Analog Devices Inc. ADM1184ARMZ

Overview

ADM1184ARMZ from Analog Devices is a quad voltage monitor IC with 0.8% threshold accuracy, designed for power supply supervision in multi-rail systems. It monitors four independent voltage rails using internal 0.6 V references, delivers three open-drain enable outputs (OUT1–OUT3) and one common open-drain power-good output (PWRGD), and operates from 2.7 V to 5.5 V on VCC - used in PC/server power sequencing and telecom system health monitoring.

For engineers reviewing the ADM1184ARMZ datasheet, ADM1184ARMZ pinout, ADM1184ARMZ application, or ADM1184ARMZ equivalent, key selection criteria include its 190 ms PWRGD assertion delay, ±20 nA VINx input leakage, 30 µs propagation delay, 10-lead MSOP package, and compatibility with resistor-divider-based trip-point programming for diverse rail voltages.

Technical Context

The ADM1184ARMZ integrates four independent precision comparators, each referenced to a stable 0.6 V internal reference with worst-case 0.8% accuracy over −40°C to +85°C. Each VINx input accepts externally scaled rail voltages via resistor dividers, enabling flexible trip-point configuration across 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5 V domains.

Its output architecture features three dedicated enable outputs (OUT1–OUT3), each tied to its corresponding VINx input, plus a shared PWRGD output that asserts only after all four inputs exceed their thresholds and sustains a 190 ms (typical) delay - deasserting immediately upon any single rail failure. All outputs are open-drain and support active-high logic with VCC ≥ 1 V guaranteeing valid levels.

Key Specifications

Pinout & Package

ADM1184ARMZ is housed in a 10-lead Mini Small Outline Package (MSOP), JEDEC MO-187-BA compliant, with 0.5 mm lead pitch and exposed pad not present. Thermal resistance θ_JA = 137.5°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitoring applications.

Compared with TPS3307-33D and MAX6816CUA+, the ADM1184ARMZ provides superior threshold accuracy (0.8% vs. ≥1.25%), full four-channel independence, and integrated 190 ms delay - making it optimal for complex, tightly regulated multi-rail systems where sequencing reliability and margin tolerance are critical.

Availability

ADM1184ARMZ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card supervision, industrial PLC backplane monitoring, embedded microprocessor reset control, and FPGA power management requiring stable component supply and long-term lifecycle assurance.

Supply support for ADM1184ARMZ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The ADM1184ARMZ belongs to Analog Devices' precision power monitoring product line, engineered specifically for robust, low-power, multi-rail voltage supervision in mission-critical computing and infrastructure equipment.

FAQ

What is the operating voltage range for the ADM1184ARMZ?

The ADM1184ARMZ operates from 2.7 V to 5.5 V on its VCC pin, with guaranteed valid output behavior down to 1 V. This wide supply range allows direct connection to common system rails like 3.3 V or 5 V while maintaining functionality during brownout conditions - a key design feature of the ADM1184ARMZ for resilient power management.

How does the ADM1184ARMZ achieve 0.8% voltage threshold accuracy?

The ADM1184ARMZ achieves 0.8% threshold accuracy through a trimmed internal 0.6 V bandgap reference and matched comparator input stages, specified over −40°C to +85°C. Its worst-case trip point is 0.5952 V to 0.6048 V, enabling precise detection of rail deviations - a specification rigorously validated in the ADM1184ARMZ datasheet and confirmed across production lots.

Can the ADM1184ARMZ monitor a 1.2 V rail directly?

No - the ADM1184ARMZ cannot monitor a 1.2 V rail directly because its internal comparators reference 0.6 V. Instead, a resistor divider scales the 1.2 V rail to 0.6 V at the VINx pin (e.g., 1:1 ratio). This method is explicitly supported in the ADM1184ARMZ functional description and enables accurate monitoring of any rail ≥0.6 V with proper scaling.

What happens to PWRGD if only VIN4 drops below threshold?

If only VIN4 drops below its 0.6 V threshold, the ADM1184ARMZ deasserts PWRGD immediately while keeping OUT1, OUT2, and OUT3 asserted - since those outputs depend solely on VIN1–VIN3. This behavior is defined in the ADM1184ARMZ truth table and timing diagrams, allowing differentiated fault reporting for non-critical auxiliary rails.

Is the ADM1184ARMZ RoHS compliant and what is its package type?

Yes, the ADM1184ARMZ is RoHS compliant (denoted by "Z" suffix) and packaged in a 10-lead Mini Small Outline Package (MSOP), JEDEC MO-187-BA compliant, with 0.5 mm lead pitch. This compact, surface-mount package supports high-density PCB layouts and is verified in the ADM1184ARMZ ordering guide and outline drawings.