Analog Devices Inc./Maxim Integrated MAX6795TPSD3+

Overview

MAX6795TPSD3+ 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, operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 50ms fixed reset timeout - ideal for engine control units (ECUs) requiring robust brownout recovery under load-dump conditions.

For engineers reviewing the MAX6795TPSD3+ datasheet, MAX6795TPSD3+ pinout, MAX6795TPSD3+ application, or MAX6795TPSD3+ equivalent, key selection criteria include its AEC-Q100-qualified 5mm × 5mm TQFN package, 3.3V preset output with 87.5% reset threshold, watchdog disable capability, thermal/short-circuit protection, and HOLD-enabled self-holding circuit implementation without external components.

Technical Context

The MAX6795TPSD3+ implements a single LDO regulator with adjustable or preset output (here: 3.3V), dropout voltage of 420mV (typ) at 100mA, and internal 1.231V precision reference for PFI comparator and RESET threshold scaling. Its supervisory block integrates a fixed 50ms reset timeout (CSRT = D3), a 280ms min watchdog timeout (CSWT = OUT), and dual-mode watchdog disable via WD-DIS pin.

It uses an internal 2µA pull-up on HOLD and 0.5µA pulldown on ENABLE, enabling ignition-triggered latching behavior. The device supports reverse-battery protection via GATEP-driven pFET and includes overvoltage protection clamping OUT at 1.05–1.1×VOUT.

Key Specifications

Pinout & Package

MAX6795TPSD3+ is housed in a thermally enhanced 20-pin TQFN-EP (5mm × 5mm) with exposed pad (EP) connected internally to GND. The package supports ≤2.7W continuous power dissipation and is AEC-Q100 qualified for automotive use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6795TPLD2/V+, MAX6795TPSD3+ provides longer reset persistence (50ms vs. 12.5ms) for deeper brownout recovery, while TLV70733PDQNR lacks automotive qualification, supervision, and high-voltage capability - making it unsuitable as a functional replacement.

Availability

MAX6795TPSD3+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and stringent reliability standards.

Supply support for MAX6795TPSD3+ 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 MAX6795TPSD3+ belongs to the MAX6791–MAX6796 family of high-voltage micropower regulators with integrated supervision, engineered specifically for automotive subsystems demanding ultra-low IQ, wide input range, and AEC-Q100 compliance.

FAQ

What output voltage does the MAX6795TPSD3+ deliver, and how is it configured?

The MAX6795TPSD3+ delivers a factory-preset 3.3V output. This is configured by connecting the SET pin to GND - corresponding to the "T/S" option in Maxim's ordering guide. Output accuracy is ±1.5% over -40°C to +125°C, and the device supports adjustable outputs from 1.8V to 11V when SET is used with an external resistor divider. The MAX6795TPSD3+ does not require external feedback components for its 3.3V operation.

How does the reset timeout period work on the MAX6795TPSD3+?

The MAX6795TPSD3+ has a fixed 50ms reset timeout period (D3 option), implemented by connecting CSRT to the OUT pin. When VOUT drops below the 87.5% reset threshold (~2.89V at 3.3V), RESET asserts low and remains low for exactly 50ms after VOUT recovers above threshold. This ensures reliable microprocessor reset hold time during marginal supply recovery - critical for automotive ECUs meeting ISO 16750-2 startup requirements.

Can the watchdog timer on the MAX6795TPSD3+ be disabled, and how?

Yes, the watchdog timer on the MAX6795TPSD3+ can be disabled using the WD-DIS pin. Driving WD-DIS low disables the watchdog function entirely, preventing any WDI-related reset assertions. Alternatively, WD-DIS can be tied to OUT (3.3V) or left unconnected to keep the watchdog enabled. This hardware-disable feature allows safe firmware updates or debug modes without modifying WDI timing behavior.

What is the purpose of the HOLD pin on the MAX6795TPSD3+, and how is it used?

The HOLD pin on the MAX6795TPSD3+ enables a self-holding power circuit: when pulled low after initial enable, it keeps the regulator ON even if ENABLE returns low - eliminating need for external latching logic. In automotive use, ignition key signal drives ENABLE high at startup, then HOLD is asserted to maintain power during key-off states. Releasing HOLD shuts down the output. HOLD is internally pulled up to OUT with 2µA, so leaving it open defaults to standard ENABLE control.

Is the MAX6795TPSD3+ qualified for automotive applications, and what certifications does it hold?

The MAX6795TPSD3+ is AEC-Q100 qualified (Grade 0: -40°C to +125°C), as confirmed by its /V+ suffix variant (e.g., MAX6795TPSD2/V+). While MAX6795TPSD3+ itself carries the "+" lead-free marking and shares identical die and package construction, its qualification status derives from the family-level AEC-Q100 certification. It meets automotive requirements including load-dump immunity (72V), thermal shutdown (+165°C), and extended temperature operation - making it suitable for under-hood and cabin ECU deployments.