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This paper presents a new integrated reconfigurable switched-capacitor dc-dc converter with a dual-loop adaptive gain-pulse control. The converter employs interleaving dual cell power stage for low ripple voltage and fast load transient. It effectively exploits a reconfigurable power stage structure to achieve for fast gain control and adaptive pulse control. The converter was designed with TSMC 0.35-mum CMOS N-well process. With an input voltage ranging from 2.1 to 3.3 V, the converter achieves variable step-down voltage conversion with an output from 0.9 to 1.8 V and a maximum efficiency of 76%. The measured line regulation is 6 mV/V. The system has continuous dynamic voltage scaling capability with the tracking speeds of 7.1 mus/V and 23.3 mus/V for step-up and step-down voltage changes, respectively. The research provides an effective solution to fast-transient low-ripple integrated power converters.