Voltage regulator dropout detection
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United States of America Patent
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Jul 26, 2022
Grant Date -
N/A
app pub date -
Nov 19, 2020
filing date -
Nov 19, 2020
priority date (Note) -
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Abstract
A dropout detection circuit for an LDO voltage regulator is disclosed. An LDO voltage regulator includes a power transistor having a drain terminal coupled to an output voltage node and a gate terminal coupled to an output of an error amplifier. A source terminal of the power transistor is coupled to an input voltage node. The circuit further includes a detection circuit having a first input coupled to the gate terminal and a second input coupled to the drain terminal. The detection circuit is configured to generate an indication responsive to detecting that the LDO voltage regulator has entered operation below a minimum dropout.
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