Semiconductor device, electronic system device, and driving method thereof

A method of driving an electronic system device, the electronic system device comprising:

• a power generating device for generating a first power supply voltage;
• a semiconductor device including a control circuit including a field-effect transistor and coupled with the power generating device via a power supply node, and a substrate bias control circuit coupled with the control circuit;
• a DC-DC converter coupled with the power generating device in parallel with the control circuit via the power supply node;
• and
• a switch arranged between the power supply node and the DC-DC converter and coupled with the power supply node and the DC-DC converter,
• wherein the control circuit receives the first power supply voltage via the power supply node,
• wherein the switch is set from an OFF state to an ON state by the control circuit after the control circuit receives the first power supply voltage,
• wherein the DC-DC converter receives the first power supply voltage via the switch after the switch is controlled to the ON state,
• wherein the substrate bias control circuit supplies a substrate bias voltage to the field-effect transistor 1) before the DC-DC converter receives the first power supply voltage, 2) after the control circuit receives the first power supply voltage, and 3) before the first switch is set from the OFF state to the ON state,
• wherein the field-effect transistor includes:
• a substrate;
• a well region formed in the substrate;
• a semiconductor layer formed on the well region via an insulating film;
• a source region, a drain region and a channel region formed in the semiconductor layer;
• and
• a gate electrode disposed on the channel region via a gate insulating film,
• wherein the substrate bias control circuit supplies the substrate bias voltage to the well region,
• wherein the electronic system device further includes a first capacitor,
• wherein the semiconductor device includes:
• a second switch arranged between the power generating device and the power supply node;
• and
• a first monitor circuit coupled via a second power supply node between the second switch and the power generating device, and
• wherein the first capacitor is coupled with the second power supply node in parallel with the first monitor circuit, and wherein the first monitor circuit controls the second switch based on a voltage of the second power supply node.