An actuator drive circuit includes a counter starting counting of a
frequency-divided clock obtained by dividing a frequency of a reference
clock in response to an activation signal, a D/A converter providing a
converted voltage increasing gradually and stepwise in response to an
output of the counter, a coil current control amplifier comparing a coil
current detection voltage corresponding to a value of a coil current of
the actuator with the converted voltage immediately after activation,
comparing the coil current detection voltage with a coil current
limitation reference voltage corresponding to an upper limit value of the
coil current after the converted voltage matches the coil current
limitation reference voltage, and providing an amplified output voltage
prepared by amplifying a difference between the compared voltages, and a
drive current output circuit providing a drive current of the actuator
according to the amplified output voltage of the coil current control
amplifier.