Dc-dc converter

A DC-DC converter, receiving a DC input voltage from a voltage source having a first terminal and a second terminal, and the DC-DC converter comprising:

• N upper switches electrically connected in series, wherein one end of the N upper switches is electrically connected to the first terminal of the voltage source;
• N lower switches electrically connected in series, wherein the N lower switches are electrically connected between the N upper switches and the second terminal of the voltage source, wherein a first lower switch of the N lower switches is connected with a first upper switch of the N upper switches;
• N pairs of flying capacitors, wherein a n-th pair of the N pairs of flying capacitors is coupled between a common node between the n-th and (n+1)-th upper switches and a common node between the n-th and (n+1)-th lower switches, wherein n=1, 2, . . . , (N−1), a N-th pair of the N pairs of flying capacitors is coupled with the N-th upper switch and the N-th lower switch;
• and
• N subcircuits, wherein a first subcircuit of the N subcircuits is coupled between a common node between the first upper switch and the first lower switch and a middle node of a first pair of the N pairs of flying capacitors, and a i-th subcircuit of the N subcircuits is coupled between a middle node of a (i−1)-th pair of the N pairs of flying capacitors and a middle node of a i-th pair of the N pairs of flying capacitors, and i=2, . . . , N;
• wherein N is greater than or equal to 2.