Title: Low voltage detection circuit
Application Number: 200610142425 Application Date: 2006.10.24
Publication Number: 1956334 Publication Date: 2007.05.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03K17/22;G06F1/30;G01R19/00
Applicant(s) Name: Sanyo Electric Co. Address:
Inventor(s) Name: Sugano Takashi
Attorney & Agent: lixiang lan
Abstract:
    A low voltage detection circuit that is precise and highly reliable at the power-on as well as during normal operation is offered. The low voltage detection circuit includes a reference voltage generation circuit, a divider circuit, a comparator that serves as a comparison circuit, and a second constant current transistor connected in series with the divider circuit. An auxiliary current transistor as well as a first constant current transistor is connected in series with a load element. The auxiliary current transistor is controlled by a voltage at a drain of the second constant current transistor. A gate of the second constant current transistor and a gate of the first constant current transistor are connected with each other to form a current mirror. A size of the second constant current transistor is adjusted so that the second constant current transistor can provide a second constant current that is several times larger than a first constant current provided by the first constant current transistor.
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