Datasheet

LP2952-N, LP2952A, LP2953, LP2953A
SNVS095D –MAY 2004–REVISED SEPTEMBER 2013 www.ti.com
* Connect to Logic or μP control inputs.
LOW BATT flag warns the user that the battery has discharged down to about 5.8V, giving the user time to recharge
the battery or power down some hardware with high power requirements. The output is still in regulation at this time.
OUT OF REGULATION flag indicates when the battery is almost completely discharged, and can be used to initiate a
power-down sequence.
Figure 42. 5V Regulator with Error Flags for LOW BATTERY and OUT OF REGULATION
The circuit switches to the NI-CAD backup battery when the main battery voltage drops below about 5.6V, and returns
to the main battery when its voltage is recharged to about 6V.
The 5V MAIN output powers circuitry which requires no backup, and the 5V MEMORY output powers critical circuitry
which can not be allowed to lose power.
* The BATTERY LOW flag goes low whenever the circuit switches to the NI-CAD backup battery.
Figure 43. 5V Battery Powered Supply with Backup and Low Battery Flag
Figure 44. 5V Regulator with Timed Power-On Reset
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