Voltage converter capable of adaptively operating in one of synchronous mode and asynchronous mode

A voltage converter capable of operating in one of a synchronous mode and an asynchronous mode according to an input voltage of an input terminal, the voltage converter comprising:

• a voltage detector configured to generate a detection result according to the input voltage of the input terminal;
• a switch control circuit configured to receive the detection result and an output voltage of an output terminal and thereby generate a first switch control signal and a second switch control signal;
• a first switch configured to be intermittently turned on according to the first switch control signal in the synchronous mode and the asynchronous mode;
• a second switch configured to be intermittently turned on according to the second switch control signal in the synchronous mode and to be turned off according to the second switch control signal in the asynchronous mode, wherein the first switch and the second switch are different kinds of transistors and are not turned on simultaneously, and the output voltage is adjusted without using the second switch in the asynchronous mode;
• and
• an energy storage circuit electrically connected to the input terminal and the output terminal, and the energy storage circuit configured to store and release energy according to on-off states of the first switch and the second switch and thereby adjust the output voltage according to the input voltage.