Analog Devices Inc./Maxim Integrated MAX6796TPSD4+T

Overview

MAX6796TPSD4+T from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 300mA at 3.3V output (preset), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 200ms capacitor-adjustable reset timeout - ideal for engine control units and ADAS domain controllers requiring robust brownout recovery.

For engineers reviewing the MAX6796TPSD4+T datasheet, MAX6796TPSD4+T pinout, MAX6796TPSD4+T application, or MAX6796TPSD4+T equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, 3.3V fixed output with 87.5% reset threshold, watchdog disable capability via WD-DIS, and thermal protection up to +125°C ambient.

Technical Context

The MAX6796TPSD4+T implements a single high-side pFET linear regulator with adjustable dropout control and internal 1.231V reference for PFI monitoring. Its RESET output is push-pull active-low with fixed 87.5% threshold relative to VOUT and user-selectable timeout via CSRT capacitor.

It integrates a fixed 280ms (min) watchdog timer with WD-DIS pin for hardware disable, HOLD input enabling self-holding latch behavior without external components, and reverse-battery protection via GATEP-driven p-channel MOSFET gate drive - all operating across –40°C to +125°C.

Key Specifications

Pinout & Package

MAX6796TPSD4+T is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND for optimal PCB heat dissipation (2.7W max).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6795TPSD2/V+, the MAX6796TPSD4+T provides longer reset hold-off for complex boot sequences; versus TLE42764GV50, it integrates watchdog, HOLD, and PFI - reducing BOM count and board area while enhancing functional safety.

Availability

MAX6796TPSD4+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, body electronics, and electric power steering systems requiring stable component supply across extended temperature and high-reliability qualification.

Supply support for MAX6796TPSD4+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 product line targets automotive power-supply supervision, delivering ultra-low-IQ regulation with integrated reset, watchdog, power-fail detection, and reverse-battery protection in a single AEC-Q100-qualified device.

FAQ

What output voltage does the MAX6796TPSD4+T deliver?

The MAX6796TPSD4+T delivers a fixed 3.3V output, as indicated by the 'S' in its part number. This voltage is tightly regulated across –40°C to +125°C and load currents up to 300mA, with typical accuracy of ±2.5% at 1mA and ±3.5% at full load. The 'D4' suffix specifies a 200ms reset timeout period, not output voltage variation.

How is the reset timeout period configured on the MAX6796TPSD4+T?

The MAX6796TPSD4+T uses the 'D4' option to select a factory-configured 200ms reset timeout period. This is implemented by connecting the CSRT pin to the OUT pin internally; no external capacitor is needed. For adjustable timing, a capacitor can be added between CSRT and GND - but doing so overrides the D4 setting and requires recalculating based on ramp current and threshold.

Does the MAX6796TPSD4+T support reverse-battery protection?

Yes, the MAX6796TPSD4+T supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When reverse polarity is applied, the internal circuitry pulls GATEP low to block current flow. This eliminates the need for series Schottky diodes, preserving efficiency and reducing thermal stress compared to passive solutions.

Can the watchdog function be disabled on the MAX6796TPSD4+T?

Yes, the watchdog function on the MAX6796TPSD4+T can be permanently disabled using the WD-DIS pin. Driving WD-DIS low disables the watchdog timer entirely - no WDI toggling is monitored, and no watchdog-induced resets occur. This provides hardware-level disable independent of firmware state, supporting safety-critical applications where software-controlled watchdogs are prohibited.

What is the purpose of the HOLD pin on the MAX6796TPSD4+T?

The HOLD pin on the MAX6796TPSD4+T enables a self-holding circuit: once ENABLE is asserted and the regulator starts, pulling HOLD low maintains regulation even if ENABLE returns low. Releasing HOLD shuts down the output. This eliminates external latch components and simplifies ignition-switch interfacing in automotive systems - a key feature distinguishing MAX6796TPSD4+T from standard LDOs.