Voltage converter and power management device including the same

A voltage converter comprising:

• a converting circuit having an inductor connected to a switching node, a first switch element connected between the switching node and a ground voltage, and a second switch element connected between the switching node and an output node;
• and
• a switching control circuit configured to adjust a feedback voltage derived from the output node, and configured to generate a first switching control signal provided to the first switch element for charging the inductor and a second switching control signal provided to the second switch element for discharging a voltage charged in the inductor, using the adjusted feedback voltage,
• wherein the switching control circuit further includes a ripple injection circuit configured to generate a reverse phase voltage of a voltage of the switching node, and configured to generate a ripple injection voltage for adjustment of the feedback voltage having the same phase as a current of the inductor using the reverse phase voltage.

A power management device comprising:

• a reference voltage generating circuit configured to generate a reference voltage;
• and
• a voltage converter configured to
• adjust a feedback voltage divided from an output voltage at an output node,
• perform pulse frequency modulation or pulse width modulation using the adjusted feedback voltage and the reference voltage to generate switching control signals, and
• convert an input voltage to the output voltage in response to the switching control signals,
• the voltage converter including a converting circuit having an inductor connected to an switching node, a first switch element connected to the switching node, and a second switch element connected between the switching node and the output node,
• the first switch element and the second switch element configured to switch for charging the inductor with the input voltage and discharging a voltage charged in the inductor in response to the switching control signals;
• and
• a switching control circuit configured to
• generate a ripple injection voltage having the same phase as a current of the inductor,
• adjust the feedback voltage using the ripple injection voltage, and
• generate the switching control signals using the adjusted feedback voltage.