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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.
關(guān)鍵特性
- 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
- Supports 3-Wire and 4-Wire Fans
- Automatic Closed-Loop Fan-Speed Control
- Support for Dual Tachometer Fans
- Fan-Fault Detection
- 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
應(yīng)用/使用
基站
工業(yè)控制
網(wǎng)絡(luò)交換機(jī)/路由器
服務(wù)器
智能卡網(wǎng)絡(luò)系統(tǒng)
Typical Operating Circuit
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- [電源技術(shù)] Maxim推出高度集成的電源管理(PMIC)MAX8819A 2009-01-05
- [電源技術(shù)] 參數(shù)測量單元(PMU)的布線指南 2009-04-24
- [電源技術(shù)] 新發(fā)展的電池充電器-New Developments in 2009-04-30
- [電源技術(shù)] MAX9979管腳電子IC中PMU模式操作 2009-05-05
- [電源技術(shù)] 參數(shù)測量單元(PMU)的布線指南 2009-05-05
- [電源技術(shù)] Maxim推出帶有EEPROM的高度集成PMIC 2010-01-08
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