a system for protecting a weak device operating in micro - electronic circuit that includes a high voltage power supply from high voltage over stressing prevents the weak device from failing during power - up , power - down , and when a low voltage power supply in a multiple power supply system is absent . the system includes a low voltage power supply detection circuit configured to detect circuit power - up , circuit power - down , and when the low voltage power supply is absent , and generate a control signal upon detection . the system further includes a controlled current mirror device configured to provide a trickle current to maintain a conduction channel in the weak device in response to the control signal received from the low voltage power supply detection circuit during circuit power - up , circuit power - down , and when the low voltage power supply is absent .