VSIMO: A DC-DC SIMO-based Current Mismatch Compensator Supporting Per-Output Bidirectional Power Flow for Stacked Voltage Domains Achieving >82% System Efficiency under up to 360-mA Load Mismatch

This paper presents VSIMO, a single -inductor multiple -output (SIMO) compensator for a four -layer stacked-voltage-domain system. It features a novel bidirectional power -flow technique that dynamically configures each output to operate in either supply or sink mode to efficiently compensate current mismatch between domains. The 65 -nm VSIMO prototype takes a 2.4-V input and regulates three outputs (0.6, 1.2, 1.8V). It achieves >82% system efficiency under up to 360-mA current mismatch, advancing the maximum current mismatch and system efficiency of stacked-voltage-domain systems.