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MAX34441：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

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

MAX34441: Typical Operating Circuit Applications/Uses Base Stations Industrial Controls Network Switches/Routers Servers Smart Grid Network Systems

DataSheet

Parametrics

Design kits & evaluation modules

• MAX34441EVKIT

Quality and Environmental Data

• MAX34441.pdf

Related Products

• MAX34440：PMBus 6-Channel Power-Supply Manager

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