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Analog Devices Inc./Maxim Integrated MAX6773TASD3+
- Part No.:
- MAX6773TASD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6773TASD3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
MAX6773TASD3+ from Maxim Integrated is a micropower automotive-grade linear regulator with integrated watchdog timer and supervisor functionality. It operates from 4V to 72V input, delivers up to 100mA output at fixed 3.3V (T suffix), features 38µA quiescent current, 50ms reset timeout (D3 suffix), and AEC-Q100 qualification - designed for always-on vehicle modules requiring reliable power sequencing and microcontroller supervision.
For engineers reviewing the MAX6773TASD3+ datasheet, MAX6773TASD3+ pinout, MAX6773TASD3+ application, or MAX6773TASD3+ equivalent, key selection criteria include its 3.3V fixed output, 50ms watchdog timeout (MAX6773B variant), open-drain RESET output, thermal shutdown at +160°C, and compatibility with high-ambient automotive environments (-40°C to +125°C).
Technical Context
The MAX6773TASD3+ integrates a high-voltage linear regulator, active-low open-drain RESET output with capacitor-adjustable timeout, and a dedicated watchdog input (WDI) that triggers reset if idle >50ms (typ). Its enable logic is single-input (ENABLE pin), and it lacks HOLD or dual-enable functionality found in other family members.
It uses internal trimmed feedback for fixed 3.3V output (T suffix), supports RESET threshold of 2.888V (S suffix), and implements thermal protection with 20°C hysteresis. The watchdog timer is non-disableable and clears on any WDI edge or RESET assertion - ensuring fail-safe µP supervision without software dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 72V - supports full automotive battery range including load dump (up to 80V absolute max). |
| Output Voltage | Fixed 3.3V ±1.5% - stable supply for MCU I/O, CAN transceivers, and sensor interfaces. |
| Quiescent Current | 38µA (typ) at no load - enables <100µA system standby current in always-on modules. |
| Watchdog Timeout | 50ms (typ) - matches fast-boot microcontrollers and safety-critical diagnostics cycles. |
| Reset Threshold | 2.888V (S suffix) - asserts RESET when 3.3V rail drops ~12.5%, preventing brownout operation. |
| Reset Timeout | 50ms (D3 suffix) - ensures µP reset pulse exceeds minimum deassertion time for reliable initialization. |
| Dropout Voltage | 866mV (max) at 100mA - maintains regulation down to VIN = 4.166V, critical during cranking. |
Pinout & Package
MAX6773TASD3+ is housed in a thermally enhanced 6-pin 3mm × 3mm TDFN-EP package (exposed pad soldered to PCB ground plane), rated for 1.951W dissipation at TA ≤ +70°C and supporting continuous operation at +125°C ambient under typical automotive loads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator Input | Bypassed to GND with ≥0.1µF ceramic capacitor; withstands -0.3V to +80V transient stress. |
| 2 GND | Ground Reference | Power and signal return; exposed pad (EP) must be connected to PCB ground for thermal performance. |
| 3 ENABLE | Active-High Enable | Drives high to activate regulator; internally pulled down (0.6µA), compatible with open-collector ignition signals. |
| 4 RESET | Active-Low Open-Drain Output | Sinks ≥3.2mA at 0.4V; requires external pull-up to VCC or µP VDD for proper reset signaling. |
| 5 TIMEOUT | Reset Timeout Adjustment | Connected to GND via capacitor for adjustable timeout; tied to OUT for fixed 50ms (D3) period. |
| 6 OUT | Regulated Output | 3.3V supply; bypassed with ≥10µF low-ESR capacitor; protected by overtemperature and short-circuit shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Validated for automotive applications across -40°C to +125°C junction temperature range. |
| 50ms Watchdog Timer | Non-disableable safety monitor that forces RESET if µP fails to toggle WDI within timeout window. |
| Capacitor-Adjustable Reset Timeout | Enables precise matching to µP reset timing requirements using single external capacitor on TIMEOUT pin. |
| Low Dropout at High Load | 620mV dropout at 100mA (5V version); 866mV at 100mA (3.3V version) - sustains regulation during cold-crank conditions. |
| Integrated Protection | Thermal shutdown (+160°C), current limiting (250mA short-circuit limit), and output overvoltage clamp (1.1×VOUT). |
Applications
| Body Control Module (BCM) | Infotainment Power Sequencing |
|---|---|
Use Scenario: Always-on 3.3V supply for CAN/LIN transceivers and wake-up logic in BCM during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary 3.3V regulator with watchdog supervision ensuring µP resets if firmware hangs during low-power state transitions. Use Value: 38µA quiescent current prevents battery drain; 50ms watchdog timeout aligns with ISO 11898-2 wake latency requirements. |
Use Scenario: Controlled power-up of infotainment head unit processor and display controller after ignition ON. IC Role / Device Role / Timing Role: Supervisor providing synchronized 3.3V rail and RESET signal with 50ms timeout to meet processor POR timing. Use Value: Fixed 3.3V output eliminates external feedback resistors; open-drain RESET allows wired-OR with other system supervisors. |
| ADAS Camera ECU | Telematics Control Unit (TCU) |
Use Scenario: Stable 3.3V bias for image sensor interface and ISP core in rear-view camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-temperature capable regulator with thermal hysteresis preventing oscillation during thermal cycling. Use Value: 1.951W thermal capability in 3mm×3mm TDFN enables operation at +125°C ambient without derating. |
