MAX8655

高度集成的25A、宽输入范围、内置MOSFET的降压型调节器

首款降压型DC-DC转换器,输入范围为+4.5V至+28V
可编程开关频率高达1.2MHz


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说明

MAX8655同步PWM buck调节器工作于4.5V至25V输入电压范围,可产生0.7V至5.5V可调输出电压,提供高达25A的负载电流。内置功率MOSFET支持小外型设计,易于布线并降低了EMI。减小电路板寄生电感,可确保在高频工作时效率最高。

MAX8655采用峰值电流控制架构,可调节固定开关频率(200kHz至1MHz),支持外同步。利用电感的直流电阻提供MAX8655的限流功能,有助于提高效率;也可以使用外部检流电阻提高检测精度。折返式限流功能降低了严重过载或短路情况下的功耗。提供基准输入,作为高精度外部基准输入或用于DDR跟踪。

单调启动能够能够保证启动时安全进入预偏置输出,而传统的降压调节器在软启动期间会向输出电容放电,并在输出端产生负压,有可能损坏负载。

180°反相同步输出能够实现与另一个MAX8655的同步工作。

使能输入控制通/断操作,可灵活实现输出排序功能。输出电压检测电路实现可调节的过压保护,保护电压与反馈网络无关,进一步提高了输出过压保护的安全性。

综上所述,MAX8655为有经验的用户提供足够的灵活性,对于没有电源设计经验的工程师来说同样简单易用。

关于PowerMind™的更多信息
MAX8655:典型工作电路 MAX8655:典型工作电路 放大+

关键特性

  • 25A输出电流
  • 内置功率MOSFET
  • 4.5V至25V电源供电
  • 在工作温度范围内保证1%的FB电压精度
  • 可调输出电压低至0.7V
  • 200kHz至1MHz可调开关频率或外同步
  • 采用多相设计,提供精确的电流分配
  • 180°反相同步输出
  • 可调节过流门限
  • 可调节斜率补偿
  • 可选择限流模式:闭锁或自动重启
  • 启动进入预偏置输出时,输出电压单调上升
  • 输出可源出、吸入电流,适合DDR应用
  • 使能输入
  • 电源就绪(POK)输出
  • 可调节软启动
  • 独立的可调节过压保护

应用

  • IBA电源
  • 网络
  • 非隔离型DC-DC电源模块
  • 笔记本电脑
  • 负载点电源
  • 服务器与工作站
  • 电信电源
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8655 4.5250.75.5Resistor25InternalYesYes11000EE-Sim
TQFN/56
TQFN HYBRID/56
$6.47 @1k
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。


MAX8655EVKIT: MAX8655和MAX8688评估板

工具和模型

  • EE-Sim: MAX8655 设计和仿真
  • MAX8655 SIMPLIS Schematic
  • CAD Symbols and Footprints

  • MAX8655ETN+
  • MAX8655ETN+T
  • MAX8655ETN+W
  • MAX8655ETN/GG8
  • 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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