Analog Devices Inc./Maxim Integrated MAX16025TE+T

Overview

MAX16025TE+T from Maxim Integrated is a dual-voltage supervisor and sequencer in a 16-pin TQFN (4mm × 4mm) package, designed for precise power-rail monitoring and controlled power-up sequencing in multivoltage systems. It monitors two independent input voltages (IN1/IN2), provides open-drain outputs (OUT1/OUT2), features capacitor-adjustable delay timing via CDLY1/CDLY2, supports 5%/10% threshold tolerance selection via TOL pin, and delivers an open-drain active-low RESET output with fixed (140ms min) or capacitor-adjustable timeout.

For engineers reviewing the MAX16025TE+T datasheet, MAX16025TE+T pinout, MAX16025TE+T application, or MAX16025TE+T equivalent, this device is selected for high-accuracy, flexible sequencing in server power supplies, storage controllers, and industrial embedded systems where dual-rail validation and daisy-chainable timing control are required.

Technical Context

The MAX16025TE+T implements four independent comparator-based voltage detectors per monitored rail, each with logic-selectable thresholds (nine options via TH0/TH1), propagation-delay–based response on undervoltage events, and capacitor-controlled assertion delays on overvoltage transitions. Its reset generation logic deasserts only after both IN1 and IN2 exceed their respective thresholds, all enable inputs (EN1/EN2) are high, and the reset timeout expires.

Each detector includes an active-high enable input (EN1/EN2), allowing independent shutdown of OUT1/OUT2 regardless of input voltage state. The open-drain outputs support pullup to up to 28V, enabling direct interface with enable/shutdown pins of DC-DC regulators operating at higher voltages than VCC.

Key Specifications

Pinout & Package

Package: 16-pin TQFN (4mm × 4mm, 0.8mm height), exposed pad internally connected to GND. RoHS-compliant, lead-free (denoted by "+" in part number).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX16026TE+T, the MAX16025TE+T provides essential 28V-tolerant open-drain outputs for regulator enable control; compared with TPS3808G18DBVR, it delivers coordinated dual-rail supervision with programmable timing-neither alternative replicates its full sequencing and interface flexibility.

Availability

MAX16025TE+T is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC power management, and storage controller voltage validation requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for MAX16025TE+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 and mixed-signal ICs for power management, sensing, and connectivity in demanding industrial, automotive, and communications applications.

The MAX16025–MAX16030 family was engineered to solve multivoltage sequencing challenges in space-constrained, high-reliability systems-delivering configurable thresholds, capacitor-timed delays, and robust reset coordination without firmware dependency.

FAQ

What is the maximum voltage the MAX16025TE+T open-drain outputs can tolerate?

The MAX16025TE+T open-drain outputs (OUT1, OUT2, and RESET) are rated to 30V absolute maximum and support external pullup voltages up to 28V. This allows direct interfacing with enable/shutdown inputs of DC-DC regulators operating at higher voltages than the MAX16025TE+T's own VCC supply, eliminating level-shifter components in multirail systems.

How does the MAX16025TE+T determine which voltage thresholds apply to IN1 and IN2?

The MAX16025TE+T uses the logic states of TH0 and TH1 pins (plus TOL) to select from nine predefined threshold combinations. For example, TH1 = low and TH0 = low configures both IN1 and IN2 for 3.3V and 2.5V nominal thresholds respectively. Table 2 in the datasheet defines all nine mappings - the same configuration applies identically to both monitored inputs.

Can the MAX16025TE+T be used for single-rail monitoring only?

Yes - the MAX16025TE+T supports single-rail operation by connecting EN2 to VCC (enabling IN2 monitoring) or to GND (disabling OUT2). Unused inputs (IN2, EN2, CDLY2, TH1, TH0, TOL) must be tied to valid logic levels per datasheet guidance; leaving them floating violates specification and risks erratic behavior.

What is the minimum reset timeout period for the MAX16025TE+T, and how is it set?

The MAX16025TE+T provides a fixed minimum reset timeout of 140ms when CRESET is connected to VCC. To achieve shorter or longer timeouts, connect a capacitor from CRESET to GND; timeout is calculated as t_RP = (0.5V / 500nA) × C_CRESET + 35µs. Leaving CRESET open results in propagation-delay–only reset assertion (≈35µs).

Does the MAX16025TE+T require external resistors to monitor nonstandard voltages like 1.05V?

Yes - for voltages not covered by the nine logic-selectable thresholds (e.g., 1.05V), use a resistive divider network on IN1 or IN2. The MAX16025TE+T's adjustable threshold is ~0.5V (TOL = GND) or ~0.472V (TOL = VCC); select R1/R2 such that V_IN × R2/(R1+R2) equals that reference. Input leakage (≤100nA) introduces error, so lower resistor values improve accuracy but increase power draw.