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MaximMAX34441PMBus五路电源管理方案关键词：电源管理,DC/DC转换器,PWMMaxim公司的MAX34441是PMBus五路电源管理器和智能风扇控制器，电源管理器能监视电源输出电压，用户编程的过压和欠压阈值。MAX34441具有PMBus兼容的命令接口，I2C/SMBus兼容的串行接口，不需要外接时钟，3.3V电源，主要用在网络交换/路由器，基站，服务器，智能电网系统和工业控制。本文介绍了MAX34441主要特性，方框图以及多个器件连接方框图和典型应用电路。PMBus5-ChannelPower-SupplyManagerandIntelligentFanControllerTheMAX34441isacomplexsystemmonitorthatcanmanageuptofivepowersuppliesandafan.Thepower-supplymanagermonitorsthepower-supplyoutputvoltageandconstantlychecksforuser-programmableovervoltageandundervoltagethresholds.Itcanalsomarginthepower-supplyoutputvoltageupordowntoauser-programmablelevel.Themarginingisperformedinaclosed-looparrangementwherebythedeviceautomaticallyadjustsapulse-width-modulated(PWM)outputandthenmeasurestheresultantoutputvoltage.Thepower-supplymanagercanalsosequencethesuppliesinanyorderatbothpower-upandpower-down.Withtheadditionofanexternalcurrent-senseamplifier,thedevicecanalsomonitorcurrents.Thedevicealsocontainsclosed-loopfan-speedcontrol.Basedonuser-programmablesettingsforfan-controlPWMdutycyclesorRPMspeedsatparticulartemperaturebreakpoints,thedeviceautomaticallyadjuststhefanspeedinamannertoreduceaudiblenoiseandpowerconsumption.MAX34441主要特性：5ChannelsofPower-SupplyManagementVoltageMeasurement/MonitoringDifferential12-Bit1%AccurateADCMin/MaxThresholdExcursionDetectionSupportsCurrentMonitoringwithExternalCurrent-SenseAmplifierAutomaticClosed-LoopMarginingProgrammableUpandDownSequencingPower-GoodOutput1ChannelofFanControlSupports3-Wireand4-WireFansAutomaticClosed-LoopFan-SpeedControlSupportforDualTachometerFansFan-FaultDetectionSupportsUptoSixTemperatureSensorsExternalThermalDiodeInterfacewithAutomaticSeriesResistanceCancellationOneInternalTemperatureSensorSupportforUptoFourAdditionalI2CDigitalTempSensorICsFaultDetectiononAllTempSensorsPMBus™-CompliantCommandInterfaceI2C/SMBus™-CompatibleSerialBuswithBusTimeoutFunctionOn-BoardNonvolatileFaultLoggingandDefaultConfigurationSettingNoExternalClockingRequired+3.3VSupplyVoltageMAX34441应用：NetworkSwitches/RoutersBaseStationsServersSmartGridNetworkSystemsAO-Electronics傲壹电子官网：中文网：。MAX34441方框图图2。MAX34441多个器件连接方框图图3。MAX34441典型工作电路图