Hello all,
I have some products that I'm troubleshooting and there seems to be a defect present in the BQ24075 chips.
The company claims it is a defective batch from TI, however, several products containing TI chips from different batches present this defect.
Unfortunately i cannot share the electric scheme but it is a low power BLE device.
I don't think it is an issue with the circuit as several devices behave correctly and, for the defective devices, when i change the BQ chip they begin working correctly.
The defect basically presents as odd behaviour on VBAT where in battery search mode the device oscillates between wrong levels of voltage and when i attach a battery it does not begin the charge.
Below I post some screenshot of VBAT taken with an oscilloscope.
1) Behaviour of functioning chip when attaching a battery:
Behaviour of defective chips:
1)
2)
3)
When i attach a battery they do not recognize it and VBAT remains at the voltage of the battery with no charge happening.
These chips all come from different batches, i report chip markings here in case they can help:
NXK TI 118 ALJL
NXK TI 098 A9XR
NXK TI 188 A53R
Does anyone have an idea what the issue could be? It seems unlikely that so many batches of TI chips are bad. Could it be improper handling/storage?
Thank you very much!
