The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2012
Filed:
Apr. 13, 2010
Fumio Tonomura, Kanagawa, JP;
Fumio Tonomura, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-shi, Kanagawa, JP;
Abstract
It is desired for semiconductor devices to reduce an inrush current and an overshoot. According to the voltage regulator circuit of the present invention, when a power supply is turned on, a switch SWis turned on in response to a control signal CTR, a switch SWis turned off, and a reference voltage Vref is input to the first (+IN) and second (−IN) inputs of a differential amplifier AMPas a common voltage. When a common voltage is supplied to the first (+IN) and second (−IN) inputs, the current I flows into a smoothing capacitor Cfrom the high-voltage power supply (VDD) via the differential amplifier AMPis regulated to be small. Namely, an inrush current can be reduced. Further, according to the voltage regulator circuitof the present invention, the increase of the output voltage Vout from the differential amplifier AMPis relaxed so that the overshoot can be suppressed.