PROTECTION CIRCUIT FOR PREVENTING AN OVER-CURRENT FROM AN OUTPUT STAGE

摘要

A semiconductor device including: an output stage, including a PMOS, an NMOS and an output terminal, wherein a source terminal of the PMOS is connected to a first supply voltage, a drain terminal of the PMOS is connected to a drain terminal of the NMOS and the output terminal, a source terminal of the NMOS is connected to a second supply voltage, and the output terminal outputs an output signal; and a protection circuit, including a first voltage clamping circuit, including a first transistor, a second transistor and a first switch, wherein the first transistor and the second transistor are for clamping a gate voltage of the PMOS of the output stage and are connected in series, the first switch is coupled to the first supply voltage and a node between the first transistor and the second transistor for selectively coupling the first supply voltage to the node.

主权项

1. A semiconductor device, comprising:
an output stage, comprising a PMOS, an NMOS and an output terminal, wherein a source terminal of the PMOS is connected to a first supply voltage, a drain terminal of the PMOS is connected to a drain terminal of the NMOS and the output terminal, a source terminal of the NMOS is connected to a second supply voltage, and the output terminal outputs an output signal; and a protection circuit, comprising
a first voltage clamping circuit, comprising a first transistor, a second transistor and a first switch, wherein the first transistor and the second transistor are arranged to clamp a gate voltage of the PMOS of the output stage and are connected in series between the first supply voltage and a gate terminal of the PMOS, the first switch is coupled to the first supply voltage and a node between the first transistor and the second transistor, and the first switch is arranged to selectively couple the first supply voltage to the node between the first transistor and the second transistor.