Supply independent low quiescent current undervoltage lockout circuit
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United States of America Patent
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-
Jan 11, 2005
Grant Date -
Oct 3, 2002
app pub date -
Mar 26, 2002
filing date -
Mar 27, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The UVLO (undervoltage lockout) circuit provides a very low quiescent current that is independent of supply voltage. The circuit includes a low voltage IPTAT (current proportional to absolute temperature) generator coupled to a comparator 24 wherein a first input of the comparator 24 is coupled to the IPTAT generator in a way that forms a bandgap voltage with respect to ground and a second input of the comparator 24 is coupled to the IPTAT generator in a way that forms a bandgap voltage with respect to a supply node. This makes the quiescent current independent of the supply voltage because there is no voltage divider between the supply node and ground.
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