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MAX1845：双路、高效率、降压型控制器，带有精确限流

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 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

MAX1845：最简工作电路 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

数据手册DataSheet

关键参数

开发工具

• MAX1845EVKIT

技术资料

• Choosing the Right DC-DC Converter for Automotive Applications

质量和环境数据

• MAX1845.pdf

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