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BQ25504: VIN max of harvester chip

Part Number: BQ25504
Other Parts Discussed in Thread: BQ25570, , BQ25505

Hi, 

I'm comparing the VIN of the BQ25504 and BQ25570. Both have an absolut maximum rating of -0.3 to 5.5 V, but the VIN of the BQ25570 goes up 5.1V whereas the VIN of the BQ25504 goes only up to 3V. 

What is the reason for this difference? 

I intended to use a IXYS KXOB22-01X8F solar cell with the BQ25504, which has a Voc = 4.7V and Vmpp = 3.4V. See  http://ixapps.ixys.com/DataSheet/KXOB22-01X8F_Nov16.pdf

Would this work?

Best Regards 

Eric