According to the specific characteristics

digital DC-DC converters are easy to be integrated with other digital systems.There exist many digital control algorithms

and some complex algorithms need integrated ADCs

which enhance the difficulty of designing.Some simple schemes use single comparator as the feedback input

showing poor dynamic performance.A new digital control scheme for DC-DC converter with variable voltage-step feedback was presented and it is based on the Buck converter of no-ADC

single-comparator and constant voltage-step feedback.Because only single comparators or window comparators are used

this scheme is easy to be implemented.It can dynamically alter the duty-cycle increments according to the feedback input

which can effectively reduce the dynamic response time under sudden changes of the application environment without enhancing the complexity of the architecture notably.