Patent ID: 7511465

Claim:
A digital power supply for maintaining a regulated output voltage level, comprising: a power supply section for receiving control signals and converting an input DC voltage at a first level to an output regulated DC voltage; a voltage sense circuit for sensing the voltage level of said output regulated DC voltage to provide a representation thereof; a digital controller for generating said control signals as a function of the relationship between said sensed output regulated DC voltage and an analog reference voltage level; a data converter for generating a digital value representing the relationship between said analog reference voltage and said sensed output regulated DC voltage and variable and having a resolution defined by the size of a least significant (LSB) bit; said digital controller controlling said power supply section to vary the output voltage level of said power supply section to provide said output regulated DC voltage, said regulated DC voltage occurring when the sensed voltage from said sense circuit substantially equals said analog reference voltage; and an LSB controller for varying the size of the LSB of said data converter without varying the output of said data converter.