Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 23, 2010
Patent Application Number
12132267
Date Filed
June 3, 2008
Patent Primary Examiner
Patent abstract
The present invention includes a pass transistor that limits current drawn from a circuit without using a series resistor and while drawing minimal current from an external supply. A current mirror of the output current is formed and compared to a reference current. When the output current increases, the mirror current increases proportionally, and when a threshold is crossed, the pass transistor is turned off. The pass transistor is biased from a charge pump that provides a voltage, a current from which a current mirror is drawn that controls the pass transistor.
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