MAX8553

4.5V至28V输入、同步PWM buck控制器,适合DDR端接和负载点应用

4.5V至28V输入、同步PWM降压控制器,适合DDR端接和负载点应用,提供快速瞬态响应


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说明

MAX8553为4.5V至28V输入、同步降压型控制器,为DDR存储器提供完整的电源管理方案。MAX8553为VTT和VTTR提供1/2 VREFIN电压。VTT和VTTR跟踪电压保持在1%的1/2 VREFIN范围内。MAX8554为4.5V至28V输入、非跟踪降压型控制器,具有极低的0.6V反馈门限电压。MAX8553/MAX8554采用Maxim专有的Quick-PWM™结构,以提供快速的瞬态响应和工作于可选的非固定频率。这两个控制器工作时均无须外部偏置电源。

该类控制器工作于同步整流模式,以保证高达25A的平衡源出电流和吸流能力。MAX8553/MAX8554还能够提供高达95%的效率,使它们尤其适合于服务器和负载点应用。另外,极低的5µA关断电流使笔记本电脑应用中的电池寿命更长。无损耗电流监测是通过监视低端MOSFET的漏源电压实现的。MAX8553/MAX8554具有可调的折返电流限制,以承受连续的输出过载和短路。数字式软启动提供上电时对浪涌电流的控制。过压保护关断转换器并将输出电容放电。MAX8553/MAX8554采用节省空间的16引脚QSOP封装。
MAX8553、MAX8554:典型工作电路 MAX8553、MAX8554:典型工作电路 放大+

关键特性

  • 高达25A的输出电流能力
  • Quick-PWM控制结构提供快速的环路响应
  • 高达95%的效率
  • 4.5V至28V输入电压范围
  • 无需外部偏置电源
  • 0至3.6V输入REFIN电压范围(MAX8553)
  • 自动设置VTT和VTTR至±1% 1/2 VREFIN- (MAX8553)
  • 极低的0.6V反馈门限电压(MAX8554)
  • 200kHz/300kHz/400kHz/550kHz可选开关频率
  • 可调的折返电流限制
  • 过压保护
  • 数字软启动

应用

  • AGTL总线端接电源
  • ASIC和CPU核电压
  • DDR I与DDR II存储器电源
  • 笔记本电脑与LCD-PC电源
  • 服务器与存储系统
  • 宽范围输入电源

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)
MAX8553 4.528025
MAX8554 0.6

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。
产品可靠性报告: MAX8553.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。

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