Analog Devices Inc./Maxim Integrated MAX6791EVKIT+

Overview

MAX6791EVKIT+ from Maxim Integrated is an evaluation kit for the MAX6791–MAX6796 family of ultra-low-quiescent-current, high-voltage linear regulators with integrated reset and watchdog supervision. It supports dual-output (150mA per rail) or single-output (300mA) configurations, operates from 5V to 72V input, consumes only 68μA quiescent current, and targets automotive power-supply monitoring and control applications.

For engineers reviewing the MAX6791EVKIT+ datasheet, MAX6791EVKIT+ pinout, MAX6791EVKIT+ application, or MAX6791EVKIT+ equivalent, this kit enables rapid validation of regulator startup behavior, reset timing accuracy, watchdog windowing functionality, thermal shutdown response, and reverse-battery protection circuitry under real-world load-dump and cold-crank conditions.

Technical Context

The MAX6791EVKIT+ implements the full functional block diagram of the MAX6791 IC - including dual LDOs (OUT1/OUT2), SET1 feedback network, push-pull/open-drain RESET output, capacitor-adjustable CSRT/CSWT timeout inputs, WDS0/WDS1 windowed watchdog select logic, HOLD self-hold circuit, and GATEP pFET driver - on a compact PCB with test points, jumpers, and onboard decoupling.

It replicates the 20-pin TQFN-EP package layout and signal routing of the MAX6791TP_D_+ device, supports all preset output voltages (1.8V/2.5V/3.3V/5V) and adjustable operation (1.8V–11V), and validates key automotive-grade specifications: -40°C to +125°C operation, AEC-Q100 alignment, 72V load-dump tolerance, and thermal shutdown at +165°C with 20°C hysteresis.

Key Specifications

Availability

MAX6791EVKIT+ is available at Aetrix Electronics and suitable for automotive ECU development, battery-management system prototyping, and industrial controller power-rail supervision requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for MAX6791EVKIT+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management solutions for automotive, industrial, and communications markets.

The MAX6791EVKIT+ belongs to Maxim's high-voltage supervisory regulator product line, designed specifically for automotive power-system robustness - enabling reliable microcontroller reset, watchdog supervision, and reverse-battery protection without external discrete components.

FAQ

What is the primary function of the MAX6791EVKIT+?

The MAX6791EVKIT+ is an evaluation platform for the MAX6791 dual-output linear regulator IC. It allows engineers to verify regulator performance - including low-quiescent-current operation (68μA), 5V–72V input tolerance, dual 150mA outputs, RESET timing, windowed watchdog behavior, HOLD self-hold functionality, and reverse-battery protection - before integrating the MAX6791 into final automotive or industrial designs.

Does the MAX6791EVKIT+ support both fixed and adjustable output voltages?

Yes. The MAX6791EVKIT+ supports all standard preset outputs (1.8V, 2.5V, 3.3V, 5.0V) for OUT1 and fixed 5V for OUT2, as well as adjustable OUT1 operation from 1.8V to 11V using the onboard SET1 resistive divider. Jumper-selectable configurations allow quick validation of different voltage combinations without soldering changes.

Can the MAX6791EVKIT+ demonstrate windowed watchdog functionality?

Yes. The MAX6791EVKIT+ fully implements the MAX6791's windowed watchdog timer via WDS0/WDS1 logic inputs and CSWT timeout adjustment. It validates fast-fault (tWDI < tWD1) and slow-fault (tWDI > tWD2) detection, RESET assertion for the configured timeout period, and watchdog disable via WD-DIS or WDS0/WDS1 states - all per the MAX6791 datasheet specifications.

How does the MAX6791EVKIT+ validate reverse-battery protection?

The MAX6791EVKIT+ includes a p-channel MOSFET driven by the GATEP output, replicating the MAX6791's internal reverse-battery protection circuit. When a negative input voltage is applied, GATEP shuts off the pFET, blocking reverse current flow while maintaining <27μA shutdown current - confirming the MAX6791EVKIT+'s ability to protect downstream circuitry during battery misconnection events.

Is the MAX6791EVKIT+ compatible with AEC-Q100 automotive qualification requirements?

Yes. The MAX6791EVKIT+ is built around the AEC-Q100-qualified MAX6791TP_D_+ IC and validates its full temperature range (-40°C to +125°C), thermal shutdown behavior (+165°C with 20°C hysteresis), and load-dump immunity (72V transient). While the kit itself is not certified, it provides complete functional and parametric verification of the AEC-Q100-compliant MAX6791 device.