公开(公告)号：US09991794B2

公开(公告)日：2018-06-05

申请号：US15077080

申请日：2016-03-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Michael Lueders ,  Erich Bayer ,  Thomas Schaeffner ,  Giacomo Calabrese

IPC: H02M3/158

CPC classification number: H02M3/158

Abstract: An inverting buck voltage converter constructed of a switched-mode hybrid topology, with a capacitive input stage and an inductive output stage. The input stage operates as a charge pump to charge a flying capacitor connected in series with an inductor in the output stage. Clock circuitry generates first and second non-overlapping clock phases. In the second clock phase, the flying capacitor is charged to the input voltage, with a flying node between the flying capacitor and the output inductor connected at ground through a rectifier, while in the first clock phase, the flying capacitor supports the inductor current. The arrangement of the flying capacitor and inductor is such that the voltage appearing at the output terminal is inverted from the input voltage. Continuous output current is provided. Current limiting techniques protect the flying capacitor from overcurrent conditions.