Patent ID: 8686708

Claim:
A switching circuit comprising: a switching section including at least one first terminal, a plurality of second terminals, and a switching element configured to connect the first terminal to one of the second terminals; a driver configured to drive the switching element in accordance with an external terminal switching control signal; a DC-to-DC converter including an oscillator configured to oscillate at a lower oscillation frequency in a second state than an oscillation frequency in a first state, a charge pump configured to operate in response to an output of the oscillator, and an another charge pump configured to operate in response to the output of the oscillator, the DC-to-DC converter configured to output a positive voltage and a negative voltage to the driver, and an absolute value of an output current for each of the positive voltage and the negative voltage in the first state being larger than an absolute value in the second state; and a power controller configured to control the DC-to-DC converter to operate with the first state during a first time period determined based on the change of the external terminal switching control signal, and to operate with the second state during a second time period other than the first time period.