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:
Oct. 05, 2004
Filed:
Jun. 21, 2002
Atsuo Fukui, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
A voltage regulator is provided in which an abnormal operation of an overcurrent protection circuit is prevented. The voltage regulator makes operating states of a PMOS output driver transistor and a first PMOS sense transistor always the same to set a ratio of currents flowing to the transistors equal to a transistor size ratio thereof, thereby solving the problem that a load current under which an overcurrent protection operates becomes inaccurate by the decrease in an output voltage due to an abnormal operation of an overcurrent protection circuit in the case in which a different of an input voltage VIN and an output voltage VOUT is small and the influence of channel length modulation in the case in which the difference of an input voltage VIN and an output voltage VOUT is large.