After a lot of googling around I'm also torn on bq25504 or LTC3106.
My requirements are:
-mppt for really small solar panel voltages (bq25504)
-charging of LIPO's (I guess both)
-battery backup switch on threshold (LTC3106)
Why cant I have both :-) ?
LTC4419 from Linear seems to be a nice fit for pairing with the bq25504.
Any other combinations with the featurelist above?
But would rather stays in a single package for cost and pcb real-estate reasons..