MAX34440 PMBus 6-Channel Power-Supply Manager

Product Details

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.


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

Features and Benefits

  • 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