PMBus 16-Channel V/I Monitor and 12-Channel Sequencer/Marginer

Provides Unparalleled Sequencing, Monitoring, and Fault Logging with PWM Margining

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The MAX34451 is a power-supply system manager that is capable of monitoring up to 16 different voltage rails or currents and is also capable of sequencing and margining up to 12 power supplies. The system manager monitors the power-supply output voltages and currents and constantly checks them for user programmable over and under threshold limits. If a fault is detected, the device automatically shuts down the system in an orderly fashion. The device can sequence the supplies in any order at both power-up and power-down. The device has the ability to close-loop margin the power-supply output voltages up or down to a user-programmable level. The device contains an internal temperature sensor and can support up to four external remote temperature sensors. Once configured, the device can operate autonomously without any host intervention.

MAX34451: Typical Operating Circuit MAX34451: Typical Operating Circuit Enlarge+

Key Features

  • Integration Enables Management of Multiple Power Supplies to Maximize System Performance
    • 16 Channels of Voltage or Current Monitoring
    • 12 Channels of Sequencing and Margining (8 PWM, 4 External Current DACs (1 x DS4424), and Sequencing
    • Expandable Channel Operation with Parallel Devices
    • Remote Ground Sensing Improves Measurement Accuracy
    • Programmable Up and Down Time-Based or Event-Based Sequencing
    • Dual Sequencing Loops
    • Configurable Combinatorial Logic Supporting Up to 16 GPIs and 20 GPOs
    • Automatic Closed-Loop Margining
    • No External Clocking Required
    • PMBus™ -Compliant Command Interface
  • Fast, Reliable Control and Fault Detection Improves System Reliability
    • Fast Minimum/Maximum Threshold Excursion Detection
    • Supports Up to 5 Temperature Sensors (1 Internal and 4 Remote)
    • Fault Detection on All Temperature Sensors
    • Reports Peak, Minimum, and Average Levels for a Number of Parameters
    • Programmable Alarm Outputs
    • On-Board Nonvolatile Black Box Fault Logging and Default Configuration Setting
  • I2C-/SMBus-Compatible Serial Bus with Bus Time-Out Function Simplifies Additional Temperature Sensors and DACs to the MAX34451
  • +3.0V to +3.6V Supply Voltage


  • Base Stations
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX34451EVKIT: Evaluation Kit for the MAX34451
Product Reliability Reports: MAX34451.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

Type ID Title
App Note 5656 PWM Margining with the MAX34451