Switch controller with adaptive control of reference and back-gate voltages

A circuit comprising:

• a switch having a first terminal, a second terminal, and a control terminal, the switch being an n-channel field-effect transistor (NFET);
• an error amplifier having a first terminal, a second terminal, and a third terminal, the second terminal of the error amplifier coupled to the second terminal of the switch;
• and
• reference voltage control circuitry having a first terminal, a second terminal, and a third terminal, the third terminal of the reference voltage control circuitry coupled to the first terminal of the error amplifier.

A switch controller comprising:

• an error amplifier;
• and
• reference voltage control circuitry coupled to the error amplifier and configurable to:
• provide a first reference voltage to the error amplifier responsive to an input voltage being less than a target output voltage;
• and
• provide a second reference voltage to the error amplifier if the input voltage is greater than or equal to the target output voltage.