| 摘要 |
<p>[Problem] To provide a power supply device capable of reliably supplying power to a load circuit even in a case in which output voltage of a battery has decreased. [Solution] The invention is provided with: a first FET (1a) in which a drain (D1) is connected to an input terminal (11), a source (S1) is connected to an output terminal (12), and which is off in a state in which the same voltage is supplied to the drain (D1) and a gate (G1); a boosting circuit (3) which boosts output voltage from the output terminal (12); and a control circuit (4) which is connected to the boosting circuit (3) and a load circuit (52). It is possible to set the invention on in a state in which the same voltage is supplied to a drain (D2) and a gate (G2), and the invention is set so that: a second FET (2a), which can be controlled by the control circuit (4), is connected to the first FET (1a); at a start time of power supply to the load circuit (52), the second FET (2a) is set on; and voltage is supplied to the boosting circuit (3) via the second FET (2a).</p> |
