Analog Devices Inc./Maxim Integrated MAX6795TPTD4+

Overview

MAX6795TPTD4+ 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 output current, operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 200ms fixed reset timeout period (D4 code). It is used in engine control units (ECUs) to power microcontrollers under harsh battery transients.

For engineers reviewing the MAX6795TPTD4+ datasheet, MAX6795TPTD4+ pinout, MAX6795TPTD4+ application, or MAX6795TPTD4+ equivalent, key selection criteria include its AEC-Q100-qualified 5mm × 5mm TQFN package, 200ms reset timeout, 5V preset output (L option), 92.5% reset threshold, and watchdog disable capability via WD-DIS pin.

Technical Context

The MAX6795TPTD4+ implements a single LDO regulator with internal pFET pass element and supports adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V) output. Its RESET output is push-pull active-low with fixed 200ms timeout (D4), triggered when OUT drops below 92.5% of nominal voltage.

It integrates a watchdog timer with fixed 280ms minimum timeout (CSWT = OUT), disableable via WD-DIS, and includes HOLD functionality enabling self-holding circuitry without external components. Thermal shutdown activates at +165°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MAX6795TPTD4+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package 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 high-voltage supervisory regulator applications.

Compared with MAX6795TPTD4+, MAX6795TPLD2/V+ offers certified automotive qualification and shorter reset timing but same core regulation performance, while TPS7B8750QKVURQ1 reduces quiescent current by nearly half but shifts watchdog, HOLD, and PFI functionality to external components - increasing BOM count and layout complexity.

Availability

MAX6795TPTD4+ is available at Aetrix Electronics and suitable for engine control units, telematics gateways, ADAS cameras, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for MAX6795TPTD4+ 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 high-input-voltage regulation, ultra-low IQ, watchdog, reset, and reverse-battery protection in a single AEC-Q100-qualified package.

FAQ

What does the "D4" suffix in MAX6795TPTD4+ indicate?

The "D4" in MAX6795TPTD4+ specifies the reset timeout period: D4 corresponds to a fixed 200ms reset timeout (tRP), as defined in Table 2 of the MAX6791–MAX6796 datasheet. This value is set by internal circuitry when CSRT is connected to OUT, and it determines how long the RESET pin remains asserted after the regulated output recovers from a brownout condition. The MAX6795TPTD4+ uses this timing to ensure robust microcontroller initialization in automotive ECUs.

Is MAX6795TPTD4+ AEC-Q100 qualified?

No, MAX6795TPTD4+ is not AEC-Q100 qualified. Its ordering code lacks the "/V+" suffix, which denotes AEC-Q100 Grade 0 qualification (−40°C to +125°C). For automotive production applications requiring qualification, use MAX6795TPLD2/V+ or MAX6795TPSD2/V+. The MAX6795TPTD4+ is fully specified over −40°C to +125°C and shares identical electrical characteristics and packaging, but has not undergone the full AEC-Q100 stress test suite.

How is the 5V output configured on MAX6795TPTD4+?

The MAX6795TPTD4+ provides a factory-preset 5V output (L option), configured by tying the SET pin to GND. No external feedback resistors are needed. The output is guaranteed to be 4.850V to 5.150V at 300mA load and 8V input, with line regulation of ≤1% across 8V–72V input range. This preset mode simplifies design and improves accuracy versus resistor-based adjustment, making MAX6795TPTD4+ ideal for noise-sensitive MCU power rails.

Can the watchdog timer be disabled on MAX6795TPTD4+?

Yes, the watchdog timer on MAX6795TPTD4+ can be disabled using the WD-DIS pin. Driving WD-DIS low disables the watchdog function entirely, preventing RESET assertion due to WDI timeout. When WD-DIS is high or connected to OUT, the watchdog operates normally with fixed 280ms timeout (CSWT = OUT). This feature allows safe firmware updates or debug modes where continuous WDI toggling is impractical - a capability confirmed in the MAX6791–MAX6796 functional description and pin table.

What thermal performance does MAX6795TPTD4+ deliver in its TQFN package?

The MAX6795TPTD4+ in its 5mm × 5mm TQFN-EP package dissipates up to 2.7W continuously under typical PCB layout conditions (2-layer board, 1-in² copper pour under EP). Its thermal resistance θ_JA is 37.5°C/W, enabling full 300mA output at +125°C ambient when VIN = 14V and VOUT = 5V. The exposed pad (EP) must be soldered to a solid ground plane to achieve this rating - critical for under-hood applications like transmission control modules where ambient exceeds +105°C.