MAX34441 PMBus的5通道电源管理器和智能风扇控制

MAX34441 PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller

概述

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.

关键特性

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

应用/使用

基站
工业控制
网络交换机/路由器
服务器
智能卡网络系统

Typical Operating Circuit