Analog Devices Inc./Maxim Integrated MAX34451ETNA1+T

Overview

MAX34451ETNA1+T from Maxim Integrated is a PMBus-compliant 16-channel voltage/current monitor and 12-channel power-supply sequencer/marginer in a 56-pin TQFN-EP package. It performs real-time closed-loop margining of up to 12 rails using 8 integrated PWM outputs and 4 external current DACs (e.g., DS4424), monitors 16 analog inputs with 12-bit ADC resolution and ±1 LSB INL, supports 5 temperature sensors (1 internal + 4 remote), and operates autonomously after configuration for server and telecom power management.

For engineers reviewing the MAX34451ETNA1+T datasheet, MAX34451ETNA1+T pinout, MAX34451ETNA1+T application, or MAX34451ETNA1+T equivalent, this page delivers verified technical context, exact pin functions, confirmed sequencing/margining capabilities, thermal monitoring architecture, and validated alternative options - all grounded in the official MAX34451 datasheet Rev 2 (5/2015).

Technical Context

The MAX34451ETNA1+T integrates a 12-bit, 1Msps ADC with programmable conversion time (1000ns–8µs), dual sequencing loops, and configurable combinatorial logic supporting 16 GPIs and 20 GPOs. Its PMBus interface enables full configuration and telemetry, while the dedicated master I²C bus (MSCL/MSDA) manages external DS75LV temperature sensors and DS4424 DACs.

It implements hardware-based fault response with on-board nonvolatile black-box logging, automatic shutdown on threshold violation, and autonomous operation post-configuration. The device uses internal 2.048V reference with ±500µV LSB resolution and supports event-based or time-based sequencing with user-programmable up/down timing.

Key Specifications

Pinout & Package

Package: 56-pin TQFN-EP (7mm × 7mm, 0.5mm pitch) with exposed pad (EP/VSS) requiring solder connection to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX34452ETNA1+T, the MAX34451ETNA1+T offers identical core functionality at lower GPIO count and cost; versus LM25066IIPM/NOPB, it delivers 16× more monitoring channels, full sequencing, and closed-loop margining - making it the only viable option for complex multi-rail systems.

Availability

MAX34451ETNA1+T is available at Aetrix Electronics and suitable for network switches/routers, telecom base stations, and server power management requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX34451ETNA1+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, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.

The MAX34451 belongs to Maxim's Power System Management product line, engineered specifically for autonomous, high-channel-count power-rail monitoring and sequencing in datacenter and telecom infrastructure.

FAQ

What is the primary function of the MAX34451ETNA1+T in a power system?

The MAX34451ETNA1+T serves as a fully autonomous PMBus-compliant power-supply system manager. It monitors up to 16 voltage or current rails, sequences and margining up to 12 power supplies using integrated PWM outputs or external DACs, and provides hardware-based fault detection and response - all without host CPU intervention after initial configuration. This makes the MAX34451ETNA1+T ideal for high-reliability server and telecom applications.

Does the MAX34451ETNA1+T require an external clock source?

No, the MAX34451ETNA1+T does not require an external clock source. It contains an internal oscillator that drives its 12-bit ADC and sequencing engine. The datasheet explicitly states "No External Clocking Required" as a key feature, and electrical characteristics confirm stable operation across -40°C to +85°C without external timing components. This simplifies design and improves system robustness for the MAX34451ETNA1+T.

How many temperature sensors can the MAX34451ETNA1+T support, and what types?

The MAX34451ETNA1+T supports five temperature sensors: one integrated die-temperature sensor (±2°C accuracy) and four external DS75LV digital temperature sensors connected via its dedicated master SMBus interface (MSCL/MSDA pins). All five sensors are monitored independently, with fault detection, peak/minimum/average reporting, and alarm generation - critical for thermal management in the MAX34451ETNA1+T's target applications.

Can the MAX34451ETNA1+T perform closed-loop margining without external components?

Yes - for 8 of its 12 margining channels, the MAX34451ETNA1+T uses integrated PWM outputs (PWM0–PWM7) to directly drive external RC filters or optocouplers for closed-loop voltage margining. For the remaining 4 channels (8–11), it relies on external DS4424 current DACs controlled via the master SMBus. So while full 12-channel margining requires external DACs for channels 8–11, the MAX34451ETNA1+T provides complete closed-loop capability out-of-the-box for 8 rails.

What package type and pin count does the MAX34451ETNA1+T use?

The MAX34451ETNA1+T uses a 56-pin TQFN-EP (Thin Quad Flat No-lead with Exposed Pad) package measuring 7mm × 7mm with 0.5mm pitch. The exposed pad (EP/VSS) must be soldered to the PCB ground plane for thermal dissipation and signal integrity. This package is confirmed in the Ordering Information table and Pin Configuration diagram of the MAX34451 datasheet Rev 2.