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Analysis of A 2x/1.5x/1x Moded Mode DC-DC Converter Designed by Using Switched- Capacitor Techniques
Authors: Kei Eguchi, Takahiro Inoue, Ichirou Oota, Hongbing Zhu, Fumio Ueno
Number of views: 370
For mobile applications, a switched-capacitor (SC) DC-DC converter which offers a 2x/ 1.5x/ 1x mode
of operation is presented, and its properties are analyzed theoretically in this paper. Aimed at back-lighting applications, battery applications, etc., the proposed converter provides stepped-up/stepped-down voltages. Compared with the conventional approaches employing doubler circuits, the proposed converter can realize high efficiency and flexibility of output voltages. The validity of the proposed converter is confirmed by SPICE simulations and theoretical analyses. Concerning the power efficiency and the optimal duty factor, the confirmation result shows that the theoretical results correspond to the simulation results well. Furthermore, under the conditions that the input voltage Vin=3.7V, the output load RL, and the output voltage Vout=3.3 - 5.3V, the proposed converter can improve the power efficiency more than twice from that of the conventional circuit.