8.3 A 10.9W 93.4%-Efficient (27W 97%-Efficient) Flying-Inductor Hybrid DC-DC Converter Suitable for 1-Cell (2-Cell) Battery Charging Applications

The annual increase in performance and feature density of mobile products has driven the need for batteries with higher capacity and thus higher power-delivery solutions to maintain sensible charging times. The USB-C power-delivery specification was developed to meet these higher demands by enabling the input supply VBUS voltage at a higher setting, e.g., 9V, to allow higher power delivery, up to 100W, while minimizing current levels and associated IR drops across the USB-C cable. To bridge the increased gap from this input voltage to charge one-and two-cell battery products, a power-and space-efficient DC-DC converter is desirable.