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Efficiency%scalingconst.Self-recovery hysteresis control basedon-chip SC DC-DC converter robust to load fluctuation1Total loss Adaptive frequency scaling Minimize power loss2Conventional Single Boundary Hysteresis ControlSC DC-DCConverterT-latchSpikeFast response,Simple architectureStuck problem to load current spikeMax.ave3Proposed control systemSC DC-DC converterT-latchDelayStartupOscillatorPulseGeneratorStartupRefresh signal makes high stateKeep switching below the boundary4Measurement results