Other Parts Discussed in Thread: BQ25180
Hi all,
How many volts does the internal system start to operate correctly?
The recommended operating conditions in the datasheet say 4.35V~. However, when I tried it, if the input voltage is above the battery voltage, it will start charging.
For example, if USB charging is set to 500mA and a 100mA USB charger is connected to the USB input and no AC input, its USB voltage will be lower (For a USB adapter with a supply capacity of 100 mA, 500 mA of charging current is a lot, causing a voltage drop). If it is less than 4.35V, will the BQ24031 not be able to control charging correctly and will have dangerous charging behavior?
I don't think so; 4.35V is the voltage needed to complete the charge, and I think the controls inside the BQ24031 are working correctly at the lower voltage.
If so, please let me know how much voltage is required at which pins for the BQ24031 to operate correctly?
If charging with a low input voltage, which I used as an example, is dangerous, then I need to detect the input voltage and not charge. Because I cannot develop a product without countermeasures with just a simple warning, putting the responsibility for that danger on the user.
Best Regards,
Yukio Oyama