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LTC4412 with simultaneously loading a power source accu

Hello,

is it possible to connect a diode and a resistor from WALL ADAPTER INPUT to BATTERY CELLS in order to keep an MiMH accumulator (3 Cells, placed instead the BATTERY CELLS) continuously loading/refreshing?

Like:

WALL ADAPTER INPUT -> Diode Anode -> Diode Cathode -> Resistor -> BATTERY CELLS

a) Will the "ideal diode" still work in this case, when the WALL ADAPTER INPUT is disconnected? The Accumulator shall be switched on LOAD then.

b) Is the switchover fast enough to keep an µC seemlessly working?

Thank you in adavance

Chris