公开(公告)号：US11522363B2

公开(公告)日：2022-12-06

申请号：US16555220

申请日：2019-08-29

Applicant: STMicroelectronics S.r.l.

Inventor： Manuela La Rosa ,  Giovanni Sicurella ,  Giuseppe Meola

IPC: H02H11/00 ,  G05F3/20

Abstract: An input node is configured to receive a supply signal which may be of a first polarity or a second polarity opposite the first polarity. A high input current circuit couples the input node to an output node through at least one power transistor having a control electrode. A low input current circuit couples a supply current from the input node to control circuit configured to control the power transistor. A circuit is provided to detect polarity reversal with respect to the supply signal. A protection circuit for the low input current circuit operates to decouple the control circuit from the input node if the supply signal has the second polarity. A protection circuit for the high input current circuit operates to short-circuit the control electrode of the power transistor to the current path provided by the power transistor between the input node and the output node.