VOLTAGE CONVERTER FOR POWER MANAGEMENT

摘要

A voltage converter includes a converting circuit and a switching control circuit, where the converting circuit includes an inductor connected to a switching node, a first switching device connected between the switching node and a common voltage and a second switching device connected to the switching node, where the first switching device charges the inductor and discharges the inductor in response to a control signal, and the switching control circuit generates the control signal by performing a PWM and a PFM based on a first sensing signal, a second sensing signal and a feedback signal, and adjusts a charging time of the inductor on a time basis, based on at least the input power supply voltage when the switching control circuit performs the PFM.

主权项

1. A voltage converter comprising:
a converting circuit including an inductor connected to a switching node, a first switching device connected between the switching node and a common voltage and a second switching device connected between the switching node and an output node, the first switching device configured to charge an input power supply voltage in the inductor and configured to discharge the inductor in response to a driving control signal; and a switching control circuit configured to generate the driving control signal by performing a pulse-width modulation (PWM) and a pulse-frequency modulation (PFM) based on a first sensing signal, a second sensing signal and a feedback voltage, the first sensing signal and the second sensing signal being based on a sensed current flowing through the first switching device, the feedback voltage being obtained by dividing an output voltage at the output node, wherein the switching control circuit is configured to adjust a charging time of the inductor on time basis, based on at least the input voltage when the switching control circuit performs the PFM.