Analog Devices Inc./Maxim Integrated MAX6773TALD3+

Overview

MAX6773TALD3+ from Maxim Integrated is a micropower automotive linear regulator with integrated supervisor and watchdog timer, delivering 100mA at 5.0V output (L suffix), featuring 38µA quiescent current, 4V–72V input range, and 50ms fixed reset timeout (D3 suffix). It operates in -40°C to +125°C and includes open-drain RESET, thermal/short-circuit protection, and AEC-Q100 qualification for always-on vehicle modules.

For engineers reviewing the MAX6773TALD3+ datasheet, MAX6773TALD3+ pinout, MAX6773TALD3+ application, or MAX6773TALD3+ equivalent, key selection considerations include its 5V fixed output with 4.625V reset threshold, 1.6s watchdog timeout, ENABLE-controlled startup, and thermally enhanced 6-pin TDFN package - all critical for automotive power sequencing and microcontroller supervision.

Technical Context

The MAX6773TALD3+ integrates a high-voltage linear regulator (4V–72V input, 5V/100mA output) with a precision supervisor circuit that monitors OUT voltage against a factory-trimmed 4.625V reset threshold and asserts an active-low open-drain RESET for ≥50ms after recovery. Its watchdog timer (WDI input) triggers RESET if no edge occurs within 1.6s (typ), independent of output voltage monitoring.

This device uses a single active-high ENABLE input to control regulator turn-on/off and lacks HOLD or dual-enable logic - distinguishing it from MAX6767/MAX6771 variants. The TIMEOUT pin is internally configured for 50ms (D3), eliminating external capacitor requirements while retaining compatibility with adjustable timeout configurations via pin strap.

Key Specifications

Pinout & Package

MAX6773TALD3+ is housed in a thermally enhanced 3mm × 3mm, 6-pin TDFN-EP package (exposed pad soldered to PCB ground plane), rated for 1.951W dissipation at TA ≤ +70°C and derated above.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6773TALD4+, the MAX6773TALD3+ reduces reset assertion time by 75%, improving system responsiveness during transient recovery; versus TLV70750PDQNR, it integrates critical safety functions into one AEC-Q100-qualified package, eliminating BOM count and layout area for external reset ICs.

Availability

MAX6773TALD3+ is available at Aetrix Electronics and suitable for automotive ECU power supervision, body control module always-on rails, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX6773TALD3+ 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 automotive, industrial, and communications markets.

The MAX6765–MAX6774B family delivers micropower, high-voltage linear regulators with integrated supervision specifically for automotive always-on modules requiring ultra-low IQ, wide input range, and AEC-Q100 compliance.

FAQ

What is the watchdog timeout period for MAX6773TALD3+?

The MAX6773TALD3+ features a watchdog timeout period of 1.6 seconds (typical), with a guaranteed range of 1.12s to 2.08s across temperature and supply conditions. This timeout is fixed and cannot be disabled or adjusted. The watchdog monitors the WDI pin and asserts the RESET output if no rising or falling edge occurs within this window, ensuring reliable detection of microprocessor lockups in automotive systems.

Does MAX6773TALD3+ require external components to set its 5V output?

No, MAX6773TALD3+ does not require external components to set its 5V output. The "L" suffix indicates a factory-trimmed fixed 5.0V output; the SET pin is internally connected to ground. External resistors are only needed for adjustable-output variants (e.g., MAX6774 series with SET pin accessible). For MAX6773TALD3+, standard input (≥0.1µF) and output (≥10µF) bypass capacitors complete the minimal external component count.

Is MAX6773TALD3+ qualified for automotive use?

Yes, MAX6773TALD3+ is AEC-Q100 qualified (Grade 0) and specified for operation from -40°C to +125°C junction temperature. Its design includes overtemperature shutdown (160°C trip), short-circuit protection, and robust input transient handling - all validated for automotive power-supply applications such as engine control units and body control modules where reliability under harsh electrical and thermal conditions is mandatory.

What is the function of the TIMEOUT pin on MAX6773TALD3+?

On MAX6773TALD3+, the TIMEOUT pin is internally strapped to the OUT pin to enable the factory-configured 50ms reset timeout (D3 option). It requires no external capacitor or connection. If used in adjustable-mode variants, this pin accepts a capacitor to GND to set custom timeout periods - but for MAX6773TALD3+, leaving TIMEOUT unconnected or tied to OUT yields identical behavior, as the internal connection is hardwired.

Can MAX6773TALD3+ operate with input voltages below 5V?

Yes, MAX6773TALD3+ can operate with input voltages as low as 4V, though regulation is only guaranteed when VIN exceeds VOUT plus dropout voltage (620mV at 100mA → VIN ≥ 5.62V for 5V output). Below this, the device enters dropout mode with reduced output accuracy and increased sensitivity to load changes. It remains functional down to 4V but is not recommended for sustained 5V regulation below ~5.7V in production designs.