Invention Grant
- Patent Title: Area-efficient voltage regulators
- Patent Title (中): 区域效率的电压调节器
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Application No.: US12890215Application Date: 2010-09-24
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Publication No.: US08373398B2Publication Date: 2013-02-12
- Inventor: Wooseok Kim
- Applicant: Wooseok Kim
- Applicant Address: US MA Norwood
- Assignee: Analog Devices, Inc.
- Current Assignee: Analog Devices, Inc.
- Current Assignee Address: US MA Norwood
- Agency: Koppel, Patrick, Heybl & Philpott
- Main IPC: G05F1/40
- IPC: G05F1/40

Abstract:
Area-efficient voltage regulators are provided in which a first transistor has a first breakdown voltage and a first on-state resistance and a second transistor has a second breakdown voltage that exceeds the first breakdown voltage and a second on-state resistance that exceeds the first on-state resistance. With this arrangement, the second transistor can be biased to raise an output voltage. When the difference between an input voltage and the output voltage is less than a predetermined voltage, the second transistor is disabled and the first transistor is controlled to provide the output voltage at a wherein the controlling is preferably performed with a feedback control loop. The die area of the first transistor can be reduced because its on-state breakdown need only exceed the predetermined voltage rather than the substantially-higher input voltage. Because of the reduced on-state breakdown, the die area of the first transistor can be reduced and still obtain a low on-state resistance rDS(ON) that will enhance the efficiency of the voltage regulator. The die area of the second transistor can be reduced because this transistor is not on after the difference between the output voltage and the input voltage is within the predetermined voltage. The second transistor can therefore be configured with a high on-state resistance rDS(ON) without degrading the performance of the voltage regulator. The die area of the second transistor can thus be reduced while still obtaining breakdown voltages greater than the input voltage.
Public/Granted literature
- US20120074921A1 AREA-EFFICIENT VOLTAGE REGULATORS Public/Granted day:2012-03-29
Information query
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