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PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller

Power Supply/Thermal Manager Provides Unparalleled “Black Box” Failure Logging and Energy Efficient Fan Control

Product Details

The MAX34441 is a complex system monitor that can manage up to five power supplies and a fan. 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.

The device also contains closed-loop fan-speed control. Based on user-programmable settings for fan-control PWM duty cycles or RPM speeds at particular temperature breakpoints, the device automatically adjusts the fan speed in a manner to reduce audible noise and power consumption.

Key Features

  • 5 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
  • 1 Channel of Fan Control
    • Supports 3-Wire and 4-Wire Fans
    • Automatic Closed-Loop Fan-Speed Control
    • Support for Dual Tachometer Fans
    • Fan-Fault Detection
  • Supports Up to Six Temperature Sensors
    • External Thermal Diode Interface with Automatic Series Resistance Cancellation
    • One Internal Temperature Sensor
    • Support for Up to Four Additional I²C Digital Temp Sensor ICs
    • 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

Applications/Uses

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

Simplified Block Diagram

MAX34441: Typical Operating Circuit MAX34441: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX34441 evaluation kit (EV kit) simplifies evaluation of the MAX34441 and MAX34440 PMBus™ power-supply managers. The MAX34440 controls six power supplies, whereas the MAX34441 controls five power supplies plus a fan. The MAX34441 EV kit ships with the MAX34441 installed and a fan. The fully assembled and tested EV kit includes five power supplies that can be sequenced, monitored, and margined by the MAX34441 or MAX34440 and also includes a fan for closed-loop fan control using the MAX34441.

View Details

Features

  • Easy Evaluation of the MAX34441 or MAX34440
  • Fully Assembled and Tested
  • USB-Controlled GUI
  • 5 Channels of Power Supply
  • One Fan Control Channel

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Support & Training

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Parameters

Key Features

  • 5 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
  • 1 Channel of Fan Control
    • Supports 3-Wire and 4-Wire Fans
    • Automatic Closed-Loop Fan-Speed Control
    • Support for Dual Tachometer Fans
    • Fan-Fault Detection
  • Supports Up to Six Temperature Sensors
    • External Thermal Diode Interface with Automatic Series Resistance Cancellation
    • One Internal Temperature Sensor
    • Support for Up to Four Additional I²C Digital Temp Sensor ICs
    • 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

Applications/Uses

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

Description

The MAX34441 is a complex system monitor that can manage up to five power supplies and a fan. 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.

The device also contains closed-loop fan-speed control. Based on user-programmable settings for fan-control PWM duty cycles or RPM speeds at particular temperature breakpoints, the device automatically adjusts the fan speed in a manner to reduce audible noise and power consumption.

Simplified Block Diagram

MAX34441: Typical Operating Circuit MAX34441: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal