Patent ID: 7202694
Filing Date: 2007-04-10
Classification: H02M

Abstract:
1. A circuit to sense the current through an inductor of an integrated switching boost converter using an NMOS pass device comprises: a first branch, wherein one terminal is connected to a battery voltage and the other terminal is connected to the drain of said NMOS pass device in a second branch, wherein said first branch is comprising said inductor; a second branch comprising a PMOS transistor, an NMOS transistor, and an NMOS pass device, wherein said first branch is connected to the drain of said NMOS pass device, the source of the NMOS pass device is connected to V a third branch comprising a PMOS transistor, an NMOS transistor, and an NMOS device, wherein said NMOS device is a replica, smaller in size, of said NMOS pass device of the second branch, wherein the source of the NMOS device is connected to V a fourth branch comprising a PMOS transistor, wherein its gate is connected to the gates of the PMOS transistors of the second and third branch, its source is connected to V