BQ40Z50: Max anticipated current flow through BAT pin 32

Joseph DeWitt

Part Number: BQ40Z50

Hi,

Could you please advise as to the max anticipated current flow (mA) through the BAT pin 32? There is blocking diode (D1) connected to pin which I need to protect for thermal compliance given that our application is intrinsically safe. I therefore need to install a fuse upstream of the blocking diode to control the thermal rise of the diode. I don't want to set the fuse too low to wear it blows due to the normal current consumption of the BQ40Z50 IC.

Would it be safe to install a 50 mA fuse on the BAT pin track and not disrupt the normal current consumption of the IC? Or would it be better to install a 100 mA fuse to avoid any operational issues?

Any guidance you can provide would be greatly appreciated.

Best regards

Joe DeWitt

over 2 years ago

0 Jose Couso over 2 years ago

TI__Mastermind 27321 points

Hello,

Your question has been received. Please allow two businesses days for a reply.

Regards,
Jose Couso

+1 Jose Couso over 2 years ago

TI__Mastermind 27321 points

Hello Joe DeWitt,

Typical current consumption of the device is in the 300uA range. I think either 50mA or 100mA fuse will be fine.

You can place a 1kOhm resistor at BAT pin and check the current consumption to double check if needed.

Regards,
Jose Couso

0 Joseph DeWitt over 2 years ago in reply to Jose Couso

Intellectual 320 points

Hi Jose,

Thanks so much for the feedback. Really appreciate the support and guidance regarding the acceptable fuse rating.

Best regards,

Joe DeWitt

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BQ40Z50: Max anticipated current flow through BAT pin 32