The buck-boost charger has become increasingly popular in recent years given its ability to charge a battery from nearly any input source, regardless of whether the input voltage is higher or lower than the battery voltage.

Buck-boost charging has been widely used in personal electronic devices compatible with USB Type-C™ Power Delivery(USB PD) charging – because a fully integrated buck-boost charger that includes switching metal-oxide semiconductor field-effect transistors (MOSFETs), current-sensing circuitry and narrow VDC (NVDC) power path management can provide a fast charging solution with high power density. A buck-boost charger also integrates additional components in the USB PD charging system, such as load switches and DC/ DC converters, to streamline system design, reduce bill-of-materials (BOM) cost and keep the overall solution size small.