公开(公告)号：US20040178778A1

公开(公告)日：2004-09-16

申请号：US10731884

申请日：2003-12-09

Applicant: STMicroelectronics PVT. LTD.

Inventor： Nitin Bansal

IPC: G05F001/40

CPC classification number: G05F1/575

Abstract: An integrated Low Dropout (LDO) linear voltage regulator provides improved current limiting. A differential voltage amplifier compares an output voltage to reference voltage and controls a pass transistor to make the output voltage substantially match the reference voltage. This is accomplished by sensing the output voltage of the voltage regulator for application to a first input of the differential amplifier and coupling a second input of the differential amplifier to the reference voltage. A current sense transistor utilizes current mirroring techniques to sense the current passing through the pass transistor to the output. This sensed current is compared to a reference current. The result of that comparison is fed back to the differential voltage amplifier to in a manner that increases the apparently sensed output voltage in situations where the sensed current exceeds the reference current.

Abstract translation: 集成的低压差（LDO）线性稳压器提供改进的电流限制。 差分电压放大器将输出电压与参考电压进行比较，并且控制通过晶体管以使输出电压基本上与参考电压相匹配。 这是通过感测电压调节器的输出电压来实现的，以将其应用于差分放大器的第一输入并将差分放大器的第二输入端耦合到参考电压。 电流检测晶体管利用电流镜像技术来检测通过传输晶体管的电流到输出。 将该感测电流与参考电流进行比较。 该比较的结果被反馈到差分电压放大器，以在感测电流超过参考电流的情况下增加明显感测的输出电压。