Analog Devices Inc./Maxim Integrated MAX6791TPSD2+

Overview

MAX6791TPSD2+ 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 (OUT1 and OUT2), supports 5V to 72V input range, features 68μA quiescent current, and includes push-pull RESET, windowed watchdog timer, and HOLD-enabled self-holding circuitry - deployed in engine control units and body electronics requiring robust brownout recovery.

For engineers reviewing the MAX6791TPSD2+ datasheet, MAX6791TPSD2+ pinout, MAX6791TPSD2+ application, or MAX6791TPSD2+ equivalent, key selection criteria include its dual 5V outputs (OUT1 preset at 5V, OUT2 fixed 5V), D2-coded 12.5ms reset timeout, -40°C to +125°C AEC-Q100–compatible operation, and TQFN-20 thermal performance under load-dump conditions.

Technical Context

The MAX6791TPSD2+ implements two independent LDO regulators: OUT1 is adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V); OUT2 is fixed 5V. Its windowed watchdog monitors WDI transitions with selectable fast/slow fault detection (tWD1 = 12.5ms, tWD2 = 280ms min), and RESET asserts low when OUT1 drops below 92.5% of nominal voltage (4.625V for 5V output) for ≥35µs before timing out for 12.5ms.

It integrates reverse-battery protection via GATEP-driven pFET, thermal shutdown at +165°C with 20°C hysteresis, and power-fail comparator (PFI threshold = 1.231V) with 35µs propagation delay. ENABLE1 and ENABLE2 independently control OUT1 and OUT2, while HOLD sustains regulation after ENABLE1 release - enabling ignition-key–triggered latching without external components.

Key Specifications

Pinout & Package

MAX6791TPSD2+ is housed in a thermally enhanced 5mm × 5mm, 20-pin TQFN-EP package with exposed pad (EP) connected internally to GND for optimal PCB heat dissipation (2.7W continuous).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6792TPSD2+, the MAX6791TPSD2+ omits SET/SET1-based watchdog ratio programming but retains identical dual 5V outputs, 12.5ms reset timeout, and HOLD latching - making it optimal for cost-sensitive, fixed-window ADAS ECU designs. TLV70733PDQNR is incompatible due to absence of high-voltage support, supervision, and dual regulation.

Availability

MAX6791TPSD2+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, body control modules, and infotainment systems requiring stable component supply across extended temperature and harsh electrical environments.

Supply support for MAX6791TPSD2+ 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 delivers high-voltage, micropower linear regulators with integrated supervision - engineered specifically for automotive subsystems needing robust power integrity, fault detection, and AEC-Q100 reliability under extreme voltage and thermal stress.

FAQ

What output voltage options does the MAX6791TPSD2+ support?

The MAX6791TPSD2+ provides dual outputs: OUT1 is preset to 5V (as indicated by 'S' in the part number suffix), and OUT2 is fixed at 5V. OUT1 can also be adjusted from 1.8V to 11V using an external resistor divider on the SET1 pin. The device does not support 3.3V, 2.5V, or 1.8V presets in this specific variant - those require different suffix codes (e.g., 'T', 'Z', 'W').

How is the 12.5ms reset timeout configured on the MAX6791TPSD2+?

The MAX6791TPSD2+ uses the 'D2' suffix to denote a factory-trimmed 12.5ms reset timeout period. This is implemented internally - no external capacitor on CSRT is required. If a different timeout is needed, a capacitor must be connected from CSRT to GND, but that would deviate from the D2 specification and invalidate the guaranteed 12.5ms timing.

Does the MAX6791TPSD2+ support reverse-battery protection, and how is it implemented?

Yes, the MAX6791TPSD2+ 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 turn off the pFET, blocking current flow. No external diodes or controllers are needed - the feature is fully integrated and operational across the full -40°C to +125°C range.

Can the MAX6791TPSD2+ be used in single-output configurations?

No - the MAX6791TPSD2+ is a dual-output device with both OUT1 and OUT2 active. OUT1 is preset to 5V and OUT2 is fixed at 5V. To use only one output, the unused output must be loaded with ≥1mA and properly decoupled, but the device remains functionally dual-output. For true single-output operation, consider MAX6795TPSD2+ or MAX6796TPSD2+ instead.

What is the purpose of the HOLD pin on the MAX6791TPSD2+, and how is it typically used?

The HOLD pin on the MAX6791TPSD2+ enables a self-holding circuit: when driven low after ENABLE1 activation, it keeps OUT1 enabled even if ENABLE1 returns low - ideal for ignition-key–triggered power latching. HOLD is internally pulled up to OUT1 via a 2µA current source, so leaving it unconnected defaults to standard ENABLE1-controlled operation.