LDO REGULATOR, POWER MANAGEMENT SYSTEM AND LDO VOLTAGE CONTROL METHOD

摘要

An LDO regulator and a method therefor are disclosed. The LDO regulator comprises: an analog-digital converting part for converting a feedback analog voltage signal into a first digital signal and generating a second digital signal corresponding to a difference between the first digital signal and a target digital signal; a phase synthesis part for generating a first control signal having a pulse width corresponding to error information included in the second digital signal via the phase synthesis of signals generated by delay of a clock cycle unit and skewed delay in a clock cycle based on the second digital signal; a charge pump circuit for selecting a charge loop or a discharge loop based on polarity information included in the second digital signal and generating an output control voltage according to an electric current flowing through an interval corresponding to the pulse width of the first control signal in the selected loop; and an output circuit for generating an output voltage according to switching operation with respect to an input voltage based on the output control voltage, and generating the feedback analog voltage signal from the output voltage.;COPYRIGHT KIPO 2015