A DC-DC converter can include: a switched capacitor converter including at least one switch group and at least one capacitor, where each of the at least one switch group includes two switches are coupled in series, and at least one of the capacitors is coupled in parallel with a corresponding one of the switch groups; and at least one switch converter, where each switch converter includes at least one primary magnetic circuit and is configured to share at least one of the switch groups, one terminal of the primary magnetic circuit is coupled to an intermediate node of the shared switch group, the intermediate node is a common coupling point of two switches of the shared switch group, and the switch converter is an unidirectional power converter.