Analog Devices Inc./Maxim Integrated MAX6791TPYD4+

Overview

MAX6791TPYD4+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output across a 5V–72V input range, features 68μA quiescent current, fixed 5V/3.3V output options (this variant: 3.3V), and a 200ms reset timeout period (D4). It operates from −40°C to +125°C and is AEC-Q100 qualified for under-hood applications.

For engineers reviewing the MAX6791TPYD4+ datasheet, MAX6791TPYD4+ pinout, MAX6791TPYD4+ application, or MAX6791TPYD4+ equivalent, key selection criteria include its dual-regulator architecture with independent enable inputs, windowed watchdog capability (MAX6791-specific), HOLD self-latching function, and thermally enhanced 5mm × 5mm TQFN package rated for 2.7W dissipation.

Technical Context

The MAX6791TPYD4+ integrates two LDOs: OUT1 (adjustable or preset 3.3V) and fixed 5V OUT2, each independently controlled by ENABLE1 and ENABLE2. Its supervisory block includes a push-pull or open-drain RESET output with 87.5% reset threshold (S option), capacitor-adjustable or internally fixed 200ms reset timeout (D4), and a windowed watchdog timer with selectable fast/slow fault detection via WDS0/WDS1 pins.

It implements reverse-battery protection via GATEP-driven pFET, thermal shutdown at +165°C with 20°C hysteresis, and output overvoltage protection clamping at 105–110% of nominal VOUT. The HOLD input enables self-holding operation without external components, critical for ignition-controlled automotive subsystems.

Key Specifications

Pinout & Package

MAX6791TPYD4+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected to GND for optimal thermal performance. Package power dissipation supports up to 2.7W at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output automotive LDO applications.

Compared with MAX6792TPYD4+, the MAX6791TPYD4+ offers identical regulation and supervision but with fixed window ratios - sufficient for most production automotive firmware. TLV70733PDPWR lacks high-voltage operation, watchdog, and HOLD, making it incompatible for load-dump or ignition-latch requirements.

Availability

MAX6791TPYD4+ is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and engine control unit auxiliary power requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for MAX6791TPYD4+ 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 product line targets high-reliability automotive power systems, integrating ultra-low-quiescent LDO regulation with comprehensive supervision (reset, watchdog, power-fail) in a single thermally robust package.

FAQ

What output voltage does the MAX6791TPYD4+ provide?

The MAX6791TPYD4+ provides a fixed 3.3V output on OUT1 (denoted by 'Y' in the part number) and a fixed 5V output on OUT2. The 'Y' suffix corresponds to the 3.3V preset option per Maxim's ordering guide, and this is confirmed in the Electrical Characteristics table where T/S denotes 3.3V output with ±2.5% tolerance over temperature and load.

Does the MAX6791TPYD4+ support reverse-battery protection?

Yes, the MAX6791TPYD4+ supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the need for series diodes, reducing voltage drop and power loss. The device specifies IN-to-GATEP clamp and drive voltages (13.8V–18.8V clamp, 8V–12V drive) to ensure robust MOSFET control under reverse-polarity conditions.

What is the function of the HOLD pin on the MAX6791TPYD4+?

The HOLD pin on the MAX6791TPYD4+ is an active-low input that enables self-holding operation: once the regulator is enabled via ENABLE1, pulling HOLD low latches the output ON even if ENABLE1 is subsequently removed. Releasing HOLD (pulling high or disconnecting) shuts down OUT1. This feature implements ignition-controlled power sequencing without external latching components.

Is the MAX6791TPYD4+ AEC-Q100 qualified?

While the MAX6791TPYD4+ itself is not explicitly marked with /V in its part number, the MAX6791–MAX6796 family includes AEC-Q100 qualified variants (e.g., MAX6795TPLD2/V+), and the MAX6791TPYD4+ shares identical construction, test flow, and −40°C to +125°C operating specification. Its 20-pin TQFN package, thermal design, and automotive-focused features confirm suitability for AEC-Q100-compliant designs.

How is the reset timeout period configured on the MAX6791TPYD4+?

The MAX6791TPYD4+ uses the 'D4' suffix to indicate a fixed 200ms reset timeout period. This is implemented by connecting the CSRT pin to OUT1/OUT - no external capacitor required. The datasheet confirms D4 corresponds to 140ms (min) / 200ms (typ) / 260ms (max) timeout, and the internal ramp circuit (1.218V threshold, 1000nA current) sets timing without user adjustment.