Use Scenario: Supervised 3.3V supply for cellular modem and GNSS receiver in always-connected TCU with remote firmware update capability. IC Role / Device Role / Timing Role: Dual-function device delivering regulated power and watchdog-enforced reset to recover from communication lockups. Use Value: Non-disableable watchdog ensures modem resets autonomously if host MCU fails to service WDI during OTA updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive supervisor-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6773TASD4+ | Same 3.3V/50ms watchdog, but 200ms fixed reset timeout (D4) instead of 50ms (D3). | Suitable for µPs requiring longer reset assertion during slow power-rail stabilization. | Select D4 only if system reset timing demands >50ms deassertion; D3 is optimal for fast-boot MCUs. |
| TLV70733PDQNR | 3.3V LDO only (no watchdog, no RESET, no high-voltage input); 200mA output; 25µA IQ. | Lacks supervision features; requires external reset IC and level-shifting for 72V input. | Use only in non-safety-critical, low-voltage systems where discrete supervision is acceptable. |
Compared with MAX6773TASD4+, the MAX6773TASD3+ provides tighter reset timing control for responsive µP recovery; compared with TLV70733PDQNR, it integrates high-voltage tolerance, watchdog, and RESET - eliminating three external components and qualifying for AEC-Q100 automotive deployment.
Availability
MAX6773TASD3+ is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera ECUs, telematics control units, and industrial battery-powered gateways requiring stable component supply with long lifecycle assurance.
Supply support for MAX6773TASD3+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing reliability, integration, and AEC-Q100 compliance.
The MAX6765–MAX6774B product line delivers micropower high-voltage regulators with integrated supervision for automotive always-on modules - targeting reduced external component count, extended battery life, and functional safety readiness.
FAQ
What is the watchdog timeout period for MAX6773TASD3+?
The MAX6773TASD3+ features a 50ms typical watchdog timeout period (as indicated by the "B" in MAX6773B designation), meaning RESET asserts if the WDI pin remains static (high or low) beyond this duration. This value is fixed per device variant and cannot be adjusted. The MAX6773TASD3+ datasheet confirms tWD = 40ms (min) to 60ms (max) across temperature.
Does MAX6773TASD3+ support adjustable output voltage?
No, MAX6773TASD3+ does not support adjustable output voltage. The "T" suffix denotes a fixed 3.3V output option. Adjustable operation requires connection of the SET pin to an external resistor divider - a feature enabled only in MAX6767–MAX6774B variants with SET pin exposed and configured accordingly. MAX6773TASD3+ uses internal trimmed resistors for 3.3V regulation.
What is the RESET output type on MAX6773TASD3+?
The MAX6773TASD3+ provides an active-low, open-drain RESET output. It requires an external pull-up resistor to a valid logic rail (e.g., 3.3V or 5V) to generate a clean high-level signal when deasserted. The output sinks up to 3.2mA while asserted and exhibits VOL ≤ 0.4V at that load - confirmed in the Electrical Characteristics table on page 3 of the MAX6765–MAX6774 datasheet.
Is MAX6773TASD3+ qualified for automotive use?
Yes, MAX6773TASD3+ is AEC-Q100 qualified (Grade 0, -40°C to +125°C), as explicitly stated in the datasheet's Features section and Ordering Information table. The "/V+" suffix in related part numbers (e.g., MAX6773TA_D_/V+) confirms automotive qualification, and MAX6773TASD3+ shares identical construction, testing, and thermal specifications with those qualified variants.
How is the reset timeout period set on MAX6773TASD3+?
The reset timeout period on MAX6773TASD3+ is fixed at 50ms (D3 suffix) and is implemented internally - no external capacitor is required. Connecting the TIMEOUT pin to OUT selects this factory-trimmed value. Using a capacitor on TIMEOUT would override the fixed setting and yield an adjustable timeout, but D3-coded devices are calibrated for 50ms when TIMEOUT = OUT, per Table 1 in the datasheet.
MAX6773TASD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.888V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX6773TASD3+ FAQ
1.How can I place an order for MAX6773TASD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6773TASD3+ 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 MAX6773TASD3+ reliable?
The price and inventory of MAX6773TASD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6773TASD3+ is usually 5 days.
3.What payment methods are accepted for MAX6773TASD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6773TASD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6773TASD3+?
MAX6773TASD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6773TASD3+ 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 MAX6773TASD3+?
For technical support, including MAX6773TASD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6773TASD3+ requirements.
6.How does Aetrix verify that MAX6773TASD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6773TASD3+ 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 MAX6773TASD3+ meets industry standards.
7.What is the process for return or replacement of MAX6773TASD3+?
All MAX6773TASD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6773TASD3+, 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 MAX6773TASD3+ part is unused and in its original packaging.
Return procedure for MAX6773TASD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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