PMBus 16-Channel Monitor/Sequencer with Differential Inputs and Margining DACs

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

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The MAX34462 is a system monitor that can manage up to 16 power supplies. The power-supply manager monitors the power-supply output voltages and constantly checks for user-programmable overvoltage and undervoltage thresholds. 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 contains 16 independent voltages DACs, which the device uses 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.
MAX34462: Typical Operating Circuit MAX34462: Typical Operating Circuit Enlarge+

Key Features

  • 16 Channels of Power-Supply Management
  • Power-Supply Voltage or Current Measurement and Monitoring
  • Fast Minimum/Maximum Threshold Excursion Detection
  • Differential Input Sensing Improves Measurement Accuracy
  • 16 Independent Voltage DACs for Power-Supply Margining
  • Automatic Closed-Loop Margining
  • Programmable Up and Down Sequencing
  • Up to Four Independent Sequencing Loops
  • 5V Tolerant Power-Supply Output Enables
  • Internal Temperature Sensor
  • Reports Peak and Average Levels for a Number of Parameters
  • PMBus-Compliant Command Interface
  • I2C/SMBus-Compatible Serial Bus with Bus Timeout Function
  • On-Board Nonvolatile Black Box Fault Logging and Default Configuration Setting
  • Expandable Channel Operation with Parallel Devices
  • Sequencing Can be Timing Synchronized Across Multiple Devices
  • Configurable Combinatorial Logic Supporting Up to 16 GPIs and 36 GPOs
  • No External Clocking Required
  • +3.0 to +3.6V Supply Voltage


  • Base Stations
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems
Product Reliability Reports: MAX34462.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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