Low-dropout regulator, power management system, and method of controlling low-dropout voltage

摘要

A low-dropout regulator comprises an analog-to-digital converter that converts a feedback analog voltage signal into a digital signal, a phase synthesizing unit that generates a first control signal having a pulse width corresponding to error information in the digital signal by performing phase synthesis according to clock skew control, a charge pump circuit that selects a charge loop or a discharge loop based on polarity information in the digital signal, and generates an output control voltage according to current that flows during a period corresponding to the pulse width of the first control signal in the selected loop, and an output circuit that generates an output voltage based on an input voltage and the output control voltage, and generates the feedback analog voltage signal based on the output voltage.

主权项

1. A low-dropout (LDO) regulator comprising:
an analog-to-digital converter (ADC) that converts a feedback analog voltage signal into a first digital signal, and generates a second digital signal corresponding to a difference between the first digital signal and a target digital signal; a phase synthesizing unit that generates a first control signal having a pulse width corresponding to error information in the second digital signal by performing phase synthesis on signals generated according to a skew delay within a clock cycle and a delay by one clock cycle based on the second digital signal; a charge pump circuit that selects a charge loop or a discharge loop based on polarity information in the second digital signal, and generates an output control voltage according to current that flows during a period corresponding to the pulse width of the first control signal in the selected loop; and an output circuit that generates an output voltage according to a switching operation performed on an input voltage based on the output control voltage, and generates the feedback analog voltage signal from the output voltage.