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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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 |
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