Fly-cap refresh circuit for buck-boost converter

A fly-cap refresh circuit for a buck-boost converter, comprising:

• a first fly capacitor connected to a buck capacitor of a buck converter of the buck-boost converter, and configured to prevent a discharge of the buck capacitor during one or more idle periods of a first switching node;
• a second fly capacitor connected to a boost capacitor of a boost converter of the buck-boost converter, and configured to prevent a discharge of the boost capacitor during the one or more idle periods of the first switching node;
• and
• a plurality of refresh switches connected between at least one of the first fly capacitor and the buck capacitor, the second fly capacitor and the boost capacitor, the first fly capacitor and a ground node, and the second fly capacitor and the ground node,
• wherein the plurality of refresh switches are configured to activate based on an operational mode of the buck-boost converter to control enabling the fly-cap refresh circuit, and
• wherein the operational mode includes at least one of a Continuous Conduction Mode (CCM) or a Pulse Frequency Modulation (PFM) mode.