MAX1876

双路、180°异相、PWM降压型控制器,带有POR


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说明

MAX1875/MAX1876双路、同步降压控制器在输入电压范围为4.75V至23V时产生两路输出。每路输出可在1V至18V范围内调节,并且支持10A或者更高的负载。180°错相同步工作方式减小了输入电压纹波和总RMS的纹波电流有效值。

其开关频率可以通过一个外部电阻在100kHz至600kHz之间调节,或者使控制器同步于另一个做为外部时钟的MAX1875/MAX1876或一个系统时钟。MAX1875/MAX1876可以为从控制器的同步按设置输出一个同相或是90°错相的时钟信号。这就使得两个控制器可以90°相移交替工作于双相位或四相位系统。这两种器件还具备于软启动和软停止特性。

MAX1875/MAX1876通过利用低端MOSFET通态电阻做为检流元件省去了对检流电阻的需求。不需要外加检流电阻就可保护变换器的元件在输出过载期间或者发生短路时不受损害。可调的回折式电流限制可减少在短路情况下的电源损耗。在两路输出都达到调整范围时,MAX1876的电源上电复位输出将会给系统发出信号。

MAX1875/MAX1876采用24引脚的QSOP封装,可提供评估板以加快设计。
MAX1875、MAX1876:典型工作电路 MAX1875、MAX1876:典型工作电路 放大+

关键特性

  • 两路独立输出电压
  • 180°错相操作
  • 90°错相操作(使用两个MAX1875/MAX1876)
  • 回折式电流限制
  • 4.75V至23V的输入供电范围
  • 0至18V输出电压范围(最多10A的输出电流)
  • 效率大于90%
  • 固定频率的脉宽调制(PWM)工作
  • 在100kHz至600kHz之间可调的开关频率
  • 外部SYNC输入
  • 输出主同步/从同步的时钟
  • 软启动和软停止
  • 140ms最小延迟的/RST输出(MAX1876)
  • 低耗回折式电流限制(没有检流电阻)
  • 应用

    • 宽带路由器
    • DSP、ASIC、FPGA电源
    • 网络电源
    • 服务器
    • 机顶盒
    • 电信电源

    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
    申请可靠性报告: MAX1876 
    型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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