Patent ID: 7466112
Filing Date: 2008-12-16
Classification: H02M

Abstract:
1. A regulator circuit for step-up and step-down operation having an input connectable to a power source and an output connectable to a load, the regulator circuit comprising: an inductor having first and second terminals; a first switch connected between the first inductor terminal and an input terminal; a second switch connected between the second inductor terminal and a node; a first rectifying device connected between the first inductor terminal and the node; a second rectifying device connected between the second inductor terminal and an output terminal; a sensing element for sensing inductor current connected between the common connection and a node joining the second switch and the first rectifying device; and a control circuit responsive to sensed inductor current for controlling activation and deactivation of at least one of the switches for a constant time to regulate voltage at the output to a preset voltage.