Patent ID: 8294439
Filing Date: 2012-10-23
Classification: H02J,H02M

Abstract:
1. A buck-boost switching regulator comprising: an inductor having a first terminal and a second terminal; a first power switch having one terminal coupled to the first terminal of the inductor and another terminal coupled to an input voltage; a second power switch having one terminal coupled to the first terminal of the inductor and another terminal coupled to ground; a third power switch having one terminal coupled to the second terminal of the inductor and another terminal coupled to ground; a fourth power switch having one terminal coupled to the second terminal of the inductor and another terminal coupled to an output voltage; and a control circuit controlling the operation of the four power switches such that: when the switching regulator is operating in a buck conversion mode, the first and the second power switches operate and the third and the fourth power switches do not operate; when the switching regulator is operating in a boost conversion mode, the third and the fourth power switches operate and the first and the second power switches do not operate; and when the switching regulator is operating in a buck-boost conversion mode, the first and the second power switches operate according to a predetermined first pulse width and the third and the fourth power switches operate according to a predetermined second pulse width.