LP2950-N, LP2951-N
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SNVS764N –JANUARY 2000–REVISED MAY 2013
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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 53. Regulator with Early Warning and Auxiliary Output
Figure 54. Latch Off When Error Flag Occurs
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