Charge-pump capacitor power dissipation in voltage converters
The process of charging a capacitor via a resistor, even if the resistor is very small, produces an energy (or IIR) loss each cycle. An inductor based switching regulator doesn’t suffer from this theoretical loss because the energy that can be put into an inductor by connecting it momentarily across a supply voltage (as in the case of a boost regulator), is performed losslessly.
Going back to the charging capacitor scenario, it’s an interesting subject that has accrued several questions on this site and, it can be shown that whatever value of series charging resistor, the energy lost per cycle in the resistor is the same. Basically, the energy taken from the supply voltage to top up the capacitor is always more than what eventually gets stored in the capacitor hence, it takes on the mantle of an inefficient component even though theoretically that inefficiency is external to the capacitor.