Analog Devices Inc./Maxim Integrated MAX6795TPSD1+T

Overview

MAX6795TPSD1+T from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. 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 12.5ms fixed reset timeout-ideal for engine control units under load-dump conditions.

For engineers reviewing the MAX6795TPSD1+T datasheet, MAX6795TPSD1+T pinout, MAX6795TPSD1+T application, or MAX6795TPSD1+T equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, watchdog disable capability via WD-DIS pin, HOLD self-hold functionality, and thermal protection up to +125°C ambient.

Technical Context

The MAX6795TPSD1+T implements a single high-side pFET-based LDO architecture with internal feedback loop referenced to SET pin, supporting either preset 3.3V output (L/M/T/S/Z/Y/W/V coding) or adjustable 1.8V–11V operation. Its RESET output asserts low when OUT drops below 87.5% of nominal (2.888V min at 3.3V), then holds for 12.5ms before deasserting.

Supervision includes a fixed 280ms watchdog timeout (CSWT tied to OUT), disableable via WD-DIS, and a power-fail comparator (PFI/PFO) with 1.231V threshold. The HOLD input enables latch-up behavior: once enabled, pulling HOLD low sustains regulation even after ENABLE goes low-critical for ignition-switched automotive subsystems.

Key Specifications

Pinout & Package

MAX6795TPSD1+T is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package (exposed pad connected to GND), rated for 2.7W power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6795TPLD2/V+, MAX6795TPSD1+T offers identical regulation and timing but uses open-drain RESET for flexible level-shifting; versus TLV70733PDQNR, it adds 72V tolerance, 300mA drive, watchdog, HOLD, and automotive temperature range-making it irreplaceable in under-hood systems.

Availability

MAX6795TPSD1+T is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS camera modules, and telematics systems requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX6795TPSD1+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 demanding industrial, automotive, and communications applications.

The MAX6791–MAX6796 family was engineered specifically for automotive power-supply supervision-integrating high-input-voltage LDOs, reset generators, watchdog timers, and reverse-battery protection into a single AEC-Q100-qualified package.

FAQ

What output voltage does MAX6795TPSD1+T deliver?

MAX6795TPSD1+T delivers a factory-preset 3.3V output with ±2.5% accuracy over -40°C to +125°C. This is confirmed by the "S" suffix in the ordering code (per Table 1), and the device supports no external adjustment unless modified per application note. The 3.3V rail is optimized for compatibility with modern automotive MCUs and communication peripherals.

Does MAX6795TPSD1+T include reverse-battery protection?

Yes, MAX6795TPSD1+T integrates 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 disables the MOSFET, blocking current flow and protecting downstream circuitry-eliminating the need for lossy series diodes and reducing thermal stress in automotive installations.

How is the reset timeout period configured on MAX6795TPSD1+T?

The reset timeout period on MAX6795TPSD1+T is set to 12.5ms (D2 option) by tying the CSRT pin to the OUT pin. This configuration uses the internal ramp generator and threshold (1.218V) to produce a fixed delay. No external capacitor is needed-this matches the "D2" designation in the part number and is validated across the full -40°C to +125°C temperature range.

Can the watchdog function be disabled on MAX6795TPSD1+T?

Yes, the watchdog function on MAX6795TPSD1+T can be fully disabled using the WD-DIS pin. Driving WD-DIS low disables the watchdog timer, preventing unintended RESET assertions during firmware development or safe-mode operation. This hardware-level disable is independent of WDI activity and is explicitly supported in the device's functional diagram and truth table.

What is the purpose of the HOLD pin on MAX6795TPSD1+T?

The HOLD pin on MAX6795TPSD1+T enables self-holding behavior: once ENABLE is asserted and regulation begins, pulling HOLD low maintains the output even if ENABLE returns low-mimicking a latched ignition switch. This eliminates external components in automotive start/stop systems and ensures regulated power remains active during transient key-off signals or contact bounce.