Analog Devices Inc./Maxim Integrated MAX6795TPZD2+

Overview

MAX6795TPZD2+ from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions (RESET, watchdog, power-fail detection) for automotive systems. It operates from 5V to 72V input, delivers up to 300mA output current, features 68μA quiescent current, and provides a preset 5V output with 87.5% reset threshold and 12.5ms fixed reset timeout - used in engine control units to maintain microprocessor reliability during load-dump transients.

For engineers reviewing the MAX6795TPZD2+ datasheet, MAX6795TPZD2+ pinout, MAX6795TPZD2+ application, or MAX6795TPZD2+ equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, -40°C to +125°C operation, dual enable/hold logic for ignition-controlled self-holding, and adjustable watchdog timeout via CSWT capacitor.

Technical Context

The MAX6795TPZD2+ implements a single LDO regulator with internal pFET pass device, thermal shutdown at +165°C, short-circuit current limit of 400–480mA, and output overvoltage protection clamping at 105–110% of nominal VOUT. Its RESET output is push-pull active-low with 0.3V VOL at 50µA sink, and reset assertion occurs when OUT drops below 87.5% of 5V (i.e., 4.375V).

It integrates a fixed 280ms (min) watchdog timeout with fast/slow fault detection disabled (as this variant lacks WDS0/WDS1 pins), uses CSWT tied to OUT for fixed timing, and supports watchdog disable via WD-DIS pin. The HOLD input enables latch-up behavior by holding OUT on even after ENABLE goes low - critical for automotive "keep-alive" power sequencing.

Key Specifications

Pinout & Package

MAX6795TPZD2+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package (exposed pad connected to GND). The package supports 2.7W power dissipation and is rated for -40°C to +125°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage linear regulator with supervision applications.

Compared with MAX6795TPZD2+, the MAX6795TPSD2/V+ adds formal AEC-Q100 qualification and traceability for automotive production, while TLV70733PDPWR lacks high-voltage capability, supervision features, and latch functionality - making it unsuitable for direct replacement in battery-connected applications.

Availability

MAX6795TPZD2+ is available at Aetrix Electronics and suitable for automotive ECU design, ADAS power management, and telematics module development requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6795TPZD2+ 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 MAX6791–MAX6796 family was developed specifically for automotive power-supply supervision - integrating high-input-voltage regulation, ultra-low IQ, and robust fault monitoring into a single AEC-Q100-qualified package for engine control and safety-critical systems.

FAQ

What output voltage does the MAX6795TPZD2+ provide?

The MAX6795TPZD2+ provides a fixed 5V output voltage. This is confirmed by the "Z" in the part number suffix (per Maxim's ordering guide: Z = 5V output), and verified in the Electrical Characteristics table where VOUT is specified at 4.811V to 5.078V under 150mA load at VIN = 8V. The device also supports adjustable outputs from 1.8V to 11V when the SET pin is configured with an external resistor divider instead of being grounded.

Does the MAX6795TPZD2+ include watchdog functionality?

Yes, the MAX6795TPZD2+ includes a watchdog timer with fixed 280ms minimum timeout (tWD2), configurable via the CSWT pin. When CSWT is tied to OUT (as implemented in this variant), the watchdog operates in fixed-mode. It monitors the WDI pin for transitions and asserts RESET if no valid edge occurs within the timeout window. The WD-DIS pin allows hardware disable of the watchdog function.

What is the purpose of the HOLD pin on the MAX6795TPZD2+?

The HOLD pin on the MAX6795TPZD2+ enables self-holding circuit behavior: once ENABLE is asserted and the regulator starts, pulling HOLD low latches the output ON even if ENABLE subsequently goes low. Releasing HOLD (pulling high or leaving open) shuts down the regulator. This eliminates external latch components in automotive ignition-switched power architectures.

Is the MAX6795TPZD2+ AEC-Q100 qualified?

No, the MAX6795TPZD2+ is not AEC-Q100 qualified. The "/V+" suffix (e.g., MAX6795TPSD2/V+) denotes AEC-Q100 qualification; the "Z" suffix in MAX6795TPZD2+ indicates 5V output but no automotive qualification. However, it shares the same -40°C to +125°C operating temperature range and 20-pin TQFN package as qualified variants, making it suitable for industrial and prototyping use.

How is the reset timeout period set on the MAX6795TPZD2+?

The reset timeout period on the MAX6795TPZD2+ is set to 12.5ms (D2 option) by tying the CSRT pin to the OUT pin, as indicated by the "D2" in the part number. This configures the internal reset timeout generator to its 8.75ms (min) / 12.5ms (typ) / 16.25ms (max) setting. No external capacitor is required in this configuration.