A battery-connected 24-ratio switched capacitor PMIC achieving 95.5%-efficiency

A switched-capacitor (SC) PMIC is presented that achieves up to a 6.6-bit resolution with only 5 flying capacitors for inductive PMIC replacement. The flying capacitors are reused in a frequency-scaled gear train as well as charge-feedback SC topologies to attain a 2.4× reduction in capacitors number compared to prior art. In 0.25μm bulk, the PMIC operates from an input voltage of 2.5-5V, can generate an output voltage ranging from 0.2-2V, and features an average efficiency of 90.2% across the entire range and a peak efficiency of 95.5%.