High Power Density and Efficiency Hybrid Interleaved DC-DC Converter with Continuous Conversion Ratio

In a hybrid DC-DC converter (20), an input terminal (202) receives an input voltage (VI) and an output terminal (204) produces an output voltage (VO). A first capacitor (C1) is coupled between a first node (206) and a second node (208), a second capacitor (C2) is coupled between a third node (210) and a fourth node (212), and a third capacitor (C3) is coupled between a fifth node (214) and a sixth node (216). The second node (208) and the output terminal (204) are configured for coupling to an inductor (L1). During each switching cycle (TSW) of the converter (20), a control circuit controls some switching circuitry in a first phase (F1) and a second phase (F2). In the first phase, the first node (206) is coupled to the input terminal (202), the second node (208) and the third node (210) are coupled to each other, the fourth node (212) is coupled to ground (GND), the fifth node (214) is coupled to the output terminal (204), and the sixth node (216) is coupled to ground (GND). In the last phase, the first node (206) and the fourth node (212) and the fifth node (214) are coupled to each other, the second node (208) is coupled to ground (GND), the third node (210) is coupled to the input terminal (202), and the sixth node (216) is coupled to the output terminal (204).