Analog Devices Inc. MAX34461AA01+

Overview

MAX34461AA01+ from Analog Devices is a PMBus-compatible 16-channel power-supply voltage monitor and sequencer with closed-loop margining, internal/remote temperature sensing, and nonvolatile fault logging. It autonomously manages up to 16 supplies during power-up/down, enforces programmable overvoltage/undervoltage thresholds, and supports event- and time-based sequencing in network switches, base stations, and server systems.

For engineers reviewing the MAX34461AA01+ datasheet, MAX34461AA01+ pinout, MAX34461AA01+ application, or MAX34461AA01+ equivalent, this device delivers deterministic sequencing control, real-time peak/average voltage reporting, 12-bit ADC measurement (500µV LSB), autonomous fault shutdown, and SMBus-compatible configuration without host intervention.

Technical Context

The MAX34461AA01+ integrates a 12-bit, 1Msps ADC with dedicated RS0–RS15 analog inputs for voltage monitoring, dual remote-sense grounds (RSG0/RSG1), and programmable PSEN0–PSEN15 outputs supporting push-pull or open-drain operation. Its PMBus command set includes MFR_PSEN_CONFIG, MFR_SEQ_TIMESLOT, and MFR_FAULT_RESPONSE for fine-grained sequencing and fault response control.

It implements autonomous operation via on-chip flash storing default configurations and black-box fault logs (20,000 write cycles, 100-year retention), supports up to four DS75LV remote temperature sensors via dedicated MSDA/MSCL bus, and uses a 2.048V internal reference with ±1 LSB INL/DNL for precision threshold detection across –40°C to +85°C.

Key Specifications

Pinout & Package

TQFN-48 (7mm × 7mm, 0.5mm pitch) with exposed pad (EP/VSS) requiring connection to local ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX34460A and LTC2974, the MAX34461AA01+ uniquely combines 16-channel monitoring, closed-loop margining, dual remote-sense grounds, and dedicated temperature sensor bus - making it the only option for high-density telecom/server platforms requiring both scalability and thermal intelligence.

Availability

MAX34461AA01+ is available at Aetrix Electronics and suitable for network switches/routers, base stations, and server applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX34461AA01+ 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, serving industrial, automotive, communications, and healthcare markets.

The MAX34461A product line delivers highly integrated, PMBus-compliant power-supply managers for complex multi-rail systems where autonomous sequencing, fault resilience, and margining accuracy are critical - targeting next-generation infrastructure equipment.

FAQ

What is the primary function of the MAX34461AA01+ in a power-management system?

The MAX34461AA01+ serves as a fully autonomous 16-channel power-supply monitor and sequencer. It continuously measures rail voltages against programmable thresholds, executes precise power-up/down sequences, performs closed-loop margining using external DACs, logs faults to nonvolatile memory, and coordinates hardware shutdown via FAULT/ALERT signals - all without host CPU involvement once configured.

Does the MAX34461AA01+ require an external clock source for operation?

No, the MAX34461AA01+ contains an internal oscillator and operates without any external clock source. This eliminates the need for crystals or clock generators, simplifying PCB layout and reducing BOM cost. The device achieves full PMBus communication, ADC conversions, and sequencing timing using its internal timing reference.

How does the MAX34461AA01+ support thermal monitoring beyond its internal sensor?

The MAX34461AA01+ supports up to four external DS75LV digital temperature sensors via a dedicated MSDA/MSCL I²C bus, separate from the main PMBus interface. This allows concurrent thermal monitoring of critical components (e.g., CPUs, FPGAs, power stages) while avoiding bus contention and enabling independent polling intervals - a capability not available in most competing power managers.

What is the role of the RSG0 and RSG1 pins on the MAX34461AA01+?

RSG0 and RSG1 are dedicated remote-sense ground terminals: RSG0 connects to the sense ground for RS0–RS3 and RS12–RS15, while RSG1 serves RS4–RS11. This split-ground architecture minimizes noise coupling between adjacent voltage-sense channels, improving measurement accuracy in high-noise, multi-rail environments such as base station power shelves.

Can the MAX34461AA01+ perform margining on all 16 monitored rails simultaneously?

Yes, the MAX34461AA01+ supports closed-loop margining on all 16 rails via its RS0–RS15 inputs and PSEN0–PSEN15 outputs, provided external current DACs (e.g., DS4424) are connected per rail. Margining is performed by adjusting the DAC output, measuring the resulting rail voltage with the 12-bit ADC, and iteratively correcting until the target level is achieved - all under autonomous firmware control.