On-chip reconfigurable SC power supply with adaptive gain/pulse control for self-powered energy-efficient devices

Motivated by emerging self-sustained low-power applications, this paper presents a new integrated power supply solution with reconfigurable step-up/down switched-capacitor power stage and adaptive gain/pulse control, featuring variable gain ratios, low ripples and fast transient responses. The converter was designed with TSMC 0.35-mum digital CMOS N-well process. With an input voltage ranging from 1.5 to 3.3 V, the converter achieves variable step-up/down voltage conversion with an output from 0.9 to 2.7 V with a maximum efficiency of 88%. The steady-state peak-to-peak ripple voltage is controlled below 14 mV. Load transient response to a 50-mA step change is 7 mus. Input current ripples and output voltage ripples are significantly reduced compared to the prior arts. The design can be easily extended and reconfigured for different operation scenarios.