INTEGRATED CIRCUIT CONTROL OF ANTI-SERIES SWITCHES

摘要

An integrated circuit controls one or more external back-to-back (anti-series) transistor switches with three pins per switch. Two pins couple the switch terminals of the external switch to terminals of an internal anti-series switch. An intermediate source node of the internal switch provides a reference voltage that is representative of the external switch's intermediate source node. A predriver of the integrated circuit drives a gate signal relative to the reference voltage, enabling fast, non-dissipative switching of the external switch. A disclosed method includes coupling switch terminal signals from an external anti-series switch to terminals of an internal anti-series switch; and driving a gate signal to the external anti-series switch relative to a reference voltage of an intermediate node of the internal anti-series switch.

主权项

1. An integrated circuit comprising:
a gate pin that couples to a shared gate node of two source-connected transistors forming an external anti-series switch between two switch terminals, the external anti-series switch having an external intermediate node that lacks a dedicated pin from the integrated circuit; two terminal pins that couple to the two switch terminals; an internal anti-series switch including two integrated transistors between the two terminal pins, the two integrated transistors having an internal intermediate node that connects their sources, the internal intermediate node providing a reference voltage; and a controller with a predriver that drives the gate pin relative to the reference voltage.