Patent ID: 7804310
Filing Date: 2010-09-28
Classification: G01R

Abstract:
1. A current detection circuit comprising: a multi-source MOS transistor having a sense MOS transistor and a load MOS transistor, the multi-source MOS transistor being connected to a power supply and a load; a current detection portion having a negative input offset voltage characteristic to detect sense current flowing through the sense MOS transistor, one input of the current detection portion being connected to the power supply or the load MOS transistor, and the other input of the current detection portion being connected to the sense MOS transistor; and a calculation control portion to calculate load current flowing through the load based on a first sense current and a second sense current such that the effect of the input offset voltage is cancelled, the first sense current being the sense current when the current detection portion is connected to the power supply, and the second sense current being the sense current when the current detection portion is connected to the load MOS transistor.