MAX8640Z

微型500mA、4MHz/2MHz同步降压型DC-DC转换器

最可靠的4MHz/2MHz、降压型DC-DC转换器,能够以93%的效率提供500mA的电流,采用微型2mm x 2.1mm SC70封装,是业内尺寸最小的解决方案


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说明

MAX8640Y/MAX8640Z降压转换器经过优化,适合需要优先考虑小尺寸、高效率和低输出纹波的应用。它们采用专利的PWM控制方案,通过优化开关频率,使用小尺寸外部元件即可获得高效率,并且在所有负载条件下都保持低输出纹波。MAX8640Z的开关频率高达4MHz,从而允许使用微型的1µH电感和2.2µF输出电容。为了获得更高效率,MAX8640Y的开关频率高达2MHz,仍允许使用小尺寸的2.2µH和4.7µF元件。输出电流保证达到500mA,而静态电流仅28µA (典型)。工厂预设的输出电压为0.8V至2.5V,可以省去外部反馈元件。

内置同步整流功能大大提高了效率,并省去了常规降压型转换器中所必需的外部肖特基二极管。内部快速软启动功能可以消除浪涌电流,降低对输入电容的要求。

MAX8640Y/MAX8640Z采用纤小的6引脚SC70无铅封装(2.0mm x 2.1mm)和µDFN (1.5mm x 1.0mm)封装。两种封装均为无铅封装。
MAX8640Y、MAX8640Z:典型工作电路 MAX8640Y、MAX8640Z:典型工作电路 放大+

关键特性

  • 纤小的SC70封装和µDFN封装
  • 保证500mA输出电流
  • 4MHz或2MHz PWM开关频率
  • 微型外部元件:1µH/2.2µF或2.2µH/4.7µF
  • 28µA静态电流
  • 工厂预设输出:0.8V至2.5V
  • 初始精度:±1%
  • 在所有负载条件下具有低输出纹波
  • 负载降低至1mA时,进入超声跳跃模式
  • 超快的线路和负载瞬态响应
  • 快速软启动消除浪涌电流

应用

  • 蜂窝电话、PDA、DSC、MP3
  • I/O电源
  • 微处理器/DSP核供电
  • 空间受限的手持产品
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8640Y 2.75.50.82.5
1
1.1
1.2
1.3
1.5
1.8
2.5
Preset0.5InternalYes12000
SC70/6
UDFN/6
$2.00 @1k
MAX8640Z 1.11.8
1.1
1.2
1.3
1.5
1.8
4000
SC70/6
UDFN/6
查看所有Step-Down Switching Regulators (367)
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。


MAX8640EVKIT: MAX8640评估板

CAD Symbols and Footprints

  • MAX8640ZELT07+
  • MAX8640ZELT07+T
  • MAX8640ZELT12+
  • MAX8640ZELT12+T
  • MAX8640ZELT18+
  • MAX8640ZELT18+T
  • MAX8640ZEXT18+
  • MAX8640ZEXT18+T
  • 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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