Analog Devices Inc./Maxim Integrated MAX6773TASD2+T

Overview

MAX6773TASD2+T from Maxim Integrated is an automotive-grade micropower linear regulator with integrated supervisor and watchdog timer, delivering 100mA at 3.3V output from 4V–72V input, featuring 38µA quiescent current, open-drain active-low RESET, 12.5ms fixed reset timeout, and AEC-Q100 qualification for engine control modules.

For engineers reviewing the MAX6773TASD2+T datasheet, MAX6773TASD2+T pinout, MAX6773TASD2+T application, or MAX6773TASD2+T equivalent, key selection criteria include its 3.3V fixed output, 12.5ms reset timeout (D2 suffix), watchdog timeout of 1.6s (typ), TDFN-6 package with exposed pad, and enable-only control architecture - critical for always-on vehicle subsystems requiring low-power supervision.

Technical Context

The MAX6773TASD2+T implements a high-voltage linear regulation architecture with internal NPN pass transistor, supporting operation up to +125°C ambient. Its supervisor block monitors OUT voltage against a factory-trimmed 3.053V reset threshold (T suffix) and asserts an open-drain RESET signal for ≥12.5ms after recovery.

It integrates a non-disableable watchdog timer (WDI pin) that triggers RESET if WDI remains static >1.6s (typ); the watchdog clears on any edge transition or RESET assertion. The device uses a single ENABLE pin (active-high, 1.4V VIH min) with internal 0.6µA pulldown, and includes overtemperature shutdown at +160°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MAX6773TASD2+T is housed in a thermally enhanced 3mm × 3mm, 6-pin TDFN-EP package (package code T633+2) with exposed pad (EP) electrically connected to GND, enabling 1.9W power dissipation on multilayer PCBs (θJA = 41°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive supervisor-regulator applications.

Compared with MAX6773TASD3+T, the MAX6773TASD2+T provides tighter reset timing control for fast-recovery ECUs; compared with TLV70733PDQNR, it delivers integrated supervision and 72V tolerance essential for direct-battery automotive designs - eliminating BOM count and layout complexity.

Availability

MAX6773TASD2+T is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera ECUs, and telematics control units requiring stable component supply with AEC-Q100 assurance and long-term production support.

Supply support for MAX6773TASD2+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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6765–MAX6774B family was engineered specifically for automotive always-on modules, combining ultra-low quiescent current, wide-input voltage tolerance, and integrated supervision to replace discrete LDO + reset IC + watchdog solutions in ECUs and BCMs.

FAQ

What is the reset threshold voltage for MAX6773TASD2+T?

The MAX6773TASD2+T has a factory-trimmed reset threshold of 3.053V (T suffix), guaranteed from −40°C to +125°C. This value is specified in Table 2 of the datasheet and applies to the monitored OUT voltage - RESET asserts when OUT falls below this level and remains asserted for the full 12.5ms timeout after recovery. The MAX6773TASD2+T does not use an external RESETIN pin; its supervisor monitors the regulated output directly.

Does MAX6773TASD2+T support adjustable output voltage?

No, the MAX6773TASD2+T provides a fixed 3.3V output only. Its part number suffix "T" indicates the 3.3V option, and the internal feedback resistors are trimmed at wafer test. To achieve adjustable output (1.8V–11V), you would need a variant such as MAX6773TASD2+T's sibling MAX6774TASD2+T with SET pin access - but the MAX6773TASD2+T lacks the SET pin and is configured exclusively for fixed 3.3V operation per its pinout and functional diagram.

What is the watchdog timeout period for MAX6773TASD2+T?

The MAX6773TASD2+T features a non-disableable watchdog timer with a typical timeout period of 1.6 seconds, as confirmed in the Electrical Characteristics table (tWD = 1.12s to 2.08s). This watchdog monitors the WDI pin and asserts RESET if WDI remains static (high or low) beyond this window. The MAX6773TASD2+T cannot disable the watchdog - it clears only on WDI edge transitions or RESET assertion, making it suitable for safety-critical automotive firmware monitoring.

Can MAX6773TASD2+T be used in non-automotive applications?

Yes, the MAX6773TASD2+T is fully specified for −40°C to +125°C operation and offers robust protection (overtemperature, short-circuit, overvoltage), making it suitable for industrial controls, telecom power supplies, and harsh-environment instrumentation. While AEC-Q100 qualified, its 4V–72V input range, 38µA quiescent current, and integrated supervision provide value beyond automotive - though designers should verify that the 3.3V fixed output and 12.5ms reset timeout meet their specific system requirements.

What package type and thermal performance does MAX6773TASD2+T have?

The MAX6773TASD2+T uses a 3mm × 3mm, 6-pin TDFN-EP package (outline 21-0137) with exposed pad connected to GND. On a multilayer PCB, its thermal resistance is θJA = 41°C/W and θJC = 9°C/W, enabling up to 1.9W continuous power dissipation at +70°C ambient. Derating is 23.8mW/°C above +70°C. Proper soldering of the EP to the ground plane is mandatory to achieve rated thermal performance and reliability in automotive under-hood environments.