Invention Grant
US06952091B2 Integrated low dropout linear voltage regulator with improved current limiting
有权
集成低压差线性稳压器,具有改进的电流限制
- Patent Title: Integrated low dropout linear voltage regulator with improved current limiting
- Patent Title (中): 集成低压差线性稳压器,具有改进的电流限制
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Application No.: US10731884Application Date: 2003-12-09
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Publication No.: US06952091B2Publication Date: 2005-10-04
- Inventor: Nitin Bansal
- Applicant: Nitin Bansal
- Applicant Address: IN
- Assignee: STMicroelectronics Pvt. Ltd.
- Current Assignee: STMicroelectronics Pvt. Ltd.
- Current Assignee Address: IN
- Agency: Jenkens & Gilchrist, P.C.
- Priority: IN1237/DEL/2002 20021210
- Main IPC: G05F1/575
- IPC: G05F1/575 ; G05F1/573

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.
Public/Granted literature
- US20040178778A1 Integrated low dropout linear voltage regulator with improved current limiting Public/Granted day:2004-09-16
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