Current limit protection circuit for a voltage regulator
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United States of America Patent
Stats
-
Oct 15, 2002
Grant Date -
Aug 29, 2002
app pub date -
Dec 31, 2001
filing date -
Jan 2, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A voltage regulator includes a power transistor receiving a drive current, and a current limit protection circuit connected to the power transistor. The current limit protection circuit includes a first resistance connected to the power transistor for sensing an output current, a limit switch transistor connected to the power transistor and to the first resistance, and a current generator and second resistance connected thereto. The current generator and second resistance biases the limit switch transistor to divert drive current from the power transistor based upon the output current through the first resistance exceeding a threshold. The first resistance has a value less than a value of the second resistance. The first resistance can be made considerably smaller than otherwise to thereby reduce power consumption. The temperature coefficient for the second resistance is balanced with respect to a temperature coefficient for the first resistance so that a output current from the voltage regulator is not sensitive to temperature variations.
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