Digital Low-Dropout Regulator-Assisted Buck DC-DC Converter Achieving 68-mV Droop Voltage and 95.5% Efficiency

This letter proposes a digital low-dropout regulator (DLDO)-assisted buck converter featuring one-step computational droop compensation and DLDO feedback-controlled current handover. The 28-nm test chip achieves a 68-mV droop voltage and a 112-ns settling time for a 1A/0.8ns load step while maintaining a high-peak efficiency of 95.5%.