Peak Current Mode Controlled Four-Phase DC-DC Converter with Fast Load Transient Response

Abstract

With the increasing demand for dynamic performance of power management integrated circuits (PMICs) in 5G portable devices, this paper proposes a peak current mode (PCM) controlled four-phase parallel DC-DC converter to enhance system stability and load dynamic response capability. By introducing inductor current feedback and ramp compensation, the risk of subharmonic oscillation is eliminated. Meanwhile, the four-phase interleaved topology (90° phase difference) significantly reduces I²R losses and achieves current ripple cancellation; a Type II compensation network designed based on the small-signal model realizes a bandwidth of 90kHz and a phase margin of 40°. Simplis simulation verification shows that the output voltage stabilizes at 1V under steady state, and the currents of each phase are evenly shared; when the load steps by ±5A, the transient deviation of the output voltage is suppressed to 50mV, with a recovery time of 200μs.