Analog Devices Inc./Maxim Integrated MAX6773BTALD3+

Overview

MAX6773BTALD3+ from Maxim Integrated is an automotive-grade micropower linear regulator with integrated supervisor and watchdog timer, delivering up to 100mA at 5.0V output (L option), operating from 4V to 72V input, featuring 38µA quiescent current, open-drain active-low RESET, and 50ms (typ) watchdog timeout - ideal for always-on vehicle control modules requiring reliable power sequencing and microprocessor supervision.

For engineers reviewing the MAX6773BTALD3+ datasheet, MAX6773BTALD3+ pinout, MAX6773BTALD3+ application, or MAX6773BTALD3+ equivalent, this page delivers verified technical context, exact pin functions, real-world automotive timing and reset behavior, thermal derating guidance, and validated alternative options for AEC-Q100-compliant system design.

Technical Context

The MAX6773BTALD3+ implements a high-voltage linear regulator with fixed 5.0V output (L suffix), active-high ENABLE, open-drain RESET with capacitor-adjustable timeout (D3 = 50ms typ), and a dedicated WDI input monitoring pulse trains for microprocessor health. Its supervisor logic asserts RESET when VOUT falls below 4.625V (L threshold) and holds it low for ≥50ms after recovery.

This variant belongs to the MAX6773B subfamily, distinguished by its 50ms (typ) watchdog timeout (vs. 1.6s in MAX6773), AEC-Q100 qualification, and TDFN-EP package with exposed pad tied to GND. It lacks HOLD and RESETIN pins, confirming single-enable, output-monitored supervision only - no adjustable reset threshold or self-hold functionality.

Key Specifications

Pinout & Package

MAX6773BTALD3+ uses a thermally enhanced 6-pin 3mm × 3mm TDFN-EP package (exposed pad soldered to PCB ground plane), rated for 1.951W continuous dissipation at TA ≤ +70°C with 23.8mW/°C derating above.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6773TALD3+, MAX6773BTALD3+ adds AEC-Q100 qualification and faster 50ms watchdog - essential for ISO 26262 ASIL-B systems; versus TLV70750PDQNR, it provides full automotive supervision (RESET timeout, watchdog, thermal protection) in a thermally robust TDFN package.

Availability

MAX6773BTALD3+ is available at Aetrix Electronics and suitable for automotive body electronics, engine management subsystems, and ADAS camera ECUs requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX6773BTALD3+ 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 micropower regulation with integrated supervision - targeting always-on modules needing ultra-low IQ, wide VIN, AEC-Q100 compliance, and robust fault detection.

FAQ

What is the watchdog timeout period for MAX6773BTALD3+?

The MAX6773BTALD3+ features a 50ms (typical) watchdog timeout period on the WDI input, as confirmed by the 'B' suffix in its part number. This is distinct from the 1.6s timeout of the non-B variants. The watchdog cannot be disabled and resets the internal counter on any rising or falling edge at WDI or upon RESET assertion. This value is guaranteed over the full −40°C to +125°C operating range.

Does MAX6773BTALD3+ support adjustable output voltage?

No, MAX6773BTALD3+ does not support adjustable output voltage. Its 'L' suffix denotes a fixed 5.0V output option. The SET pin is internally connected to GND for preset mode; external resistive dividers are not applicable. For adjustable outputs (1.8V–11V), select MAX6774B variants with 'T', 'S', 'Z', 'Y', 'W', or 'V' suffixes and use the SET pin with external resistors per the datasheet equation.

What is the RESET output type and drive capability of MAX6773BTALD3+?

MAX6773BTALD3+ provides an active-low, open-drain RESET output. It sinks up to 3.2mA while asserted (VOL ≤ 0.4V), requiring an external pullup resistor to the monitored system's logic rail (e.g., 3.3V or 5V). Leakage is ≤100nA when deasserted. This configuration allows wired-OR reset bus sharing across multiple supervisors - a key requirement in complex automotive ECUs.

Is MAX6773BTALD3+ qualified to AEC-Q100 standards?

Yes, MAX6773BTALD3+ is explicitly AEC-Q100 qualified, as indicated by the '/V+' suffix in its full ordering code and confirmed in the datasheet's "Ordering Information" table. It meets Grade 0 requirements (−40°C to +125°C operating temperature) and has undergone stress testing for automotive reliability, including HTOL, TC, and ESD. This qualification is mandatory for under-hood and safety-related applications.

What package type and thermal characteristics does MAX6773BTALD3+ have?

MAX6773BTALD3+ uses a 6-pin 3mm × 3mm TDFN-EP package with exposed pad (EP) internally connected to GND. At TA ≤ +70°C, it supports 1.951W continuous power dissipation; above +70°C, it derates at 23.8mW/°C. To achieve rated performance, the EP must be soldered to a solid 1in² 2oz copper ground plane per JESD51-3/5. This package enables reliable operation in high-ambient automotive environments.