LP2950 Datasheet, PDF (17/26 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

Typical Applications (Continued)
Low Drift Current Source
5 Volt Current Limiter
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*Minimum input-output voltage ranges from 40mV to 400mV, depending on
load current. Current limit is typically 160mA.
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Regulator with Early Warning and Auxiliary Output
Latch Off When Error Flag Occurs
j Early warning flag on low input voltage
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j Main output latches off at lower input voltages
j Battery backup on auxiliary output
j 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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