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Maxim产品 - MAX1845介绍

MAX1845 - 双路、高效率、降压型控制器，带有精确限流

MAX1845是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1845是双路、高效率、降压型控制器，带有精确限流，本站介绍了MAX1845的封装应用图解、特点和优点、功能等，并给出了与MAX1845相关的Maxim元器件型号供参考。

MAX1845 - 双路、高效率、降压型控制器，带有精确限流 - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

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.

关键特性
  • 以下关键特性由Maxim美信半导体提供：
  • 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
    • 热门应用
  • 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
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