Analog Devices Inc./Maxim Integrated MAX6793TPSD3+

Overview

MAX6793TPSD3+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation across 5V–72V input and -40°C to +125°C ambient. It delivers up to 150mA per output (OUT1 = 3.3V fixed, OUT2 = 5V fixed), features 68μA quiescent current, 840mV typical dropout at 100mA (dual), and a 50ms capacitor-adjustable reset timeout - enabling reliable microcontroller startup and brownout recovery in engine control units.

For engineers reviewing the MAX6793TPSD3+ datasheet, MAX6793TPSD3+ pinout, MAX6793TPSD3+ application, or MAX6793TPSD3+ equivalent, key selection criteria include its dual-rail 3.3V/5V outputs, AEC-Q100-compatible thermal performance (2.7W dissipation in 5mm × 5mm TQFN), watchdog disable capability, and HOLD-input self-holding circuit support without external components.

Technical Context

The MAX6793TPSD3+ implements two independent LDO regulators: OUT1 is factory-set to 3.3V (±2.5% over temperature), OUT2 is fixed at 5.0V (±2.5%), both with internal current limiting (200–240mA short-circuit limit) and thermal shutdown at +165°C with 20°C hysteresis. Its RESET output asserts low when either regulated output drops below 87.5% of nominal (2.805V for OUT1, 4.250V for OUT2) and remains low for 50ms after recovery.

Supervisory logic includes a single-mode watchdog timer with fixed 280ms minimum timeout (CSWT tied to OUT1), disable via WD-DIS pin, and a power-fail comparator (PFI threshold = 1.231V ±0.5%) driving open-drain PFO. The HOLD input enables latch-up behavior: pulling HOLD low after ENABLE1 activation sustains regulation even if ENABLE1 returns low - critical for ignition-switched automotive subsystems.

Key Specifications

Pinout & Package

MAX6793TPSD3+ uses a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND for optimal thermal dissipation (2.7W max).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6794TPSD3+, the MAX6793TPSD3+ omits windowed watchdog logic - reducing pin count and firmware complexity - while retaining identical regulation, supervision, and thermal performance. Compared with TLV70733PDRVR, it adds 72V input tolerance, dual-rail capability, automotive qualification, and full supervisory suite - making it irreplaceable in demanding vehicle systems.

Availability

MAX6793TPSD3+ is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS camera modules, and telematics units requiring stable component supply across extended temperature and high-reliability automotive qualification.

Supply support for MAX6793TPSD3+ 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 family was engineered specifically for automotive power-supply supervision - integrating dual LDOs, watchdog, reset, power-fail detection, and reverse-battery protection into a single AEC-Q100-qualified TQFN package.

FAQ

What output voltages does the MAX6793TPSD3+ provide?

The MAX6793TPSD3+ provides two fixed outputs: OUT1 = 3.3V (±2.5% over -40°C to +125°C) and OUT2 = 5.0V (±2.5%). Both are factory-trimmed and require no external feedback components. The "S" in the part number confirms the 3.3V OUT1 option, and "D3" specifies the 50ms reset timeout period. This dual-rail configuration directly powers common automotive MCU + peripheral combinations without additional regulators.

How does the HOLD function work on the MAX6793TPSD3+?

The HOLD input on the MAX6793TPSD3+ enables a self-holding power circuit: after ENABLE1 is asserted to turn on OUT1, pulling HOLD low locks the regulator ON - maintaining output even if ENABLE1 is later deasserted. Releasing HOLD (letting it float or pulling high) shuts down OUT1/OUT2. This behavior eliminates external latch components and is ideal for ignition-switched automotive subsystems where power must persist beyond key-off transitions.

Is the MAX6793TPSD3+ qualified for automotive use?

Yes, the MAX6793TPSD3+ is AEC-Q100 qualified (Grade 0: -40°C to +125°C) and designed for under-hood automotive applications. It meets stringent requirements for thermal robustness (2.7W dissipation in 5mm × 5mm TQFN), input surge tolerance (72V max), and long-term reliability. The device includes integrated thermal shutdown (+165°C), short-circuit protection, and output overvoltage clamping - all validated across the full automotive temperature range.

Can the MAX6793TPSD3+ be used with a reverse-battery protection MOSFET?

Yes, the MAX6793TPSD3+ integrates reverse-battery protection drive via the GATEP pin, which sources up to 12V at 10mA to drive the gate of an external p-channel MOSFET. This eliminates the power loss and heat generation of a series Schottky diode. When reverse polarity is applied, GATEP turns off the pFET, blocking current flow while consuming only 68μA - a key advantage for always-on automotive modules.

What is the purpose of the WD-DIS pin on the MAX6793TPSD3+?

The WD-DIS (Watchdog Disable) pin on the MAX6793TPSD3+ provides hardware-level watchdog control: driving WD-DIS low disables the watchdog timer entirely, preventing RESET assertion regardless of WDI activity. This is essential for development, firmware updates, or diagnostic modes where continuous watchdog toggling is impractical. WD-DIS operates independently of WDS0/WDS1, offering deterministic disable without firmware involvement.