Negative voltage circuit

A negative voltage circuit comprising:

• an inverter circuit configured to perform a charging operation and a discharging operation in response to a driving signal;
• a first dual current circuit connected between the inverter circuit and a first operating voltage terminal, and configured to supply a first current for a charging operation of the inverter circuit based on a start-up mode, and supply a second current for the charging operation of the inverter circuit based on a normal operating mode;
• a second dual current circuit connected between the inverter circuit and a second operating voltage terminal to and configured to supply a third current for a discharging operation of the inverter circuit based on the start-up mode, and supply a fourth current for the discharging operation of the inverter circuit based on the normal operating mode;
• a load switching circuit configured to connect an output node of the inverter circuit to one of an output terminal of the negative voltage circuit and the second operating voltage terminal in response to the driving signal;
• a load capacitor circuit connected between the output terminal of the negative voltage circuit and a ground, and configured to stabilize a negative voltage at the output terminal;
• and
• an operating mode control circuit configured to control the first dual current circuit and the second dual current circuit in response to the negative voltage at the output terminal.

A negative voltage circuit comprising:

• an oscillator configured to provide a driving signal;
• a first dual current circuit configured to supply a first current to perform a charging operation based on a start-up mode and supply a second current to perform the charging operation based on a normal operation mode;
• a second dual current circuit configured to supply a third current to perform a discharging operation based on the start-up mode, and supply a fourth current to perform the discharging operation based on the normal operation mode;
• and
• an operating mode controlling circuit comprising a hysteresis comparator configured to generate a first control signal, and an inversion circuit configured to generate a second control signal based on the first control signal;
• wherein the first control signal and the second control signal are provided to the first dual current circuit and the second dual current circuit to control the start-up mode and the normal operation mode.