MAX1947

低输入/输出电压、升压型DC-DC转换器,带有/RESET

尺寸最小的1.8V输出升压转换器,提供True Shutdown,用于1节/2节碱性电池供电的手持产品


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说明

MAX1947是一款集成的高效、升压型DC-DC转换器,用来调节1.8V至3.3V的输出电压,为µP/DSP内核、存储器以及1节与2节碱性/NiMH/NiCd电池供电系统的I/O供电。该器件具有内部800mA开关与同步整流器,可以实现最高94%的效率,并省去了外部肖特基二极管。

高频开关(最高2MHz)减小了纹波,并允许使用小的外部元件,轻载时的自动跳脉冲功能使电源电流降至70µA,有效延长了电池寿命。Maxim的True Shutdown™专利技术能够将电源电流减小到2µA,并将输出完全放电至地。转换器提供1.8V、2.5V、3.0V和3.3V固定输出电压,不需要反馈或补偿网络。75ms的/RESET输出标志提供上电复位(POR)与欠压检测。MAX1947采用节省空间的8引脚TDFN封装。
MAX1947:典型工作电路 MAX1947:典型工作电路 放大+

关键特性

  • 低输入(0.7V)电压和低输出(1.8V)电压
  • 内部同步整流器
  • 94%的高效率
  • 固定输出电压:1.8V、2.5V、3V和3.3V
  • 最高2MHz开关频率,允许使用小尺寸外部元件,且输出纹波极小
  • 轻载时的自动跳脉冲功能有效延长电池寿命
  • 70µA (典型值)低电源电流(在OUT引脚测得)
  • 2µA逻辑控制关断模式
  • True Shutdown将输出完全放电至地
  • 只需使用小的陶瓷电容
  • 75ms /RESET输出标志

应用

  • 无绳电话
  • 数码相机
  • MP3播放器、寻呼机和CD播放器
  • 其它电池供电系统
  • PDA与数字助理
  • 便携式医疗设备
  • 无线鼠标/键盘
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypePower Good SignalSynchronous SwitchingICC
(mA)
DC-DC OutputsPackage/PinsBudgetary
Price
minmaxminmaxtypSee Notes
MAX1947 0.73.61.83.3
1.8
1.9
2.5
2.7
3
3.3
0.25PresetInternalYesYes0.071
TDFN/8
$1.49 @1k
查看所有Step-Up Switching Regulators (95)
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。


MAX1947EVKIT: MAX1947评估板
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。

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