Low leakage low dropout regulator with high bandwidth and power supply rejection, and associated methods

A method of operating an electronic device comprised of a low dropout regulator having an output coupled to a first conduction terminal of a transistor, with a second conduction terminal of the transistor being coupled to an output node of the electronic device, wherein the method comprises:

• placing the electronic device into a power on mode by:
• turning on the low dropout regulator,
• removing a DC bias from the second conduction terminal of the transistor by selectively decoupling the second conduction terminal of the transistor from a supply node and a ground node, and
• turning on the transistor;
• and
• placing the electronic device into a power down mode by:
• turning off the transistor,
• applying the DC bias at the second conduction terminal of the transistor by selectively coupling the second conduction terminal of the transistor to the supply node and the ground node, and
• turning off the low dropout regulator;
• wherein turning on the transistor when placing the electronic device into the power on mode comprises turning on the transistor after the DC bias is removed from the second conduction terminal of the transistor.

A method of operating an electronic device comprised of a low dropout regulator having an output coupled to a first conduction terminal of a transistor, with a second conduction terminal of the transistor being coupled to an output node of the electronic device, wherein the method comprises:

• placing the electronic device into a power on mode by:
• turning on the low dropout regulator,
• removing a DC bias from the second conduction terminal of the transistor by selectively decoupling the second conduction terminal of the transistor from a supply node and a ground node, and
• turning on the transistor;
• and
• placing the electronic device into a power down mode by:
• turning off the transistor,
• applying the DC bias at the second conduction terminal of the transistor by selectively coupling the second conduction terminal of the transistor to the supply node and the ground node, and
• turning off the low dropout regulator;
• wherein turning off the transistor when placing the electronic device into the power down mode comprises turning off the transistor after the DC bias is applied at the second conduction terminal of the transistor.