MAX1921

低电压、400mA、降压型DC-DC转换器,SOT23封装


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说明

MAX1920/MAX1921降压型转换器可输出最低1.25V的电压,同时提供超过400mA的电流。这两个转换器使用独特的限流控制技术可获得高于90%的效率。这两个器件具有超低静态工作电流(50µA)、高达1.2MHz (最高)的开关频率,允许选用小尺寸、低成本的外部元件。这些特点使MAX1920/MAX1921在空间受限应用中成为线性稳压器出色的、高效替代品。

内置同步整流极大地改善了效率,无需使用传统降压型转换器中所必需的外部肖特基二极管。两个器件还包括内部数字软启动,用于限制启动过程的输入电流、降低对输入电容的要求。

MAX1920提供可调输出电压(1.25至4V)。MAX1921提供预置的输出电压(参考完整数据资料中的Selector Guide)。两个器件均采用节省空间的、6引脚SOT23封装。
MAX1920、MAX1921:典型工作电路 MAX1920、MAX1921:典型工作电路 放大+

关键特性

  • 保证400mA输出电流
  • 内置同步整流,效率>90%
  • 小巧的6引脚SOT23封装
  • 高达1.2MHz开关频率,小尺寸的外部元件
  • 50µA静态工作电流
  • 0.1µA逻辑控制关断电流
  • 2V至5.5V输入电压范围
  • 固定1.5V、1.8V、2.5V、3V和3.3V输出电压(MAX1921)
  • 可调输出电压(MAX1920)
  • ±1.5%初始精度
  • 软启动限制启动电流
  • 应用

    • 电池供电应用
    • CDMA功放电源
    • 下一代无线手机
    • PDA、掌上电脑与手持终端

    请查看具体的参数规格 Step-Down Switching Regulators (409)


    Part NumberVIN
    (V)
    VIN
    (V)
    VOUT1
    (V)
    IOUT1
    (A)
    (min)(max)(min)(max)
    MAX1920 25.51.250.4
    MAX1921 1.5

    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。

    MAX1921EVKIT: MAX1920、MAX1921评估板

    技术资料

    应用笔记 3741 用于低压系统的模拟IC
    产品可靠性报告: MAX1921.pdf 
    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。

    质量管理体系 >
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    类型 编号 标题
    应用笔记 3741 用于低压系统的模拟IC