Patent ID: 6404172
Filing Date: 2002-06-11
Classification: H02M

Abstract:
An integrated buck or boost converter comprises:a first transistor having a first drain, a first source, and a first gate; a second transistor having a second drain, a second source, and a second gate, wherein the second source is coupled to a reference potential and wherein the first source is coupled to the second drain; a third transistor having a third drain, a third source, and a third gate, wherein the third source is coupled to an external load and the third drain is coupled to an external inductor; an output sensing circuit operably coupled to the external load, wherein the output sensing circuit senses a representation of an output voltage and to produce therefrom a charge signal; and control module coupled to the first gate, to the second gate, and to the third gate, wherein the control module is operably coupled to receive the charge signal and a buck/boost signal, wherein, when the buck/boost signal indicates buck operation: the control module generates a buck control signal that is provided to the first and second gates, the control module generates a load control signal that is provided to the third gate, the first drain is operably coupled to an external power source, and the first source is operably coupled to the external inductor; wherein, when the buck/boost signal indicates boost operation: the control module generates a boost control signal that is provided to the second gate, the control module generates the load control signal that is provided to the third gate, the second drain is operably coupled to a node coupling the external inductor to the third transistor, and the external inductor is coupled to the external power source.