LP2953_15 Datasheet, PDF (26/41 Pages) Texas Instruments – LP295x Adjustable Micropower Low-Dropout Voltage Regulators

LP2952-N, LP2952A, LP2953, LP2953A
SNVS095F – MAY 2004 – REVISED MARCH 2015
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8.2.5 5-V Battery Powered Supply With Backup and Low Battery Flag
Figure 39 is the example circuit for 5-V battery powered supply with backup and low battery flag, it has the
following features:
• The circuit switches to the NI-CAD backup battery when the main battery voltage drops below about 5.6 V
and returns to the main battery when its voltage is recharged to about 6 V.
• The 5-V MAIN output powers circuitry which requires no backup, and the 5-V MEMORY output powers critical
circuitry which cannot be allowed to lose power.
• The BATTERY LOW flag goes low whenever the circuit switches to the NI-CAD backup battery.
Figure 39. 5-V Battery Powered Supply With Backup and Low Battery Flag
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