Analog Devices Inc./Maxim Integrated MAX6791TPZD1+T

Overview

The MAX6791TPZD1+T from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output across a 5V–72V input range, consumes only 68μA quiescent current, and features fixed 5V/3.3V/2.5V/1.8V or adjustable (1.8V–11V) outputs - enabling robust operation during load-dump transients in engine-control units.

For engineers reviewing the MAX6791TPZD1+T datasheet, MAX6791TPZD1+T pinout, MAX6791TPZD1+T application, or MAX6791TPZD1+T equivalent, key selection considerations include its dual-enable control (ENABLE1/ENABLE2), HOLD self-latching function, windowed watchdog timer (MAX6791-specific), and AEC-Q100-compatible thermal performance up to +125°C.

Technical Context

The MAX6791TPZD1+T implements two independent LDO regulators: OUT1 supports preset or adjustable output (1.8V–11V), while OUT2 provides a fixed 5V rail. Its supervisory block integrates a reset generator with 92.5%/87.5% output-dependent threshold detection and capacitor-adjustable timeout (35μs–200ms).

It features a windowed watchdog timer (tWD1 = 6.25ms min / tWD2 = 280ms min), selectable via WDS0/WDS1 pins, plus reverse-battery protection via GATEP-driven pFET. Thermal shutdown triggers at +165°C with 20°C hysteresis, and output overvoltage protection activates at 105–110% of nominal VOUT.

Key Specifications

Pinout & Package

MAX6791TPZD1+T uses a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, exposed pad). The exposed pad must be soldered to PCB ground for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output automotive LDO applications.

Compared with MAX6792TPZD1+T and TLV70733PDQNR, the MAX6791TPZD1+T uniquely combines dual 150mA outputs, 72V input tolerance, windowed watchdog, and HOLD latching - making it irreplaceable for primary automotive power-supply supervision where fault coverage and sequencing are mandatory.

Availability

MAX6791TPZD1+T is available at Aetrix Electronics and suitable for engine control units, ADAS cameras, body control modules, and telematics systems requiring stable component supply across extended temperature and high-reliability automotive environments.

Supply support for MAX6791TPZD1+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 automotive, industrial, and communications markets.

The MAX6791–MAX6796 family targets automotive power-supply supervision, integrating high-voltage LDOs with reset, watchdog, power-fail, and reverse-battery protection in a single compact package.

FAQ

What is the input voltage range supported by the MAX6791TPZD1+T?

The MAX6791TPZD1+T supports an input voltage range of 5V to 72V DC. This wide range enables operation across 12V and 24V automotive systems and allows the device to survive load-dump transients without external protection components. The absolute maximum rating is +80V on the IN pin, but continuous operation is specified up to +72V.

Does the MAX6791TPZD1+T provide dual independent outputs, and what are their capabilities?

Yes, the MAX6791TPZD1+T provides two independent outputs: OUT1 (adjustable 1.8V–11V or fixed 1.8V/2.5V/3.3V/5V) and OUT2 (fixed 5V only). Each output delivers up to 150mA continuously. OUT1 is controlled by ENABLE1 and HOLD; OUT2 is controlled by ENABLE2. Both outputs feature independent dropout, thermal, and overcurrent protection.

How does the windowed watchdog timer in the MAX6791TPZD1+T differ from standard watchdogs?

The MAX6791TPZD1+T implements a true windowed watchdog: it asserts RESET if the WDI signal remains static longer than tWD2 (e.g., 280ms) OR toggles faster than tWD1 (e.g., 6.25ms). This detects both frozen and runaway microcontroller states. Standard watchdogs only detect timeouts; the windowed architecture prevents false resets due to jitter and catches clock-speed faults.

Can the MAX6791TPZD1+T be used in AEC-Q100-compliant designs?

While the MAX6791TPZD1+T itself is not individually AEC-Q100 certified, it shares identical die, package, and qualification data with AEC-Q100 Grade-1 qualified variants MAX6795TPLD2/V+ and MAX6795TPSD2/V+. Its −40°C to +125°C operating range, thermal shutdown, and automotive-grade reliability testing make it suitable for AEC-Q100 system-level compliance when used per manufacturer guidelines.

What is the purpose of the HOLD pin on the MAX6791TPZD1+T, and how is it used?

The HOLD pin on the MAX6791TPZD1+T is an active-low latching input that keeps OUT1 enabled even after ENABLE1 returns low. Once OUT1 is active, pulling HOLD low "locks" the regulator ON. Releasing HOLD (to high or open) shuts down OUT1. This enables ignition-key hold circuits in automotive ECUs without external latches or microcontroller intervention.