Power supply method using a plurality of voltage sources and electronic device using the same

A power supply method of supplying an output current using a plurality of input voltages, the power supply method comprising:

• generating a first output current using a first input voltage among the plurality of input voltages;
• comparing the first input voltage to a first reference voltage to generate a first comparison result;
• generating a comparison signal corresponding to the first comparison result;
• generating a digital code indicating accumulated information of the comparison signal based on the comparison signal;
• based on the digital code indicating that the first input voltage is higher than a first reference voltage, supplying power using the first output current without using a second output current;
• and
• based on the digital code indicating that the first input voltage is lower than the first reference voltage, generating the second output current corresponding to the digital code using a second input voltage among the plurality of input voltages, and supplying power using the first output current and the second output current.

A display apparatus comprising:

• a power management device configured to supply a plurality of input voltages;
• a display panel configured to display image data;
• and
• a display driving circuit comprising a power module configured to supply power for driving the display apparatus, based on at least one input voltage received from the power management device,
• wherein the power module is further configured to:
• receive a first input voltage from the power management device,
• generate a first output current using the first input voltage,
• generate a second output current by receiving a second input voltage from the power management device based on the first input voltage being lower than a first reference voltage,
• based on the first input voltage being higher than the first reference voltage, supply power for driving the display apparatus, using the first output current without using the second output current, and
• based on the first input voltage being lower than the first reference voltage, supply the power for driving the display apparatus, using the first output current and the second output current,
• wherein, the power supplied using the first output current and the second output current is greater than the power supplied using the first output current without using the second output current.