Low leakage power switch

A method, comprising:

• receiving, by a switch control circuit, a first request to open a power switch coupled to a power supply signal and a power terminal of a circuit block;
• selectively coupling or decoupling the circuit block and the power supply signal by the power switch using a switch control signal;
• determining, by a sensor circuit, a leakage current of the power switch;
• in response to receiving the first request:
• determining a first target voltage level, greater than a voltage level of the power supply signal, for the switch control signal using the leakage current;
• and
• transitioning a voltage level of the switch control signal from an initial voltage to the first target voltage level.

A system, comprising:

• a power management unit configured to generate an internal power supply signal using an external power supply signal;
• a processor;
• a power switch coupled to a power terminal of the processor and the internal power supply signal, wherein the power switch is configured to selectively couple or decouple the processor from the internal power supply signal using a switch control signal;
• a sensor circuit configured to determine a leakage current of the power switch;
• and
• a switch control circuit configured to:
• receive a first request to open the power switch;
• in response to receiving the first request:
• determine a first target voltage level, greater than a voltage level of the internal power supply signal, for the switch control signal using the leakage current;
• and
• transition a voltage level of the switch control signal from an initial voltage to the first target voltage level.