Series regulator circuit with high current mode activating parallel charging path
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United States of America Patent
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Aug 31, 2010
Grant Date -
Oct 23, 2008
app pub date -
Sep 13, 2007
filing date -
Sep 26, 2006
priority date (Note) -
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Abstract
A series regulator circuit for reducing current consumption, enabling switching between different current consumption modes, and suppressing output voltage fluctuations. A constant current source 20, connected to an input voltage line, is connected to a ground voltage line via a resistor element 21 and transistor B1. Gate terminals of transistors M2, M4 are connected between the constant current source 20 and transistor B1. The transistor M2 is connected to the input voltage line via a transistor M1 activated in a high current mode. The source terminals of the transistors M2, M4 function as the series regulator circuit output terminal, which is connected to the ground voltage line via a resistor element 23 and transistor M3, activated in a high current mode, or via resistor elements 24, 25. A connection node between the resistor elements 24, 25 is connected to a base voltage of the transistor B1.
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