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| LP2951JAN_15 Datasheet, PDF (16/25 Pages) Texas Instruments – Series of Adjustable Micropower Voltage Regulators | |||
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LP2951JAN
SNVS408A â NOVEMBER 2010 â REVISED APRIL 2013
www.ti.com
Figure 39. Low Drift Current Source
Early warning flag on low input voltage
Main output latches off at lower input voltages
Battery backup on auxiliary output
Operation: Reg. #1's Vout is programmed one diode drop above 5V. Its error flag becomes active when Vin ⤠5.7V.
When Vin drops below 5.3V, the error flag of Reg. #2 becomes active and via Q1 latches the main output off. When
Vin again exceeds 5.7V Reg. #1 is back in regulation and the early warning signal rises, unlatching Reg. #2 via D3.
Figure 40. Regulator with Early Warning and Auxiliary Output
16
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