A novel adaptive hysteresis DC-DC buck converter for portable devices

Abstract

This paper presents a new technique that adjusts the hysteresis window depending on the variations in loadcurrent caused by a voltage-mode circuit to reduce the voltage and current ripples. Moreover, a compact current-sensing circuit is used to provide an accurate sensing signal for achieving fast hysteresis window adjustment. In addition, a zero-current detection circuit is also proposed to eliminate the reverse current at light loads. As a result, this technique reduces the voltage ripple below 8.08 mVpp and the current ripple below 93.98 mApp for a load current of 500 mA. Circuit simulation is performed using 0.18 µm CMOS process parameters.