Microchip MIC21LV32 36V双相COT可堆叠降压控制器应用方案
Microchip公司的MIC21LV32是恒定导通时间控制模式(COT)两相同步降压控制器,具有独特的自适应导通时间控制架构和多达8相的可堆叠特性,器件工作输入电压从4.5V到36V,提供输出电流高达50A.输出电压可调整低至0.6V到28V,保证精度为±1%.器件每相的开关工作频率从100kHz到1MHz可编程. 超高速控制®架构支持在中重负载下的超快瞬态响应.软起动也由外接电容可编程,因此安全起动重负载.MIC21LV32有遥控检测放大器用来精确控制输出电压.器件还具有成套的保护特性,以保证在故障条件下的器件.这些保护特性包括欠压锁住,以保证电源下降条件下适当工作,可编软起动降低浪涌电流,打嗝模式短路保护和热关断. MIC21LV32采用32引脚5 mm x 5 mm VQFN封装,工作结温-40°C到+125°C.主要用在分布式电源系统,通信/网络设备,打印机,扫描仪,图像卡和视频卡以及FPGA,CPU,MEM,GPU核电源.本文介绍了MIC21LV32主要特性, 功能框图,典型应用电路以及4相配置连接图和MIC21LV32 评估板EV71S00A主要特性和连接图,电路图,材料清单和PCB设计图.
The MIC21LV32 is a constant on-time, dual phase synchronous buck controller featuring a unique adaptive on-time control architecture with stackable feature up to eight phases. The MIC21LV32 operates over an input supply range from 4.5V to 36V and can be used to supply up to 50A of output current. The output voltage is adjustable down to 0.6V with an ensured accuracy of ±1%. The device operates with programmable switching frequency from 100 kHz to 1 MHz per phase.
The Hyper Speed Control® architecture supports ultrafast transient response under medium to heavy loads.
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