LP2951JAN Datasheet, PDF (16/24 Pages) Texas Instruments – Adjustable Micropower Voltage Regulators

Low Drift Current Source
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Regulator with Early Warning and Auxiliary Output
■ Early warning flag on low input voltage
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■ Main output latches off at lower input voltages
■ Battery backup on auxiliary output
■ Operation: Reg. #1's V_out is programmed one diode drop above 5V. Its error flag becomes active when V_in ≤ 5.7V. When V_in drops below 5.3V, the error flag
of Reg. #2 becomes active and via Q1 latches the main output off. When V_in again exceeds 5.7V Reg. #1 is back in regulation and the early warning signal rises,
unlatching Reg. #2 via D3.
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