公开(公告)号：US20190265744A1

公开(公告)日：2019-08-29

申请号：US16250365

申请日：2019-01-17

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Hideyuki TAJIMA

IPC: G05F3/24 ,  G01R19/165

Abstract: A semiconductor device includes: a drive transistor controlling current supply to a load; a current detector unit detecting a current of a sense transistor through which a current proportional to the current flowing through the drive transistor flows; a controller unit generating a pulse signal with a duty ratio corresponding to the detection result of the current detector unit; a voltage monitor monitoring whether a voltage of an external output terminal reaches a battery voltage; and a pre-driver performing charge and discharge to a control terminal of the drive transistor based on the pulse signal. The pre-driver performs the charge and discharge to the control terminal of the drive transistor at a first speed, when the voltage of the external output terminal reaches the battery voltage, and at a speed faster than the first speed, when the voltage of the external output terminal reaches the battery voltage.