High voltage output current measuring and limiting device for use in e.g. linear regulator, has negative-channel metal oxide semiconductor current limiting device limits current of negative-channel metal oxide semiconductor

摘要

The device has metal oxide semiconductor (MOS) transistors (36, 39) that are provided with a thin gate oxide and a wide drain (38). The MOS transistors are classified as drain-wide type transistors e.g. double-diffused MOS (DMOS), drain extended MOS (DEMOS) and laterally diffused MOS (LDMOS). A positive-channel MOS (PMOS) current limiting device limits current of PMOS when an output stage includes a PMOS power transistor. A negative-channel MOS (NMOS) current limiting device limits current of NMOS when the output stage includes a NMOS power transistor.