A switched capacitor power converter comprising: an input terminal; an output terminal; a plurality of capacitors; a plurality of switches for selectively connecting the plurality of capacitors to each other, and / or to the input terminal, and / or to the output terminal; and a controller configured to operate the plurality of switches based on an output voltage, such that one or more of the plurality capacitors are connected between the input terminal and the output terminal as either: a first-topology, to provide a first conversion ratio; or a second-topology, to provide a second conversion ratio, wherein the second conversion ratio is different to the first conversion ratio.