4.15 W SIDO Buck Converter with Low Cross Regulation Using Adaptive PCCM Control

A 4.15 W SIDO buck converter is proposed in this paper. By using the adaptive PCCM control, the FW (freewheel) phase is automatic adjusted to improve the efficiency, which is the weakness in traditional PCCM control. Besides, the current mode comparison is utilized, such that the comparators are not required for the mode control. The proposed design is implemented using TSMC 0.18 μm CMOS HV process. Based on the simulation results, the circuit achieves the cross regulation of 0.097 mV/mA and 0.066 mV/mA for the dual outputs with the load current variation from 0.5 A to 0.4 A and from 0.45 A to 0.5 A, respectively.