Substrate voltage generator and method therefor in a semiconductor device having internal stepped-down power supply voltage

摘要

A semiconductor device having an internal voltage down converter includes a circuit operating with an externally applied power supply voltage, a circuit operating with an internal stepped-down voltage as an operation power supply voltage, and substrate voltage generators for generating a substrate bias voltage according to a state of the internal stepped-down voltage. The present invention makes it possible to stably apply a substrate voltage corresponding to an operation voltage to the substrate region.