Charging and discharging control circuit and battery device

A charging and discharging control circuit having a control circuit that controls charging and discharging of a secondary battery using a single bidirectional conduction type field effect transistor, comprising:

• a switching circuit that controls the gate of the bidirectional conduction type field effect transistor on the basis of an output of the control circuit;
• a first transistor of which the drain is connected to the drain of the bidirectional conduction type field effect transistor, the gate is connected to the source of the bidirectional conduction type field effect transistor, and the source and the back gate are connected to a first terminal of the switching circuit;
• and
• a second transistor of which the drain is connected to the source of the bidirectional conduction type field effect transistor, the gate is connected to the drain of the bidirectional conduction type field effect transistor, and the source and the back gate are connected to the first terminal of the switching circuit.