数据手册MAX1845 .pdf [英文Rev.2(PDF,616kB)]

{状况:生产中。}

The MAX1845 is a dual PWM controller configured for step-down (buck) topologies that provides high efficiency, excellent transient response, and high DC output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers. The CS_ inputs can be used with low-side sense resistors to provide accurate current limits or can be connected to LX_, using low-side MOSFETs as current-sense elements. The on-demand PWM controllers are free running, constant on-time with input feed-forward. This configuration provides ultra-fast transient response, wide input-output differential range, low supply current, and tight load-regulation characteristics. The MAX1845 is simple and easy to compensate. Single-stage buck conversion allows the MAX1845 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery at a higher switching frequency) allows the minimum possible physical size. The MAX1845 is intended for generating chipset, DRAM, CPU I/O, or other low-voltage supplies down to 1V. For a single-output version, refer to the MAX1844 data sheet. The MAX1845 is available in 28-pin QSOP and 36-pin thin QFN packages.

产品关键特性
  • Ultra-High Efficiency
  • Accurate Current-Limit Option
  • Quick-PWM™ with 100ns Load-Step Response
  • 1% VOUT Accuracy over Line and Load
  • Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs
  • Adjustable 1V to 5.5V Output Range
  • 2V to 28V Battery Input Range
  • 200/300/420/540kHz Nominal Switching Frequency
  • Adjustable Overvoltage Protection
  • 1.7ms Digital Soft-Start
  • Drives Large Synchronous-Rectifier FETs
  • Power-Good Window Comparator
  • 2V ±1% Reference Output
应用与使用范围
  • 1.8V与2.5V I/O电源
  • 芯片组/RAM供电,电压可低至1V
  • CPU核电源
  • 笔记本电脑
最简工作电路

芯片订购型号
订购型号产品状态封装形式工作温度RoHS/无铅
MAX1845EEI生产中QSOP;28引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:否材料分析
MAX1845EEI+生产中QSOP;28引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX1845EEI+T生产中QSOP;28引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX1845EEI-T生产中QSOP;28引脚封装信息-40°C至+85°C参考数据资料
MAX1845ETX生产中TQFN;36引脚;37.2mm²封装信息-40°C至+85°CRoHS/无铅:否材料分析
MAX1845ETX+生产中TQFN;36引脚;37.2mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX1845ETX+T生产中TQFN;36引脚;37.2mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX1845ETX-T生产中QFN;36引脚封装信息-40°C至+85°C参考数据资料
评估板与开发套件
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