Patent Number: 6,166,527

Title: Control circuit and method for maintaining high efficiency in a buck-boost switching regulator

Abstract: A high efficiency control circuit for operating a buck-boost switching regulator is provided. The switching regulator can regulate an output voltage higher, lower, or the same as the input voltage. The switching regulator may be synchronous or non-synchronous. The control circuit can operate the switching regulator in buck mode, boost mode, or buck-boost mode. In buck mode, the switching regulator regulates an output voltage that is less than the input voltage. In boost mode, the switching regulator regulates an output voltage that is greater than the input voltage. In buck and boost modes, less than all of the switches are switched ON and OFF to regulate the output voltage to conserve power. In buck-boost mode, all of the switches switch ON and OFF to regulate the output voltage to a value that is greater than, less than, or equal to the input voltage.

Inventors: Dwelley; David M. (Fremont, CA), Barcelo; Trevor W. (Mountain View, CA)

Assignee: Linear Technology Corporation

International Classification: H02M 3/158 (20060101); H02M 3/04 (20060101); G05F 001/10 ()

Expiration Date: 12/26/2017