Electronic device performing direct voltage to direct voltage conversion converting an input voltage to a fixed output voltage and operating method of electronic device

An operating method of an electronic device which includes an inductor, a capacitor, a first switch and a second switch associated with buck conversion, and a third switch and a fourth switch associated with boost conversion, the method comprising:

• extracting first current information about the buck conversion from the first switch and extracting second current information about the boost conversion from the third switch;
• dividing an output voltage of an output node to generate a feedback voltage;
• generating a first control signal based on the first current information and the feedback voltage, the first control signal being set periodically and reset when the feedback voltage is lower than a first target level;
• generating a second control signal based on the second current information and the feedback voltage, the second control signal being set periodically and is reset when the feedback voltage is lower than a second target level;
• controlling the first, second, third, and fourth switches based on the first and second control signals such that the buck conversion is performed, in a first mode;
• controlling the first, second, third, and fourth switches based on the second current information such that the boost conversion is performed, in a third mode;
• and
• controlling the first, second, third, and fourth switches based on the first current information and the second current information such that buck-boost conversion is performed, in a second mode.

An electronic device comprising:

• a direct voltage to direct voltage converter;
• and
• a controller configured to control the direct voltage to direct voltage converter,
• wherein the direct voltage to direct voltage converter includes:
• an inductor connected between a first node and a second node;
• a first switch connected between the first node and an input node;
• a second switch connected between the first node and a ground node;
• a third switch connected between the second node and the ground node;
• a fourth switch connected between the second node and an output node;
• a capacitor connected between the output node and the ground node;
• and
• resistors connected in series between the output node and the ground node, and configured to generate a feedback voltage smaller than an output voltage of the output node, and
• wherein the controller is configured to
• select a first mode when an input voltage of the input node is higher than a first level, to select a third mode when the input voltage is lower than a second level lower than the first level, and to select a second mode when the input voltage is equal to or lower than the first level and is equal to or higher than the second level;
• and
• control the first, second, third, and fourth switches based on a set and a reset of the first control signal such that buck conversion is performed, in the first mode, to control the first, second, third, and fourth switches based on a set and a reset of the second control signal such that boost conversion is performed, in the third mode, and to control the first, second, third, and fourth switches based on the set and the reset of the first control signal and the set and the reset of the second control signal such that buck-boost conversion is performed, in the second mode, and
• wherein the controller includes:
• a first conversion controller configured to output a first control signal which is set periodically and is reset when the feedback voltage is lower than a first target level;
• and
• a second conversion controller configured to output a second control signal which is set periodically and is reset when the feedback voltage is lower than a second target level.