MAX1904

500kHz、多输出、低噪声、电源控制器,用于笔记本电脑


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说明

MAX1901/MAX1902/MAX1904是buck结构、降压型、开关模式、电源控制器,可为电池供电系统提供逻辑电路供电电压。这些高性能的双/三路输出器件具有板上顺序上电控制、带延时的电源就绪指示、数字软启动、次级线圈控制、低压差电路、内部频率补偿网络和自动自举等功能。

利用同步整流和Maxim专有的Idle Mode™控制技术,可提供高达97%的效率。器件在1000:1负载电流范围内效率高于80%,在系统挂起或待机模式下可有效延长电池的寿命。优异的动态响应能够在5个时钟周期内校准输出负载瞬变。1A大电流板上栅级驱动器保证外部N沟道MOSFET的高速切换。

这些器件采用逻辑控制、可同步、固定频率的脉宽调制(PWM)工作模式。在灵敏的移动通信和笔输入设备中能够有效降低噪声和RF干扰。触发/SKIP引脚启动固定频率模式,能够在任何负载条件下获得最低噪声。

MAX1901/MAX1902/MAX1904包含两个PWM调节器,可调电压范围为2.5V至5.5V,另有5.0V和3.3V固定输出模式。这些器件都包含次级反馈调节功能,MAX1902包含一个12V/120mA线性稳压器。MAX1901/MAX1904包含一个次级反馈输入引脚(SECFB)和一个控制引脚(STEER)用于选择接收次级反馈信号的PWM (3.3V或5V)。SECFB提供了一种通过外部分压电阻调整次级线圈电压的方法,可用来产生固定12V以外的其他电压。

MAX1901/MAX1902具有内部输出过压保护和欠压保护特性。
MAX1901、MAX1902、MAX1904:功能框图 MAX1901、MAX1902、MAX1904:功能框图 放大+

关键特性

  • 效率高达97%
  • 4.2V至30V输入电压范围
  • 2.5V至5.5V双可调电压输出
  • 可选的3.3V和5V固定输出或可调输出(Dual Mode™)
  • 12V线性稳压器
  • 可调的次级线圈反馈(MAX1901/MAX1904)
  • 5V/50mA线性稳压输出
  • 精确的2.5V参考电压输出
  • 上电顺序可编程
  • 电源就绪(/RESET)输出
  • 输出过压保护(MAX1901/MAX1902)
  • 输出欠压保护(MAX1901/MAX1902)
  • 333kHz/500kHz低噪声、固定频率工作
  • 98%占空比提供低压差
  • 2.5mW典型静态功耗(12V输入,SMPS都工作)
  • 4µA典型关断电流
  • 应用

    • 台式CPU本地DC-DC转换器
    • 笔记本电脑和亚笔记本电脑
    • PDA与移动通信
    Part NumberVIN
    (V)
    VIN
    (V)
    VOUT1
    (V)
    VOUT1
    (V)
    Preset VOUT
    (V)
    Output Adjust. MethodIOUT1
    (A)
    Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
    (kHz)
    Package/PinsBudgetary
    Price
    minmaxminmaxSee Notes
    MAX1901 4.2302.55.5
    3.3
    5
    Resistor5ExternalYesYes2330
    SSOP/28
    TQFN/32
    $6.51 @1k
    MAX1902 
    SSOP/28
    $6.61 @1k
    MAX1904 
    SSOP/28
    TQFN/32
    $6.59 @1k
    查看所有Step-Down Switching Regulators (388)
    Pricing Notes:
    价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

    技术资料

    应用笔记 1845 Choosing the Right DC-DC Converter for Automotive Applications

    质量和环境数据

    产品可靠性报告: MAX1904.pdf 
    无铅封装的锡(Sn)晶须报告
    型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    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。

    质量管理体系 >
    环境管理体系 >

     
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