Low voltage switch control

A low-voltage control apparatus, comprising:

• a first pick-high circuit configured to receive a rail voltage and a charge pump voltage, and to provide the higher of the rail voltage and the charge pump voltage as a pick-high voltage;
• a second pick-high circuit configured to receive a source voltage and a first terminal voltage of a pass gate, and to provide the higher of the source voltage and the first terminal voltage as the rail voltage;
• and
• a low-voltage control circuit configured to receive the charge pump voltage, the rail voltage, and a switch control signal, the low-voltage control circuit configured to receive the pick-high voltage from the first pick-high circuit;
• the low-voltage control circuit configured to provide the charge pump voltage when the switch control signal is in a first state, and to provide the higher of the charge pump voltage and the rail voltage when the switch control signal is in a second state,
• the switch control signal in the first state including the pick-high voltage of the first pick-high circuit.

A method comprising:

• producing a pick-high voltage at a first pick-high circuit based on a rail voltage and a charge pump voltage;
• producing a rail voltage at a second pick-high circuit based on a source voltage and a first terminal voltage of a pass gate;
• receiving the charge pump voltage, the rail voltage, and a switch control signal at a low-voltage control circuit;
• providing the higher of the charge pump voltage and the rail voltage as a pick-high voltage to the low-voltage control circuit;
• and
• providing the charge pump voltage at an output of the low-voltage control circuit when the switch control signal is in a first state, and the higher of the charge pump voltage and the rail voltage when the switch control signal is in a second state.