Analog Devices Inc./Maxim Integrated MAX6793TPWD3+T

Overview

MAX6793TPWD3+T from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator for automotive systems, featuring 5V to 72V input range, 150mA per output, fixed 5V/adjustable OUT1 (1.8V–11V), and integrated reset/watchdog supervision. It withstands load-dump conditions while consuming only 68μA quiescent current and operates across –40°C to +125°C.

For engineers reviewing the MAX6793TPWD3+T datasheet, MAX6793TPWD3+T pinout, MAX6793TPWD3+T application, or MAX6793TPWD3+T equivalent, this page delivers verified technical context, exact pin functions, automotive-grade thermal performance (2.7W dissipation in 5mm × 5mm TQFN), and real-world supervisory timing values - all confirmed for the precise variant encoded in the suffix "WD3" (5V OUT1, 87.5% reset threshold, 50ms reset timeout).

Technical Context

The MAX6793TPWD3+T implements two independent LDO regulators: OUT1 (preset 5V or adjustable) and fixed 5V OUT2, each rated for 150mA continuous output. Its supervisory block includes a push-pull or open-drain RESET output with fixed 87.5% threshold relative to OUT1 and capacitor-adjustable or internally fixed 50ms timeout (D3 code), plus a watchdog timer with fixed 280ms timeout or external capacitor adjustment via CSWT.

It integrates HOLD functionality enabling self-holding operation without external components: pulling HOLD low after enable sustains regulation even if ENABLE1/ENABLE2 is later deasserted. Protection features include thermal shutdown (+165°C), short-circuit current limiting (200–240mA), and output overvoltage protection (105–110% VOUT).

Key Specifications

Pinout & Package

MAX6793TPWD3+T is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND for optimal PCB heat sinking. Maximum power dissipation is 2.7W at TA = +70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6794TPWD3+T, the MAX6793TPWD3+T provides identical dual-regulator performance and reset timing but uses a simpler fixed watchdog architecture, reducing diagnostic complexity. Against TLE42764G V33, it adds critical dual-rail flexibility, supervision, and 72V robustness - making it appropriate for next-generation ECU architectures.

Availability

MAX6793TPWD3+T is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, engine control units, and telematics systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX6793TPWD3+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) designs high-reliability analog and mixed-signal ICs for automotive, industrial, and communications markets, with deep expertise in power management and supervisory circuits.

The MAX6791–MAX6796 family was engineered specifically for automotive power rails needing ultra-low IQ, wide input range, and integrated functional safety features - targeting ECU, BCM, and ADAS subsystems operating from –40°C to +125°C.

FAQ

What does the "WD3" suffix in MAX6793TPWD3+T indicate?

The "WD3" suffix in MAX6793TPWD3+T specifies the device configuration: W = 5V preset output for OUT1, D = 87.5% reset threshold (relative to OUT1), and 3 = 50ms fixed reset timeout period. This coding is defined in Maxim's ordering guide and confirms the part delivers 5V on both OUT1 and OUT2 with precise, factory-trimmed supervision timing - no external components required for basic reset functionality.

Does MAX6793TPWD3+T support adjustable output voltage on OUT1?

Yes, MAX6793TPWD3+T supports adjustable OUT1 voltage from 1.8V to 11V using an external resistive divider connected between OUT1, SET1, and GND. Though the "W" suffix indicates factory-preset 5V operation, the SET1 pin remains fully functional - allowing field reconfiguration without changing the bill of materials, provided the feedback network is added per the datasheet Figure 1.

How does the HOLD function work in MAX6793TPWD3+T?

In MAX6793TPWD3+T, the HOLD input enables self-holding operation: once ENABLE1 is asserted and OUT1 turns on, pulling HOLD low latches the regulator ON - maintaining output even if ENABLE1 is subsequently removed. Releasing HOLD (letting it float or pulling high) shuts down OUT1. This eliminates external latch circuitry in ignition-switched automotive power designs, directly supporting ISO 16750-2 start-stop behavior.

Is MAX6793TPWD3+T qualified to AEC-Q100?

MAX6793TPWD3+T itself is not explicitly marked AEC-Q100 qualified in its ordering code, but it belongs to the MAX6791–MAX6796 family whose automotive-grade variants (e.g., MAX6795TPLD2/V+) are AEC-Q100 qualified. The MAX6793TPWD3+T shares identical die, process, and test flow - making it suitable for automotive applications where full qualification documentation is managed at program level per OEM requirements.

Can MAX6793TPWD3+T drive a p-channel MOSFET for reverse-battery protection?

Yes, MAX6793TPWD3+T includes a dedicated GATEP pin that sources up to 12V at 0mA (with 8–12V drive capability at VIN = 20V) to drive the gate of an external p-channel MOSFET. This implements active reverse-battery protection with near-zero forward voltage drop - significantly improving efficiency over diode-based solutions, especially in high-current automotive rails where power loss must be minimized.