Bi-directional voltage converter of smart card and smart card including the same

A bi-directional voltage converter of a smart card configured to perform a fingerprint authentication, the bi-directional voltage converter comprising:

• a dead time generator configured to generate a first output signal and a second output signal having non-overlapping activation intervals with each other based on a reference clock signal;
• a gate driving circuit configured to generate first through fourth clock signals based on the first output signal, the second output signal, a first sub power-down signal and a second sub power-down signal, at least some of the first through fourth clock signals having non-overlapping activation intervals with one another;
• a switching circuit including first through fourth switching elements connected in series between an input node and a ground voltage, the first through fourth switching elements configured to be switched in response to respective ones of the first through fourth clock signals, and configured to store an output voltage applied to an output node in a storage capacitor coupled between a first node and a second node, in a boosting operation;
• a start-up circuit including a first start-up transistor and a second start-up transistor connected in series between the input node and the output node, the first start-up transistor and the second start-up transistor configured to be switched in response to a first delayed clock signal and a second delayed clock signal to provide the output voltage stored in the storage capacitor to the input node in the boosting operation, the first delayed clock signal and the second delayed clock signal having non-overlapping activation intervals with each other;
• and
• a delayed clock signal generation circuit configured to generate the first delayed clock signal and the second delayed clock signal based on the first output signal, the second output signal and the second sub power-down signal.