I would like to use the tps3610 to battery backup an MCU, SRAM and RTC.
My preferred method is to hook them as per the design shown in the data sheet, I get an interrupt from the PFO pin, do house keeping then shut down and if this process is still going when the power is gone then I can continue on battery until finished then go into standby.
This way I really don't need too much advanced warning about the power and the shutdown procedure it not as time critical.
However, it seems that the internal power switch in the chip has a high resistance when switching power from the battery, and is really only good for <15mA, I need up to 80mA until I shut down.
Am I correct in saying that I can't do the above, I have to have completed shutdown and entered standby by the time the chip switches to battery.
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Rob
