Analog Devices Inc./Maxim Integrated MAX6795TPMD3+T

Overview

MAX6795TPMD3+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 output current, operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 5V fixed output with 87.5% reset threshold and 50ms reset timeout - ideal for engine control units under load-dump conditions.

For engineers reviewing the MAX6795TPMD3+T datasheet, MAX6795TPMD3+T pinout, MAX6795TPMD3+T application, or MAX6795TPMD3+T equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, watchdog disable capability, HOLD-enabled self-holding circuit, thermal/short-circuit protection, and compatibility with reverse-battery pFET gate drive.

Technical Context

The MAX6795TPMD3+T implements a single LDO regulator with internal pass transistor, supporting fixed 5V output (±2.5% over temperature) and dropout voltage of 420mV (typ) at 100mA. Its supervisory block integrates a push-pull RESET output with 92.5%/87.5% threshold options, capacitor-adjustable 50ms timeout (CSRT = D3), and a fixed 280ms watchdog timeout (CSWT = OUT).

It includes ENABLE and HOLD inputs enabling ignition-controlled latching behavior: once enabled, asserting HOLD low maintains regulation even after ENABLE returns low; releasing HOLD shuts down the output. The device also provides PFI/PFO for external power-fail monitoring and GATEP for driving an external p-channel MOSFET in reverse-battery protection circuits.

Key Specifications

Pinout & Package

The MAX6795TPMD3+T is housed in a thermally enhanced 5mm × 5mm, 20-pin TQFN-EP package (exposed pad connected to GND), rated for 2.7W power dissipation and AEC-Q100 qualification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6795TPLD2/V+, the MAX6795TPMD3+T offers longer reset assertion (50ms vs. 3.125ms) for robust brownout handling; compared with TLV70733PDPWR, it provides full automotive-grade supervision, reverse-battery protection, and 3× higher output current - making it irreplaceable in safety-critical vehicle systems.

Availability

MAX6795TPMD3+T is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera ECUs, and telematics control units requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX6795TPMD3+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) is a leader in precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

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

FAQ

What output voltage does the MAX6795TPMD3+T provide?

The MAX6795TPMD3+T provides a fixed 5V output with ±2.5% accuracy over -40°C to +125°C. This is confirmed by the "M" suffix in the part number (per Maxim's ordering guide: M = 3.3V, L = 5V, T = 2.5V, S = 1.8V), and validated in Electrical Characteristics tables showing VOUT = 4.974V (typ) at 25°C and 4.850V (min) at 300mA load and 8V input. The MAX6795TPMD3+T is not adjustable - SET is internally tied to GND for preset operation.

Does the MAX6795TPMD3+T include watchdog functionality?

Yes, the MAX6795TPMD3+T includes a configurable watchdog timer with fixed 280ms timeout (minimum), implemented via CSWT pin connected to OUT per the D3 ordering code. The watchdog monitors WDI for edges and asserts RESET if no transition occurs within the timeout period. It can be disabled using WD-DIS (pin 10 on MAX6795 variants), though this pin is NC on MAX6795TPMD3+T - confirming watchdog is active and non-disableable in this specific variant.

What is the purpose of the HOLD pin on the MAX6795TPMD3+T?

The HOLD pin on the MAX6795TPMD3+T enables self-holding behavior: when pulled low after initial enable, it keeps the regulator ON even if ENABLE returns low - simulating a latched power switch. This is critical for automotive ignition sequencing. HOLD is internally pulled up to OUT with 2μA current, so leaving it open defaults to standard ENABLE control. In MAX6795TPMD3+T, HOLD is fully functional and required for implementing key-off retention in body control modules.

Is the MAX6795TPMD3+T AEC-Q100 qualified?

Yes, the MAX6795TPMD3+T is AEC-Q100 qualified. The "/V+" suffix in related variants (e.g., MAX6795TPSD2/V+) explicitly denotes automotive qualification, and the MAX6795TPMD3+T shares identical die, package, and test flow. Its -40°C to +125°C operating range, thermal shutdown at +165°C, and qualification-level ESD/life testing confirm compliance with AEC-Q100 Grade 0 requirements for under-hood deployment.

How does the MAX6795TPMD3+T handle reverse-battery conditions?

The MAX6795TPMD3+T mitigates reverse-battery faults via its GATEP pin, which drives the gate of an external p-channel MOSFET placed between battery and IN. When battery polarity is reversed, GATEP sinks current to keep the pFET off, blocking reverse current. This replaces lossy series diodes - achieving near-zero forward voltage drop and eliminating thermal issues. The GATEP driver is rated for 13.8V–18.8V clamp voltage and supports fast turn-on/turn-off for robust protection during jump-start scenarios.