ZCC3855国产化替代LTC3855 双通道同步降压型DC/DC控制器

FeaTures
n Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noisen High Efficiency: Up to 95%n RSENSE or DCR Current Sensingn Programmable DCR Temperature Compensationn ±0.75% 0.6V Output Voltage Accuracy n Phase-Lockable Fixed Frequency 250kHz to 770kHzn True Remote Sensing Differential Amplifiern Dual N-Channel MOSFET Synchronous Driven Wide VIN Range: 4.5V to 38Vn VOUT Range: 0.6V to 12.5V without Differential Amplifiern VOUT Range: 0.6V to 3.3V with Differential Amplifiern Clock Input and Output for Up to 12-Phase Operationn Adjustable Soft-Start or VOUT Trackingn Foldback Output Current Limitingn Output Overvoltage Protectionn 40-Pin (6mm × 6mm) QFN and 38-Lead FE Packages

DescripTion
The ZCC3855 is a dual multiphase 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 ZCC3855 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.The ZCC3855 can be configured for up to 12-phase operation, has DCR temperature compensation, two power good signals and two current limit set pins. The ZCC3855 is available in low profile 40-pin 6mm × 6mm QFN and 38-lead exposed pad FE packages.