Other Parts Discussed in Thread: BQ25100,
Hello.
I am working on a circuit that uses a BQ51003 IC as a Qi receiver, to then charge a Li-Po battery. The battery charger we're using is the BQ25100.
The issue we're having, is that the system is heating up quite a bit when the IC is in use.
When charging through USB, the system reaches 30 deg C, which is acceptable.
When charging through Qi (with only the coil on top of the charger, to avoid heat transfer through contact with the charger) the system reaches 40 deg C which is no longer satisfies the requirements.
If we then place the full system on top of the charger (as in normal operation), then the temperatures sky rocket, reaching 50+ deg C.
The ambient temperature is around 24 deg C.
The result of this is that we are observing severe damage to the batteries when wireless charging is used, but not when USB charging is used.
The battery charging IC and current/voltage parameters used are the same independently of the power source.
This points to a heat related problem.
The question would be what can be causing this increase in temperature? Is a 10deg C increase in temperature expected?
Does the configuration of ILim affect the power transmitted by the wireless TX, or does it only transmit enough power to match the current need?
We have checked the FOD calibration which seems to be fine, the was no excessive power loss reported by the charger/receiver.
Thank you in advance for your time and assistance.
