Patent ID: 8035364
Filing Date: 2011-10-11
Classification: H02M,Y02B

Abstract:
1. A DC/DC converter comprising: a high-side MOSFET, an inductor and an output capacitor connected in series between an input terminal and a supply voltage terminal; a freewheeling clamp comprising a freewheeling MOSFET connected in parallel with the inductor; break-before-make (BBM) circuitry connected to drive the gates of the high-side and freewheeling MOSFETs, respectively; a pulse-width modulation circuit connected to drive the BBM circuitry; and an output terminal coupled to a node between the inductor and the output capacitor; wherein the BBM circuitry comprises a first BBM buffer having an output terminal connected to drive the gate of the freewheeling MOSFET, a first supply terminal of the first BBM buffer being connected through a second diode to the input terminal, a second supply terminal of the first BBM buffer being connected through a third MOSFET to the supply voltage terminal and through a fourth MOSFET to a common node between the inductor and the output capacitor, to a bootstrap capacitor being connected between the first and second supply terminals of the first BBM buffer.