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BQ25505: BQ25505 input pins impedance

Part Number: BQ25505

I have my solar cell connected to BQ25505 according to the datasheet simplified schematic below. This is a permanent connection in my system and I can not change it unless I break into my module. The battery is external to my system though and I can remove it.

Once the whole system is mounted I have externally access to VIN_DC pin that I want to use to characterize my solar cell by an I-V trace sweep. 

What is the input impedance of the LBOOST and VIN_DC pins when BQ25505 is disabled (rechargeable battery removed)? I want to remove the impact from input impedance of BQ25505 and inductor capacitor cnnected to VIN_DC pin so that my I-V trace for characterization of solar cell is valid. 


  • Hi Kaveh,

    Unfortunately, I don't have that information.  But, with a BQ25570EVM, which uses the same boost converter as BQ25505, you can measure the input impedance with a DMM set for resistance after removing the input capacitor and inductor.