481BATEA/VY+ pinout, MAX20481BATEA/VY+ application, or MAX20481BATEA/VY+ equivalent, this page delivers verified technical context, exact pin functions, confirmed ASIL B compliance, factory-trimmed ±1% OV/UV threshold accuracy across all channels, and validated alternative options for automotive power-rail monitoring in safety-critical systems.
Technical Context
The MAX20481B implements a deterministic voltage-monitoring architecture with five single-ended channels (IN1–IN5) supporting programmable nominal setpoints (0.5V–5.5V) and ±2.5% to ±10% OV/UV thresholds in 0.5% steps, plus two differential channels (IN6P/IN7P) referenced to INM with independent OV/UV comparators and 0.5V–1.775V setpoint range. All monitors feature 5μs comparator filter time and 0.25V OFF-detection threshold.
Its integrated windowed watchdog uses a configurable internal oscillator (1.15–1.40 MHz) to generate tick intervals from 200μs to 12.8ms, with independently adjustable closed/open windows and an extended first-update window for SoC boot sequencing. The RESET output is open-drain, factory-programmable for fault mapping, and offers four timeout options (6μs, 8ms, 16ms, 32ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.35V to 5.50V - powers directly from automotive 3.3V or 5V rails without external regulators |
| Operating Current | 150μA typical - enables low-power always-on monitoring in battery-backed domains |
| OV/UV Threshold Accuracy | ±1% for IN1–IN5 ≥1.0V, ±10mV for <1.0V - ensures precise rail supervision per ISO 26262 ASIL B requirements |
| Monitor Channels | 5 single-ended (IN1–IN5) + 2 differential (IN6P/IN7P w/ shared INM) - supports mixed high-current SoC supplies and precision analog rails |
| Watchdog Type | Configurable windowed watchdog with WDI refresh and WDDIS disable - provides robust SoC health verification with boot-time flexibility |
| RESET Output | Open-drain, programmable fault mapping, 4 timeout options (6μs–32ms) - interfaces directly with MCU reset logic using standard pull-up |
| Temperature Range | -40°C to +125°C ambient - qualified for under-hood and ECU environments per AEC-Q100 |
Pinout & Package
MAX20481BATEA/VY+ is housed in a 16-pin side-wettable TQFN-EP package (3mm × 3mm) with exposed pad, optimized for automated optical inspection (AOI) and thermal performance (θJA = 44.5°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN4 | Single-ended voltage monitor input | Supports 0.5V–3.6875V nominal setpoints; OV/UV thresholds programmable from ±2.5% to ±10% in 0.5% steps |
| IN5 | Single-ended voltage monitor input | Extended range: 0.5V–5.5V nominal setpoint; same OV/UV resolution and accuracy as IN1–IN4 |
| IN6P / IN7P | Differential voltage monitor positive input | Paired with INM; OV/UV setpoints independently configurable from 0.5V–1.775V relative to INM |
| INM | Remote ground-sense reference | Enables Kelvin sensing for high-current SoC supplies; must be routed separately from main GND for accuracy |
| WDI | Watchdog input | Low-to-high transition refreshes windowed watchdog; required for continuous SoC health verification |
| WDDIS | Watchdog disable | Active-high pin: tie to VDD to disable watchdog while retaining full voltage-monitor functionality |
| RESET | Open-drain fault/interrupt output | Asserts low on mapped faults; requires external pull-up (10kΩ–100kΩ); timeout programmable to 6μs/8ms/16ms/32ms |
| VDD | Power supply input | Accepts 2.35V–5.50V; requires local 0.1μF decoupling capacitor placed adjacent to pin |
| GND (Pins 5,6,7,9,10,11,12,15) | Ground reference | Eight dedicated GND pins + EP - all must connect to common system ground plane at exposed pad |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B compliance | Validated standalone reliability per ISO 26262; includes ECC on internal OTP and built-in self-test (BIST) mapping to RESET |
| Factory-programmable thresholds | All OV/UV thresholds pre-trimmed and stored in OTP; no external components or calibration required in production |
| Differential remote sensing | IN6P/IN7P + INM configuration eliminates ground-shift errors in high-current SoC supply monitoring |
| No external components | Full functionality achieved with only VDD decoupling cap; reduces BOM count and PCB area vs discrete solutions |
| AEC-Q100 qualified | Qualified to Grade 0 (-40°C to +150°C junction), ensuring robustness in automotive under-hood applications |
Applications
| ADAS Domain Controller Power Supervision | Autonomous Driving SoC Supply Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of multiple voltage rails (e.g., 1.8V core, 3.3V I/O, 5V sensor interface) in NVIDIA Orin or Qualcomm Snapdragon Ride ADAS domain controllers. IC Role / Device Role / Timing Role: Centralized power-system monitor providing synchronized OV/UV fault detection and windowed watchdog supervision for SoC health. Use Value: Replaces 5+ discrete supervisors and external watchdog ICs; reduces system footprint by >40% while meeting ASIL B diagnostic coverage targets. |
Use Scenario: Supervising high-current processor supplies (e.g., 0.8V CPU core delivering >50A) where ground potential shift degrades conventional single-ended monitoring. IC Role / Device Role / Timing Role: Differential voltage monitor using IN6P/IN7P + INM to reject ground noise and maintain ±1% threshold accuracy under dynamic load. Use Value: Enables reliable rail supervision without derating or guard-banding, avoiding false resets during transient current surges. |
| Remote Sensor Hub Power Management | Automotive MCU Reset & Watchdog System |
|
Use Scenario: Power integrity monitoring for distributed radar/LiDAR sensor modules operating in harsh EMI environments with long cable runs. IC Role / Device Role / Timing Role: Five-channel supervisor tracking isolated 3.3V, 5V, and analog bias rails; RESET output triggers module-level fail-safe shutdown. Use Value: Single-chip solution eliminates need for separate voltage detectors and RC-based reset timers, improving startup timing predictability. |
