Driving device, switching power supply apparatus, and vehicle

A driving device configured to drive a switching element, the driving device comprising

• a variation unit configured to vary a current supply capability with respect to a control terminal of the switching element during a period from startup to shutdown of the driving device,
• wherein the variation unit includes:
• a plurality of first transistors configured to be individually controlled, at a time of turning on the switching element, to perform current supply to the control terminal and not to perform the current supply thereto;
• and
• a second transistor configured to perform current supply to the control terminal at the time of turning on the switching element,
• wherein the second transistor has a current supply capability with respect to the control terminal larger than a current supply capability of each of the plurality of first transistors with respect to the control terminal, and
• the second transistor and the plurality of first transistors are configured to operate in order of steps (i) to (v) at the time of turning on the switching element, wherein steps (i) to (v) are:
• (i) performing the current supply from the second transistor to the control terminal;
• (ii) performing the current supply from either the second transistor or the plurality of first transistors to the control terminal;
• (iii) performing the current supply from both of the second transistor and the plurality of first transistors to the control terminal;
• (iv) performing the current supply from either the second transistor or the plurality of first transistors to the control terminal;
• and
• (v) performing the current supply from the second transistor to the control terminal.