Analog Devices Inc./Maxim Integrated MAX6872ETJ+

Overview

The MAX6872ETJ+ from Maxim Integrated is an EEPROM-configurable, hex-input power-supply sequencer/supervisor with six voltage detector inputs (IN1–IN6), eight programmable outputs (PO1–PO8), and four general-purpose logic inputs (GPI1–GPI4). It supports dual-threshold undervoltage/overvoltage detection, 25µs–1600ms programmable output delays, ±1% threshold accuracy, and I²C/SMBus configuration interface. It is used in multimicroprocessor server power sequencing where precise multi-rail timing and fault logging are required.

For engineers reviewing the MAX6872ETJ+ datasheet, MAX6872ETJ+ pinout, MAX6872ETJ+ application, or MAX6872ETJ+ equivalent, this page delivers verified technical context, real-world sequencing use cases, validated alternatives, and supply-chain support for high-reliability embedded power management design.

Technical Context

The MAX6872ETJ+ integrates six independent voltage detectors-IN1 (high-voltage, +1.25V to +13.2V), IN2 (bipolar, ±1.25V to ±15.25V), and IN3–IN6 (positive, +0.5V to +5.5V)-each configurable for dual-threshold detection. Its internal 1.25V reference enables ±1% threshold accuracy across –40°C to +85°C.

All eight outputs (PO1–PO8) are individually programmable as active-high, active-low, open-drain, weak pullup, push-pull, or charge-pump (PO1–PO4 only), with timing delays set via registers from 25µs to 1600ms. A fault register logs assertion causes (e.g., undervoltage on IN3, manual reset), and two watchdog timers support GPI- or PO-triggered timeout clearing.

Key Specifications

Pinout & Package

MAX6872ETJ+ uses a 32-pin 7mm × 7mm thin QFN package (T3277-2) with exposed paddle (EP) internally connected to GND. ABP and DBP require 1µF ceramic bypass capacitors close to the pins. All voltage inputs (IN1–IN6) and logic inputs (GPI1–GPI4, MR, MARGIN) are internally pulled down or up via 10µA current sources.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply sequencing applications.

Compared with MAX6873ETJ+, the MAX6872ETJ+ provides two additional voltage inputs and three extra programmable outputs for complex multi-domain systems; compared with TPS659122ZQV, it offers superior voltage threshold resolution (10mV vs. typical 50mV), charge-pump gate drive, and dedicated fault logging - making it the preferred choice for high-precision, external-converter-based sequencing.

Availability

MAX6872ETJ+ is available at Aetrix Electronics and suitable for telecommunications central office systems, enterprise server platforms, and industrial multimicroprocessor equipment requiring stable component supply and long-term lifecycle support.

Supply support for MAX6872ETJ+ 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 computing applications.

The MAX6872ETJ+ belongs to Maxim's EEPROM-programmable power-supply sequencer family, engineered specifically for high-reliability, field-configurable sequencing in multimicroprocessor and multi-voltage systems where deterministic timing and fault visibility are critical.

FAQ

What is the maximum number of voltage rails the MAX6872ETJ+ can monitor?

The MAX6872ETJ+ monitors up to six independent voltage rails via dedicated inputs: IN1 (high-voltage), IN2 (bipolar), and IN3–IN6 (positive low-voltage). Each supports dual-threshold detection, allowing simultaneous undervoltage and overvoltage monitoring per rail - essential for comprehensive power integrity validation in servers and telecom gear. The MAX6872ETJ+ does not share inputs; all six are fully independent.

Does the MAX6872ETJ+ support charge-pump outputs, and which pins provide this function?

Yes, the MAX6872ETJ+ supports charge-pump outputs on PO1–PO4 only. These outputs swing from 0V to (VABP + 5V), enabling direct drive of n-channel high-side MOSFET gates without external level shifters. PO5–PO8 are push-pull or open-drain only and cannot generate boosted voltages. This architecture allows the MAX6872ETJ+ to sequence both high- and low-side FETs within a single device.

How is the MAX6872ETJ+ powered, and what happens if multiple supply inputs are active?

The MAX6872ETJ+ is powered via a virtual diode-OR circuit selecting among IN1 (if ≥+6.5V) or the highest valid voltage among IN3–IN6 (if ≥+2.7V). If +4V < IN1 < +6.5V and any IN3–IN6 > +2.7V, the power source is indeterminate due to LDO dropout. ABP reflects the selected supply (≈max(IN3–IN6) or +5.4V), and all outputs remain functional only when ABP exceeds the 2.5V UVLO threshold - ensuring reliable operation during brownout conditions.

Can the MAX6872ETJ+ be used in systems requiring watchdog functionality?

Yes, the MAX6872ETJ+ integrates two fully independent watchdog timers, each programmable from 6.25ms to 102.4s. Each timer can be cleared by GPI inputs, programmable outputs, or combinations thereof - supporting flexible health-check architectures. Watchdog timeout events log to the fault register and can assert any configured PO_, enabling system-level recovery actions like processor reset or power cycle initiation.

What is the role of the MARGIN input on the MAX6872ETJ+?

The MARGIN input on the MAX6872ETJ+ provides hardware-based voltage margining control during manufacturing test. When pulled low, it forces programmable outputs into a defined state (e.g., disable power rails) or holds them in their current state - allowing safe verification of system behavior under out-of-spec voltage conditions. MARGIN internally pulls up to DBP (2.55V) with 10µA and takes precedence over MR if both are asserted simultaneously.