Analog Devices Inc./Maxim Integrated MAX6796TPWD4+T

Overview

MAX6796TPWD4+T from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions (RESET, watchdog, power-fail comparator, and hold control), designed for automotive systems requiring robust operation under load-dump conditions. It delivers up to 300mA output current, supports 5V–72V input range, features 68μA quiescent current, and provides fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V output - used in engine control units, ADAS domain controllers, and body electronics.

For engineers reviewing the MAX6796TPWD4+T datasheet, MAX6796TPWD4+T pinout, MAX6796TPWD4+T application, or MAX6796TPWD4+T equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, 200ms capacitor-adjustable reset timeout (D4 option), 280ms fixed watchdog timeout, thermal/short-circuit/overvoltage protection, and dual enable/hold logic for self-holding ignition sequencing.

Technical Context

The MAX6796TPWD4+T implements a single LDO regulator with internal pFET pass element and precision bandgap reference, supporting dropout as low as 130mV at 300mA (5V output). Its supervisory block integrates a comparator-based RESET generator with 92.5% or 87.5% threshold tracking of VOUT, a windowed-capable watchdog timer (though disabled on this variant per D4 suffix), and a 1.231V PFI comparator for battery monitoring.

It uses a dedicated HOLD input tied internally to OUT via a 2µA pullup, enabling latch-up behavior without external components; ENABLE is active-high with 0.5µA internal pulldown. The CSRT pin is configured for 200ms fixed reset timeout (D4 code), and CSWT is set for fixed 280ms watchdog timeout - confirmed by ordering code "WD4" and electrical specs Table 2.

Key Specifications

Pinout & Package

MAX6796TPWD4+T is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package (exposed pad connected to GND), rated for 2.7W power dissipation at +70°C ambient. The exposed pad must be soldered to PCB ground plane for thermal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage automotive LDO applications.

Compared with MAX6795TPWD4+T, the MAX6796TPWD4+T adds AEC-Q100 qualification for automotive reliability; compared with TLV70733PDPWR, it offers 72V input tolerance, 300mA output, and full supervisory suite - making it irreplaceable in direct-battery automotive power domains.

Availability

MAX6796TPWD4+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and body electronics requiring stable component supply across extended temperature and high-reliability automotive qualification.

Supply support for MAX6796TPWD4+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 precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and automotive applications.

The MAX6791–MAX6796 product line delivers high-voltage, micropower linear regulators with integrated supervision - engineered specifically for automotive subsystems needing direct battery connection, ultra-low IQ, and functional safety-aware reset/watchdog behavior.

FAQ

What output voltage options does the MAX6796TPWD4+T support?

The MAX6796TPWD4+T supports factory-preset output voltages of 5.0V, 3.3V, 2.5V, or 1.8V - selected by connecting the SET pin to GND. It also supports adjustable output from 1.8V to 11V using an external resistor divider between OUT, SET, and GND. The "WD4" suffix confirms watchdog and reset timeout configuration, not output voltage; output voltage is determined by the first placeholder in the ordering code (e.g., "TPWD4" implies 3.3V output).

Does the MAX6796TPWD4+T include reverse-battery protection?

Yes, the MAX6796TPWD4+T includes integrated reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss. When reverse battery is applied, the internal circuitry disables GATEP, turning off the pFET and blocking current flow - protecting downstream circuitry without external components.

How is the 200ms reset timeout implemented on the MAX6796TPWD4+T?

The MAX6796TPWD4+T achieves its 200ms reset timeout (D4 option) by connecting the CSRT pin to the OUT pin - selecting the internally fixed timeout value per Table 2 of the datasheet. This eliminates the need for an external timing capacitor. The reset pulse remains asserted for exactly 200ms after VOUT rises above the reset threshold (92.5% or 87.5% of nominal), ensuring reliable microcontroller initialization in automotive power-up sequences.

Can the watchdog function be disabled on the MAX6796TPWD4+T?

Yes, the watchdog function on the MAX6796TPWD4+T can be disabled by driving the WD-DIS pin low. When WD-DIS is low, the watchdog timer is inactive and will not assert RESET regardless of WDI state. If WD-DIS is left unconnected or tied to OUT, the watchdog remains enabled with its fixed 280ms timeout. This disable feature allows flexible use in systems where watchdog supervision is not required.

What thermal performance can be expected from the MAX6796TPWD4+T in a 5mm × 5mm TQFN package?

The MAX6796TPWD4+T in its 5mm × 5mm TQFN-EP package dissipates up to 2.7W continuously at +70°C ambient when the exposed pad is properly soldered to a multilayer PCB ground plane. Its thermal shutdown activates at +165°C with 20°C hysteresis, and the package's low junction-to-board thermal resistance enables stable 300mA operation even at +125°C ambient - critical for under-hood automotive placement.