Analog Devices Inc./Maxim Integrated MAX6796TPTD4+T

Overview

MAX6796TPTD4+T from Maxim Integrated is a single-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 300mA at 5V (±2.5% over -40°C to +125°C), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 200ms fixed reset timeout (D4 variant) with open-drain RESET output. It is used in engine control units (ECUs) and body electronics where load-dump resilience and low-power supervision are critical.

For engineers reviewing the MAX6796TPTD4+T datasheet, MAX6796TPTD4+T pinout, MAX6796TPTD4+T application, or MAX6796TPTD4+T equivalent, key selection criteria include its 72V input tolerance, AEC-Q100-qualified thermal performance (165°C shutdown), adjustable or preset 1.8V–11V output, watchdog disable capability, and HOLD-enabled self-holding circuit implementation without external components.

Technical Context

The MAX6796TPTD4+T integrates a single LDO regulator with internal pFET gate drive (GATEP) for reverse-battery protection, a precision power-fail comparator (PFI/PFO), and a dual-mode watchdog timer supporting fixed (280ms min) or capacitor-adjustable timeout. Its RESET output asserts low on OUT undervoltage or watchdog fault and holds low for exactly 200ms after recovery - confirmed by CSRT = D4 configuration per Table 2.

It implements HOLD functionality via an internal 2µA pull-up to OUT, enabling latch-on behavior when ENABLE is pulsed high then released while HOLD is pulled low; this eliminates need for external latching circuitry in ignition-switched automotive subsystems. All supervisory thresholds - reset (92.5% of VOUT), PFI (1.231V), SET (1.2315V) - are trimmed and temperature-stable across -40°C to +125°C.

Key Specifications

Pinout & Package

MAX6796TPTD4+T 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 max).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage linear regulator with supervision applications.

Compared with MAX6795TPTD4+T, the MAX6796TPTD4+T provides identical supervision and latch functionality but is specifically configured for 5V output; versus TPS7B8750QKVURQ1, it trades higher current for essential 72V resilience, HOLD latching, and adjustable output - making it irreplaceable in demanding automotive environments.

Availability

MAX6796TPTD4+T is available at Aetrix Electronics and suitable for engine control units, body control modules, and telematics systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MAX6796TPTD4+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 automotive, industrial, and communications markets.

The MAX6791–MAX6796 product line targets automotive power-supply supervision, delivering ultra-low-IQ regulation with integrated reset, watchdog, power-fail detection, and reverse-battery protection in a single 20-pin TQFN package.

FAQ

What output voltage does the MAX6796TPTD4+T deliver?

The MAX6796TPTD4+T is configured for a fixed 5V output (L option), with ±2.5% accuracy over -40°C to +125°C and line/load regulation ≤2%. It can also be reconfigured for 3.3V, 2.5V, or 1.8V using different ordering codes, or adjusted from 1.8V to 11V via external resistor divider on the SET pin. The "L" in MAX6796TPTD4+T explicitly denotes the 5V preset version.

Does the MAX6796TPTD4+T support reverse-battery protection?

Yes, the MAX6796TPTD4+T integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET to block reverse current flow. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss. The GATEP output is rated for 13.8V to 18.8V clamp voltage and supports fast turn-on/turn-off to protect downstream circuitry during accidental battery reversal.

How is the 200ms reset timeout implemented in the MAX6796TPTD4+T?

The 200ms reset timeout in MAX6796TPTD4+T is implemented via the D4 code in its ordering suffix, which configures the internal CSRT circuit for a fixed 200ms period (140ms to 260ms over temperature). No external capacitor is required - CSRT is internally connected to the appropriate reference, ensuring consistent timing without layout sensitivity or capacitor tolerance drift.

Can the watchdog function be disabled on the MAX6796TPTD4+T?

Yes, the watchdog function on MAX6796TPTD4+T can be disabled by driving the WD-DIS pin low. When WD-DIS is low, the watchdog timer is inactive and WDI transitions have no effect on RESET assertion. This allows flexible deployment - active supervision during runtime and safe disablement during firmware development or diagnostic modes - without requiring hardware changes.

What is the purpose of the HOLD pin on the MAX6796TPTD4+T?

The HOLD pin on MAX6796TPTD4+T enables a self-holding circuit: when pulled low after ENABLE is asserted, it latches the regulator ON even if ENABLE returns low. Releasing HOLD (pulling high or disconnecting) shuts down the output. This mimics ignition-switch behavior in automotive systems, eliminating external latch ICs or relays and simplifying power architecture for modules like seat controllers or HVAC nodes.