Internal voltage generator in integrated circuit, selects one of reference voltages generated based on external voltage and internal voltage, for controlling internal voltage generation

摘要

The reference voltage generators generate reference voltages (VREF1,VREF2), based on reception of the external voltage (VDD-EXT) and internal voltage (VDD-INT), respectively. A controller controls a switch to select one of reference voltages based on comparison of output of a timer and a threshold value. A voltage regulator provides the internal voltage on reception of selected reference voltage. An independent claim is also included for method for generating an internal voltage.