A method and an apparatus for DC-to-DC conversion are provided. The apparatus is a DC-to-DC converter including a first feedback current control circuit coupled to a first voltage output of the DC-to-DC converter. The first feedback current control circuit is configured to generate a first control current based on a voltage difference between a first reference voltage and the first voltage output of the DC-to-DC converter. The apparatus further includes a constant charge comparator coupled to the first feedback current control circuit and configured to compare an integrated error signal to a threshold to generate a comparison result, the integrated error signal comprising an integration of a first error signal over time, the first error signal based on the first control current.