PMBus 6-Channel Power-Supply Manager

Power-Supply Manager Provides Unparalleled "Black Box" Failure Logging for Improving System Performance

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The MAX34440 is a complex system monitor that can manage up to six power supplies. The power-supply manager monitors the power-supply output voltage and constantly checks for user-programmable overvoltage and undervoltage thresholds. It can also margin the power-supply output voltage up or down to a user-programmable level. The margining is performed in a closed-loop arrangement whereby the device automatically adjusts a pulse-width-modulated (PWM) output and then measures the resultant output voltage. The power-supply manager can also sequence the supplies in any order at both power-up and power-down. With the addition of an external current-sense amplifier, the device can also monitor currents.
MAX34440: Block Diagram MAX34440: Block Diagram Enlarge+

Key Features

  • 6 Channels of Power-Supply Management
    • Voltage Measurement/Monitoring
      • Differential 12-Bit 1% Accurate ADC
      • Min/Max Threshold Excursion Detection
    • Supports Current Monitoring with External Current-Sense Amplifier
    • Automatic Closed-Loop Margining
    • Programmable Up and Down Sequencing
    • Power-Good Output
  • Supports Up to Eight Temperature Sensors
    • Two Remote Diode Temperature Sensors
    • Five Local Temperature Sensors
    • One Internal Temperature Sensor
    • Fault Detection on All Temp Sensors
  • PMBus-Compliant Command Interface
  • I2C/SMBus-Compatible Serial Bus with Bus Timeout Function
  • On-Board Nonvolatile Fault Logging and Default Configuration Setting
  • No External Clocking Required
  • +3.3V Supply Voltage


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

See parametric specs for Power-Supply Sequencers and Voltage Trackers (44)

Part NumberOptionInterfaceInput ChannelsVIN
Oper. Temp.
maxSee Notes
63.3-40 to +85
$3.18 @1k

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.
Product Reliability Reports: MAX34440.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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