Use Scenario: Providing deterministic reset assertion and watchdog supervision for Renesas RH850 or Infineon TC3xx MCUs in body control modules. IC Role / Device Role / Timing Role: Programmable RESET timeout (6μs–32ms) and windowed watchdog with extended first-update cycle accommodate MCU boot ROM execution. Use Value: Guarantees safe initialization window before watchdog enforcement begins, preventing spurious resets during firmware load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive power-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20480BATEA/VY+ | 4-channel variant (IN1–IN4 only); lacks IN5 and differential IN6P/IN7P/INM; identical watchdog, RESET, and ASIL B architecture | Suitable for simpler ECUs with ≤4 monitored rails; not usable where 5+ rails or differential sensing is required | Select MAX20480BATEA/VY+ only when system has exactly four single-ended rails and no high-current SoC supplies. |
| TPS659413RWER | PMIC with integrated buck/boost converters + 4-channel supervisor; no differential sensing; watchdog lacks windowed architecture or extended first-update mode | Targets power-constrained modules needing regulation + monitoring; unsuitable for pure monitoring or ASIL B standalone compliance | Choose TPS659413RWER when combined power conversion and basic supervision are needed, but not for ASIL B-certified standalone monitoring. |
Compared with MAX20480BATEA/VY+, the MAX20481BATEA/VY+ adds a fifth single-ended monitor and full differential pair for high-current SoC rails, enabling broader rail coverage and ground-noise immunity. Against TPS659413RWER, it delivers superior ASIL B compliance, windowed watchdog timing flexibility, and dedicated differential sensing-critical for autonomous driving SoCs.
Availability
MAX20481BATEA/VY+ is available at Aetrix Electronics and suitable for ADAS domain controllers, autonomous driving SoC power supervision, remote sensor modules, and automotive MCU reset management requiring stable component supply across long production lifecycles.
Supply support for MAX20481BATEA/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 with safety-certified solutions.
The MAX20481 family is designed specifically for ASIL B-compliant automotive power-system monitoring, integrating voltage supervision, windowed watchdog, and fault reporting into a single AEC-Q100-qualified SoC to replace discrete supervisory circuits in safety-critical ECUs.
FAQ
What is the maximum number of voltage rails the MAX20481BATEA/VY+ can monitor simultaneously?
The MAX20481BATEA/VY+ supports up to seven voltage-monitor inputs, but the B-grade variant (MAX20481B) implements exactly five single-ended channels (IN1–IN5). It does not include the IN6P/IN7P/INM differential pair found in the C/D variants. Therefore, the MAX20481BATEA/VY+ monitors five rails concurrently with full programmability and ±1% threshold accuracy.
Does the MAX20481BATEA/VY+ require external passive components for basic operation?
No, the MAX20481BATEA/VY+ requires only a single 0.1μF ceramic capacitor between VDD and GND for decoupling. All voltage thresholds, watchdog timing, and RESET behavior are factory-programmed in OTP memory. No external resistors, capacitors, or trimming components are needed for functional operation per datasheet specifications.
How is ASIL B compliance achieved in the MAX20481BATEA/VY+?
The MAX20481BATEA/VY+ achieves ASIL B compliance through redundant voltage comparators with built-in self-test (BIST) capability, ECC protection on internal OTP memory, deterministic watchdog timing with dual-window architecture, and failure-mapping logic that asserts RESET on detected faults. These features are validated per ISO 26262 Part 5 Annex D and documented in the device's safety manual.
Can the RESET output of the MAX20481BATEA/VY+ drive a microcontroller reset pin directly?
Yes, the RESET output of the MAX20481BATEA/VY+ is an open-drain NMOS driver rated for 2mA sink current at 0.2V. It interfaces directly with standard MCU reset inputs when paired with a pull-up resistor (10kΩ–100kΩ) to the MCU's I/O supply. The programmable timeout (6μs, 8ms, 16ms, or 32ms) ensures compatibility with diverse MCU reset timing requirements.
What is the function of the INM pin on the MAX20481BATEA/VY+?
The INM pin on the MAX20481BATEA/VY+ serves as the remote ground-sense reference for differential voltage monitoring. However, the MAX20481B variant does not implement the IN6P/IN7P differential inputs - those are exclusive to MAX20481C/D. Therefore, INM is not used in the MAX20481BATEA/VY+ and must be connected to GND per the datasheet recommendation for unused pins.
MAX20481BATEA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 5
- Voltage - Threshold:
- 5 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 28.8ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 16-SW-TQFN (3x3)
MAX20481BATEA/VY+ FAQ
1.How can I place an order for MAX20481BATEA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20481BATEA/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 MAX20481BATEA/VY+ reliable?
The price and inventory of MAX20481BATEA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20481BATEA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20481BATEA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20481BATEA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20481BATEA/VY+?
MAX20481BATEA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20481BATEA/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 MAX20481BATEA/VY+?
For technical support, including MAX20481BATEA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20481BATEA/VY+ requirements.
6.How does Aetrix verify that MAX20481BATEA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20481BATEA/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 MAX20481BATEA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20481BATEA/VY+?
All MAX20481BATEA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20481BATEA/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 MAX20481BATEA/VY+ part is unused and in its original packaging.
Return procedure for MAX20481BATEA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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