LP2953QML, LP2953QML-SP

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SNVS395C – NOVEMBER 2010 – REVISED APRIL 2013

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 37. 5V Battery Powered Supply with Backup and Low Battery Flag

Figure 38. 5V Regulator with Timed Power-On Reset

Figure 39. Timing Diagram for Timed Power-On Reset

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