| 摘要 |
A semiconductor integrated circuit device includes: a semiconductor switching element; an input voltage detection circuit that outputs a voltage correlated to an input voltage; an oscillator circuit that oscillates on the basis of the voltage outputted by the input voltage detection circuit; a control logic that generates a drive signal; a power supply circuit that boosts a battery voltage; a buffer that level-shifts the drive voltage outputted by the control logic; and an amplification element that operates using a voltage generated by the semiconductor switching element as a power supply. Thus, the semiconductor switching element can be on/off controlled so that switching loss at low load can be reduced while preventing the peak current flowing into the inductor coil from depending on the input voltage.
|
