A charge pump circuit is provided. The charge pump circuit includes a first transistor, a first capacitor, a second transistor, and a second capacitor. The first transistor has a first end and a second end. The first capacitor has a first end and a second end. The second end of the first capacitor is electrically connected to the second end of the first transistor. The second transistor has a first end and a second end. The first end of the second transistor is electrically connected to the second of the first transistor. The second capacitor has a first end and a second end. The first end of the second capacitor is electrically connected to the second end of the second transistor.