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

 

Part Number	Replacement	Explanation

Description

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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.

MAX34441: Typical Operating Circuit Enlarge+

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