Linear LTC3855双路多相降压电源控制方案

Linear 公司的LTC3855是双路PolyPhase多相电流模式同步降压开关电源控制器,能驱动所有的N沟功率MOSFET.效率高达95%, RSENSE 或 DCR电流检测,输出电压精度±0.75% 0.6V,可锁相固定频率250kHz 到770kHz,可用于计算机系统,通信系统,工业和医疗设备,DC电源分布系统.本文介绍LTC3855主要特性,功能方框图, 高效双路1.2V/40A电源, 带NTC温度补偿DCR检测的2.5V/15A和1.8V/15A电源, 小型双相0.9V/50A电源等多种电源电路.

The LTC®3855 is a dual PolyPhase® current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. It includes a high speed differential remote sense amplifier. The maximum current sense voltage is programmable for either 30mV, 50mV or 75mV, allowing the use of either the inductor DCR or a discrete sense resistor as the sensing element.

The LTC3855 features a precision 0.6V reference and can produce output voltages up to 12.5V. A wide 4.5V to 38V input supply range encompasses most intermediate bus voltages and battery chemistries. Power loss and supply noise are minimized by operating the two controller output stages out of phase. Burst Mode® operation, continuous or pulse-skipping modes are supported.
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