Invention Grant
US07728565B2 Non-invasive load current sensing in low dropout (LDO) regulators
失效
低压差(LDO)调节器中的非侵入式负载电流检测
- Patent Title: Non-invasive load current sensing in low dropout (LDO) regulators
- Patent Title (中): 低压差(LDO)调节器中的非侵入式负载电流检测
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Application No.: US11938354Application Date: 2007-11-12
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Publication No.: US07728565B2Publication Date: 2010-06-01
- Inventor: Michael A. Wyatt
- Applicant: Michael A. Wyatt
- Applicant Address: US DE Wilmington
- Assignee: ITT Manufacturing Enterprises, Inc.
- Current Assignee: ITT Manufacturing Enterprises, Inc.
- Current Assignee Address: US DE Wilmington
- Agency: RatnerPrestia
- Main IPC: G05F1/613
- IPC: G05F1/613 ; G05F1/575

Abstract:
A low dropout (LDO) voltage regulator includes an output terminal for providing a regulated voltage output to a load, and a plurality of PFETs connected in parallel. Each PFET drains a level of current and the sum of the levels of current are provided as a current output at the output terminal. The LDO voltage regulator also includes a feedback network coupled to the output terminal for providing a voltage feedback signal, and an error amplifier coupled between the plurality of PFETs and the feedback network for sensing a differential voltage. The error amplifier includes an output voltage which is provided to the plurality of PFETs for adjusting the drain of current from each PFET. A summation of the drains of current from each PFET is provided as the current output to regulate the voltage output at the output terminal. Each PFET drains a current level of I0/n and the summation of the drains of current is the current output I0.
Public/Granted literature
- US20090121694A1 NON-INVASIVE LOAD CURRENT SENSING IN LOW DROPOUT (LDO) REGULATORS Public/Granted day:2009-05-14
Information query
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