MAX1928

低输出电压、800mA、PWM降压型DC-DC转换器


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说明

MAX1927/MAX1928 800mA降压转换器可以为需要较高效率的密集装备中的低电压微处理器提供电源。MAX1927/MAX1928使用小尺寸的外部元件,以较高的效率,产生低的输出电压(可低达750mV)。供电电压的范围是2.6V至5.5V,保证最小输出电流可到800mA。1MHz的脉宽调制(PWM)开关频率允许使用小尺寸外部元件。独特的控制机制用来减小轻负载时的纹波,而同时保持140µA的低静态电流。

MAX1927/MAX1928包括一个低导通阻抗的内部MOSFET开关和内部同步整流器来尽可能地提高效率和尽可能地减少外部元件的个数。并不需要外部二极管。其100%的占空比工作使得在800mA时仅要求维持340mV的低压差。其他特性还包括内部的软启动,电源就绪(POK)输出,及在任何负载电流下可选择性强制的PWM工作模式以降低噪声。

MAX1928具有几个预置的输出电压:1.5V (MAX1928-15)、1.8V (MAX1928-18)和2.5V (MAX1928-25)。MAX1927R具有可调节的输出电压范围,可低达0.75V。MAX1927/MAX1928都采用微型10引脚µMAX封装。
MAX1927、MAX1928:典型工作电路 MAX1927、MAX1928:典型工作电路 放大+

关键特性

  • 800mA输出电流
  • 0.75V至5V的输出电压
  • 2.6V至5.5V的输入电压范围
  • 电源就绪输出
  • 不需要肖特基二极管
  • 可选的强制PWM工作模式
  • 1MHz固定频率的PWM工作模式
  • 140µA静态电流
  • 软启动
  • 10引脚µMAX封装
  • 应用

    • 电池供电设备
    • DSP核电源
    • PDA与掌上电脑
    • WCDMA手机
    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
    MAX1927 2.65.50.755-Resistor0.8InternalYesYes11000
    UMAX/10
    $1.91 @1k
    MAX1928 1.52.5
    1.5
    1.8
    2.5
    Preset
    UMAX/10
    $1.68 @1k
    查看所有Step-Down Switching Regulators (389)
    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。


    MAX1927EVKIT: MAX1927、MAX1928评估板
    MAX1928EVKIT: MAX1927、MAX1928评估板

    技术资料

    应用笔记 3741 用于低压系统的模拟IC

    质量和环境数据

    产品可靠性报告: MAX1928.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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    类型 编号 PDF 标题
    应用笔记 3741 用于低压系统的模拟IC