公开(公告)号：JPH0677741A

公开(公告)日：1994-03-18

申请号：JP14343093

申请日：1993-06-15

Applicant: SGS THOMSON MICROELECTRONICS ,  MARELLI AUTRONICA

Inventor： ARUBERUTO POOMA ,  BANNI PORETSUTO ,  MARUKO MORERI

IPC: H01L27/06 ,  H03F1/52 ,  H03K17/06 ,  H03K17/082

Abstract: PURPOSE: To provide a simple circuit configuration which has excellent frequency stability and performs accurate current control. CONSTITUTION: A resistance (Rs) is in series with a drain-source path of a MOS power transistor (M1). A feed terminal (J) of a mutual conductance operational amplifier (A) is connected to an output part for boosting a voltage or of a charging pump(CP) circuit that can output a voltage higher than a voltage of a power source (Vs) to which the drain of the MOS transistor (M1) is connected. An input part of the amplifier (A) is connected to the resistance (Rs), its output part is connected to a gate of the MOS transistor (M1) and as the result a maximum current flowing to the power transistor (M1) at time of the operation is limited to a value proportional to a reference voltage (VR).