Zero current detector

A zero current detector comprising:

• an input configured to receive a voltage signal;
• an output configured to produce a zero current detection signal based on the voltage signal;
• a first transistor and a second transistor coupled in series;
• an input stage coupled to the input, the first transistor, and the second transistor and configured to provide a first control signal to the first transistor and a second control signal to the second transistor;
• and
• a pre-charge circuit coupled to the second transistor in parallel with the input stage.

An integrated circuit, comprising:

• a power supply controller that includes:
• a control output configured to couple to a power supply switch;
• and
• an output configured to provide a signal that indicates whether the power supply switch is off;
• and
• a zero current detector coupled to the power supply controller that includes:
• a first transistor and a second transistor coupled in series, wherein the second transistor includes a gate;
• and
• a pre-charge circuit coupled to the gate of the second transistor and configured to pre-charge the gate of the second transistor based on the signal indicating that the power supply switch is off.