Analog Devices Inc./Maxim Integrated MAX6794TPSD2+

Overview

MAX6794TPSD2+ 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 fixed 5V/3.3V outputs (this variant: 3.3V OUT1, fixed 5V OUT2), 68μA quiescent current, and AEC-Q100-qualified operation from –40°C to +125°C - enabling robust performance in engine control units and body electronics.

For engineers reviewing the MAX6794TPSD2+ datasheet, MAX6794TPSD2+ pinout, MAX6794TPSD2+ application, or MAX6794TPSD2+ equivalent, key selection criteria include dual-rail voltage supervision, capacitor-adjustable reset/watchdog timeout (D2 = 12.5ms reset, fixed 280ms watchdog), HOLD-enabled self-holding circuitry, and thermal protection under high-ambient automotive conditions.

Technical Context

The MAX6794TPSD2+ implements two independent LDO regulators: OUT1 (adjustable or preset 3.3V) and OUT2 (fixed 5V), each with dedicated enable (ENABLE1/ENABLE2) and shared HOLD functionality. Its supervisory block integrates a precision 1.231V PFI comparator, open-drain PFO, push-pull RESET with 92.5% threshold tracking (relative to OUT1), and a fixed 280ms watchdog timeout (CSWT tied to OUT1).

Reset assertion is triggered by OUT1 drop below threshold or watchdog fault; RESET remains low for 12.5ms (D2 code) after recovery. The device uses internal current sources for ENABLE1/ENABLE2 pulldown (0.5µA) and HOLD pullup (2µA), eliminating external biasing - critical for low-power always-on automotive modules.

Key Specifications

Pinout & Package

MAX6794TPSD2+ is housed in a thermally enhanced 20-pin TQFN-EP (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND for optimal PCB heat dissipation (2.7W capability). Pin functions are validated per Maxim's official pin description table for MAX6793/MAX6794.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6793TPSD2+, the MAX6794TPSD2+ adds windowed watchdog capability for enhanced fault discrimination; compared with TLV70733PDQNR, it delivers full automotive-grade dual-rail supervision, 72V tolerance, and integrated HOLD latching - making it irreplaceable in safety-critical vehicle networks.

Availability

MAX6794TPSD2+ is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS domain controllers requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX6794TPSD2+ 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 dual LDOs, watchdog timers, reset generators, and reverse-battery protection into a single AEC-Q100-capable package.

FAQ

What output voltages does the MAX6794TPSD2+ provide?

The MAX6794TPSD2+ provides two regulated outputs: OUT1 is preset to 3.3V (T/S coding), and OUT2 is fixed at 5V. Both outputs are independently enabled via ENABLE1 and ENABLE2. The 3.3V output is confirmed by electrical characteristics tables showing T/S conditions (3.206V–3.360V at 1mA load) and the part number suffix 'TPSD2+', where 'S' denotes 3.3V. This configuration supports dual-rail MCU systems common in automotive ECUs.

How is the reset timeout period configured on the MAX6794TPSD2+?

The MAX6794TPSD2+ uses the 'D2' suffix to indicate a factory-configured 12.5ms reset timeout period. Internally, CSRT is tied to OUT1, selecting the D2 option from Table 2 (8.75ms–16.25ms range). No external capacitor is required. This fixed timeout ensures consistent, production-tested reset duration for µP initialization after brownout recovery - critical for deterministic automotive boot sequences.

Does the MAX6794TPSD2+ support reverse-battery protection?

Yes, the MAX6794TPSD2+ 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 disables GATEP, turning off the MOSFET and blocking current flow. This eliminates the power loss and heat generation of traditional series diodes - a key advantage for high-efficiency automotive power designs.

What is the function of the HOLD pin on the MAX6794TPSD2+?

The HOLD pin on the MAX6794TPSD2+ is an active-low input that latches the regulator ON state. Once ENABLE1 is asserted and OUT1 begins regulating, pulling HOLD low maintains regulation even if ENABLE1 returns low - enabling self-holding circuits (e.g., ignition-key switched systems) without external components. Releasing HOLD shuts down OUT1. This feature is validated in the "Enable and Hold Inputs" section of the datasheet.

Is the MAX6794TPSD2+ AEC-Q100 qualified?

The MAX6794TPSD2+ itself is not marked with '/V+' and therefore is not explicitly AEC-Q100 qualified per the ordering table. However, the MAX6795TPSD2/V+ variant in the same family is certified. The MAX6794TPSD2+ shares identical die, 20-pin TQFN package, –40°C to +125°C operating range, and automotive-focused features (load-dump tolerance, thermal protection), making it suitable for many automotive applications where full qualification is not mandated.