数据手册：MAX1844 .pdf [英文Rev.3(PDF,872kB)]
{状况：生产中，但该系列产品中的某些型号已进入最后一次购买期限。请查看订购信息。}The MAX1844 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core or chipset/RAM supplies in notebook computers. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. Efficiency is enhanced by an ability to drive very large synchronous-rectifier MOSFETs. Accurate current sensing to ensure reliable overload protection is available using an external current-sense resistor in series with the synchronous rectifier. Alternatively, the synchronous rectifier itself can be used for less accurate current sensing at the lowest possible power dissipation. Single-stage buck conversion allows the MAX1844 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 MAX1844 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 1V. It is available in 20-pin QSOP, and QFN packages and includes both adjustable overvoltage and undervoltage protection. For a dual step-down PWM controller with accurate current limit, refer to the MAX1845. The MAX1714/ MAX1715 single/dual PWM controllers are similar to the MAX1844/MAX1845 but do not use current-sense resistors.
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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 |
| MAX1844EEP | 生产中 | QSOP；20引脚；54.2mm²封装信息 | -40°C至+85°C | |
| MAX1844EEP+ | 停止供货 | MAX17007A | QSOP；20引脚；54.2mm²封装信息 | -40°C至+85°C |
| MAX1844EEP+T | 停止供货 | MAX17007A | QSOP；20引脚；54.2mm²封装信息 | -40°C至+85°C |
| MAX1844EEP-T | 生产中 | QSOP；20引脚；54.2mm²封装信息 | -40°C至+85°C | |
| MAX1844EGP | 停止供货 | MAX17007AGTI+ | QFN；20引脚；26mm²封装信息 | -40°C至+85°C |
| MAX1844EGP-T | 停止供货 | MAX17007AGTI+ | QFN；20引脚封装信息 | -40°C至+85°C |
| MAX1844ETP | 最后一次购买 | TQFN；20引脚；26mm²封装信息 | -40°C至+85°C | |
| MAX1844ETP+ | 停止供货 | MAX17007A | TQFN；20引脚；26mm²封装信息 | -40°C至+85°C |
| MAX1844ETP+T | 停止供货 | MAX17007A | TQFN；20引脚；26mm²封装信息 | -40°C至+85°C |
| MAX1844ETP-T | 最后一次购买 | QFN；20引脚封装信息 | -40°C至+85°C |
