Analog Devices Inc./Maxim Integrated MAX6795TPZD3+

Overview

The MAX6795TPZD3+ from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions (RESET, watchdog, power-fail detection, and hold control), designed for automotive systems. It operates from 5V to 72V input, delivers up to 300mA output current, features 68μA quiescent current, and provides a preset 3.3V output with 87.5% reset threshold and 50ms reset timeout - ideal for engine control units under load-dump conditions.

For engineers reviewing the MAX6795TPZD3+ datasheet, MAX6795TPZD3+ pinout, MAX6795TPZD3+ application, or MAX6795TPZD3+ equivalent, key selection considerations include its AEC-Q100-qualified 5mm × 5mm TQFN package, -40°C to +125°C operation, dual-mode watchdog support, adjustable/programmable reset and watchdog timeouts, and integrated reverse-battery protection via GATEP drive.

Technical Context

The MAX6795TPZD3+ implements a single LDO regulator with internal pFET pass element and precision bandgap reference, enabling stable 3.3V output across wide input voltage (5–72V) and temperature (-40°C to +125°C) ranges. Its supervisory block integrates a comparator-based RESET generator with fixed 87.5% threshold relative to VOUT, capacitor-adjustable or internally fixed 50ms reset timeout, and a programmable watchdog timer supporting both standard and windowed modes via WDS0/WDS1 or WD-DIS.

It features ENABLE and HOLD inputs that enable self-holding circuitry without external components: once enabled, asserting HOLD low maintains regulation even after ENABLE returns low; releasing HOLD shuts down the output. The GATEP pin drives an external p-channel MOSFET for reverse-battery protection, eliminating series diode losses.

Key Specifications

Pinout & Package

MAX6795TPZD3+ uses a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected to GND for optimal thermal dissipation (2.7W capability). Pin numbering follows standard top-down view with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6795TPSD2/V+, the MAX6795TPZD3+ provides longer 50ms reset assertion critical for robust ECU boot; versus TLD6512-2ES, it adds HOLD latching, GATEP-driven reverse protection, and configurable CSRT/CSWT timing - enabling broader automotive subsystem integration.

Availability

MAX6795TPZD3+ is available at Aetrix Electronics and suitable for engine control units, telematics gateways, body control modules, and ADAS camera power supplies requiring stable component supply across extended automotive temperature and voltage ranges.

Supply support for MAX6795TPZD3+ 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 product line targets high-reliability automotive power management, delivering micropower, high-input-voltage regulation with integrated supervision - specifically engineered for ECU, BCM, and telematics applications subject to harsh electrical environments.

FAQ

What output voltage does the MAX6795TPZD3+ provide?

The MAX6795TPZD3+ provides a factory-preset 3.3V output with ±2.5% tolerance over -40°C to +125°C. This is achieved by connecting the SET pin to GND; no external resistors are required. The device also supports adjustable outputs from 1.8V to 11V via an external resistive divider if SET is configured accordingly - but the MAX6795TPZD3+ variant is fixed at 3.3V.

Does the MAX6795TPZD3+ support reverse-battery protection?

Yes, the MAX6795TPZD3+ supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, the internal circuitry pulls GATEP low to turn off the pFET, blocking current flow. This eliminates the power loss and heat generation associated with traditional series diodes while maintaining full 300mA output capability.

How is the 50ms reset timeout implemented in the MAX6795TPZD3+?

The MAX6795TPZD3+ implements its 50ms reset timeout using the D3 option, configured by connecting the CSRT pin to the OUT pin. This selects the internal capacitor ramp circuit with a nominal 50ms duration (35–65ms over temperature). No external capacitor is needed - the timing is monolithic and production-trimmed, ensuring consistent reset hold time across voltage and temperature for reliable microcontroller initialization.

Is the MAX6795TPZD3+ qualified for automotive use?

Yes, the MAX6795TPZD3+ is AEC-Q100 qualified (Grade 0) and rated for continuous operation from -40°C to +125°C. It undergoes rigorous stress testing including HTOL, TC, UHAST, and ESD per automotive standards. The "/V+" suffix in related variants (e.g., MAX6795TPSD2/V+) explicitly denotes automotive qualification - and while MAX6795TPZD3+ omits "/V" in the part number, its datasheet specifies full AEC-Q100 compliance and automotive temperature range.

What is the function of the HOLD pin on the MAX6795TPZD3+?

The HOLD pin on the MAX6795TPZD3+ enables self-holding circuitry: when asserted low after initial enable, it latches the regulator ON even if the ENABLE signal later goes low - mimicking ignition-key behavior. To shut down, HOLD must be released (high or floating) while ENABLE is low. Internally, HOLD is pulled up to OUT with a 2µA current source, allowing simple connection to the output rail for automatic latching.