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:
Nov. 11, 2008
Filed:
Nov. 30, 2006
Takayasu Ito, Tokyo, JP;
Mitsuru Hiraki, Tokyo, JP;
Satoshi Baba, Tokyo, JP;
Kenichi Fukui, Tokyo, JP;
Takayasu Ito, Tokyo, JP;
Mitsuru Hiraki, Tokyo, JP;
Satoshi Baba, Tokyo, JP;
Kenichi Fukui, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
In order to set with a high precision the value of rush current flowing in the power switch circuit at the time of turning 'on' the power, the internal circuit Int_Cir of the LSI is supplied with the internal source voltage Vint from the output transistor MPof the regulator VReg of the power switch circuit PSWC. The power switch circuit PSWC includes a control circuit CNTRLR and a start-up circuit STC. During the initial period Tint following the turning 'on' of the power supply, the start-up circuit STC controls the output transistor MPand reduces the primary rush current so that the output current Isup of the output transistor MPmay represent an approximately constant increment as the time passes. The difference ΔV between the internal current voltage due to the charge of load capacitance C with the output current Isup controlled by the start-up circuit STC and the current voltage Vint from the regulator VReg is set within the predetermined limit to reduce the secondary rush current.