Low drop-out regulator
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United States of America Patent
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-
Jul 6, 2004
Grant Date -
N/A
app pub date -
Oct 1, 2002
filing date -
Oct 1, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A first capacitive circuit is coupled to an output of a low drop-out (LDO) regulator. A second capacitive circuit is selectively coupled to a power supply signal circuit and arranged to store charge when the LDO regulator is deactivated. When the LDO regulator is activated, a portion of the charge on the second capacitive circuit is transferred to the first capacitive circuit. The LDO regulator provides an output when the charge associated with the first capacitive circuit reaches a predetermined level. The power-on time of the LDO regulator depends on the time required to increase the charges of the first capacitance circuit to the predetermined level from a level associated with the transferred charge from the second capacitive circuit. Also, the presence of the first capacitive circuit prevents noise associated with the power supply from being reflected at the output of the LDO regulator.
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