Other Parts Discussed in Thread: BQ25628E
Tool/software:
We are looking to use the bq25505 in a power pack design. The primary reason for choosing the bq25505 is its ability to charge from a very low current input source (solar cell equivalent), and its relatively low start-up/enable voltage of 1.8V, and its ability to remain enabled when Vin drops below 1.8V after being enabled.
We expect infrequent discharge activity from the secondary battery that will be charged by the bq25505, and very steady daytime access to charging energy, albeit at a low input voltage and current (typically no more than 600mA and ~2.5V. We are charging a dual/parallel 18650 battery pack.
The primary question is, since the charge/discharge path to the 18650 secondary battery is through the bq25505, can the bq25505 handle the 1C discharge rating of a 3600mAh 18650 battery (derated to 3A through the operational voltage range of the 18650 battery of 3V..4.2V)? I did not find a specification for this in the datasheet of the bq25505, perhaps I missed it. In any case, even if the IC CAN support this, are there specific layout guidelines to mitigate any heat-related performance issues?
