Analog Devices Inc./Maxim Integrated MAX6774TAYD4+

Overview

MAX6774TAYD4+ from Maxim Integrated is a micropower, high-voltage linear regulator with integrated watchdog timer and supervisor functionality. It operates from 4V to 72V input, delivers up to 100mA output at fixed 1.8V (Y suffix), features open-drain active-low RESET with 200ms timeout (D4), and is AEC-Q100 qualified for automotive always-on modules.

For engineers reviewing the MAX6774TAYD4+ datasheet, MAX6774TAYD4+ pinout, MAX6774TAYD4+ application, or MAX6774TAYD4+ equivalent, key selection criteria include its 38µA quiescent current, 1.8V/100mA regulated output, 1.6s watchdog timeout, thermal shutdown at +160°C, and operation across –40°C to +125°C.

Technical Context

The MAX6774TAYD4+ integrates a low-dropout linear regulator, precision reset supervisor with capacitor-adjustable timeout, and a 1.6s watchdog timer monitoring WDI pulses. Its SET pin enables fixed 1.8V output (Y) or adjustable 1.8V–11V operation via external resistor divider.

It uses an internal 1.233V reference for output regulation and reset threshold generation, supports push-pull or open-drain RESET output, and includes overtemperature and short-circuit protection. The device enters shutdown drawing only 3.3µA when ENABLE is low.

Key Specifications

Pinout & Package

MAX6774TAYD4+ is housed in a thermally enhanced 6-pin 3mm × 3mm TDFN-EP package (exposed pad connected to GND), rated for 1.951W power dissipation at TA ≤ +70°C with proper PCB copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory LDO applications.

Compared with MAX6774TAYD4+, MAX6774TATD4+ provides higher output voltage for legacy interfaces but increases dropout risk in low-VIN scenarios, while MAX6773TAYD4+ reduces system-level supervision capability by omitting the watchdog-requiring µP firmware to handle lockup detection.

Availability

MAX6774TAYD4+ is available at Aetrix Electronics and suitable for automotive ECU power management, ADAS camera modules, body control units, telematics systems, and industrial control panels requiring stable component supply across extended temperature ranges and high-reliability operation.

Supply support for MAX6774TAYD4+ 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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing robustness, integration, and low-power operation.

The MAX6765–MAX6774B family was developed specifically for automotive always-on subsystems, integrating micropower regulation, precise reset supervision, and watchdog monitoring in a single thermally efficient package.

FAQ

What is the output voltage and tolerance of the MAX6774TAYD4+?

The MAX6774TAYD4+ provides a fixed 1.8V output with ±2.5% initial accuracy over temperature and load. This is confirmed by Table 2 in the datasheet (Y suffix = 1.8V), and electrical characteristics show 1.746V to 1.854V min/max across 1mA–100mA load and –40°C to +125°C.

Does the MAX6774TAYD4+ include a watchdog timer, and what is its timeout value?

Yes, the MAX6774TAYD4+ includes a watchdog timer with a typical timeout of 1.6s, as specified for MAX6774 devices in the Electrical Characteristics table (tWD = 1.12s to 2.08s). The WDI pin must receive a rising or falling edge within this period to prevent RESET assertion.

What is the RESET timeout duration for the MAX6774TAYD4+, and how is it set?

The MAX6774TAYD4+ has a fixed 200ms RESET timeout, indicated by the D4 suffix per Table 1. This is achieved by connecting the TIMEOUT pin to the OUT pin; no external capacitor is required. The datasheet confirms D4 = 140µs to 260µs typical timeout.

What package type and thermal performance does the MAX6774TAYD4+ use?

The MAX6774TAYD4+ uses a 6-pin 3mm × 3mm TDFN-EP package with exposed pad (EP) connected to GND. At TA ≤ +70°C, it supports 1.951W continuous power dissipation; derating is 24.4mW/°C above +70°C, enabling 100mA operation in high-ambient environments.

Is the MAX6774TAYD4+ qualified for automotive applications?

Yes, the MAX6774TAYD4+ is AEC-Q100 qualified (Grade 0, –40°C to +125°C), as explicitly stated in the Features section and Ordering Information table. This qualification covers stress testing for temperature cycling, humidity, vibration, and ESD-required for under-hood and safety-critical automotive use.