Analog Devices Inc./Maxim Integrated MAX16027TP+T

Overview

MAX16027TP+T from Maxim Integrated is a triple-voltage supervisor and sequencer in a 20-pin TQFN (4mm × 4mm) package, designed for multivoltage power-up sequencing and independent monitoring of 3.3V, 2.5V, and 1.8V rails. It features open-drain outputs (up to 28V tolerant), capacitor-adjustable delay timing per channel (CDLY1–CDLY3), and a capacitor-adjustable or fixed 140ms min reset timeout (via CRESET). It is used in server power management to coordinate startup of CPU core, I/O, and memory rails.

For engineers reviewing the MAX16027TP+T datasheet, MAX16027TP+T pinout, MAX16027TP+T application, or MAX16027TP+T equivalent, key selection criteria include its triple-monitor capability with independent enable inputs (EN1–EN3), logic-selectable thresholds (9 options via TH0/TH1), ±1.5% adjustable threshold accuracy down to 0.5V, and operation across –40°C to +125°C industrial temperature range.

Technical Context

The MAX16027TP+T implements three independent voltage detector channels, each with propagation delay (20–35µs) and capacitor-adjustable timing (via CDLY1–CDLY3), enabling precise sequencing control. Its reset output asserts low if any monitored input falls below threshold, any EN_ is pulled low, or MR is asserted - and remains low for a user-defined timeout after all conditions are satisfied.

Threshold selection uses dual logic inputs (TH0/TH1) to configure fixed (3.3V/2.5V/1.8V) or adjustable (down to 0.5V) detection points, with tolerance selection (5% or 10%) set by TOL pin. All outputs are open-drain, supporting interface to external DC-DC enable/shutdown pins up to 28V.

Key Specifications

Pinout & Package

MAX16027TP+T is housed in a 20-pin TQFN (4mm × 4mm) package with exposed thermal pad (EP) internally connected to GND. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16028TP+T and TPS3808G33DBVR, the MAX16027TP+T uniquely delivers triple-rail supervision with per-channel enable, 28V-tolerant open-drain outputs, and capacitor-programmable sequencing - making it irreplaceable for complex multivoltage systems requiring flexible, robust power management.

Availability

MAX16027TP+T is available at Aetrix Electronics and suitable for server power sequencing, storage system supervision, and industrial embedded control requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX16027TP+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 communication applications.

The MAX16025–MAX16030 family was developed specifically for multivoltage system supervision and sequencing in space-constrained, thermally demanding environments such as servers, storage, and networking infrastructure.

FAQ

What is the maximum input voltage the MAX16027TP+T can monitor on IN1–IN3?

The MAX16027TP+T does not impose a hard upper limit on monitored input voltage - IN1–IN3 tolerate up to (VCC + 0.3V) per absolute maximum ratings. Since VCC supports up to 28V, the inputs can safely monitor rails up to ~28.3V when VCC = 28V. However, threshold selection (fixed or adjustable) determines functional detection range - e.g., 3.3V fixed threshold or 0.5V–28V via resistive divider. The MAX16027TP+T itself does not regulate or clamp these inputs.

Can the MAX16027TP+T be used with a 1.2V supply rail as VCC?

No - the MAX16027TP+T requires VCC between 2.2V and 28V per datasheet specifications. At VCC < 2.2V, the device enters undervoltage lockout (UVLO), forcing all outputs low. While outputs remain functionally valid down to VCC = 1.2V *after* startup, the part will not power up or operate correctly if VCC starts below 2.2V. For 1.2V-system applications, an external LDO or charge pump must generate ≥2.2V to power the MAX16027TP+T.

How do I configure the MAX16027TP+T to monitor 1.2V, 1.8V, and 3.3V simultaneously?

Set TH0 = GND and TH1 = VCC (per Table 2) to select the "High/Low" threshold combination: IN1 = 3.3V, IN2 = 1.2V, IN3 = 1.8V. Connect TOL to GND for 5% tolerance (3.135V/1.14V/1.71V thresholds) or to VCC for 10% (2.97V/1.08V/1.62V). No external resistors are needed - all thresholds are internally generated. Verify actual trip points using the Electrical Characteristics table for temperature drift and accuracy.

Does the MAX16027TP+T support daisy-chained sequencing like some other Maxim supervisors?

Yes - the MAX16027TP+T supports daisy-chained sequencing by connecting OUT1 to EN2 and OUT2 to EN3. This creates a cascaded startup: IN1 must exceed threshold → OUT1 goes high → enables IN2 monitoring → IN2 OK → OUT2 goes high → enables IN3. This method enforces strict monotonic sequencing without external timing components. The datasheet confirms this topology in Figure 4 and "Detailed Description" section.

What is the minimum recommended capacitor value for CRESET to achieve reliable reset timeout?

For reliable reset timeout operation, CRESET capacitor should be ≥1nF. Smaller values increase sensitivity to leakage and noise, risking premature timeout. Using the formula tRP = (0.5V / 0.5µA) × CCRESET, a 1nF cap yields ~1ms timeout; 100nF gives ~100ms; 1µF gives ~1s. Datasheet Figure 6 shows stable behavior down to ~100nF. Always use low-leakage ceramic (X7R/C0G) and minimize PCB trace length to CRESET to avoid timing errors in the MAX16027TP+T.