BQ34110: BQ34110 Reverse battery protection

Dilip Namdeo Mohol

Intellectual 1980 points

Part Number: BQ34110

Does BQ34110 has reverse battery protection. ?

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

Hi Dilip,

No, it doesn't.

0 Dilip Namdeo Mohol over 6 years ago in reply to Batt

TI__Intellectual 1980 points

Batt,

Can I use diode in series with IC Gnd ( Anode to IC GND pin and cathode to system GND) to protect IC from rev voltage. If yes. does it affect device performance as IC GND level is shifted by diode drop.

Regards

Dilip

0 Batt over 6 years ago in reply to Dilip Namdeo Mohol

TI__Mastermind 42535 points

Hi Dilip,

No, that will not work. The bq34110 depends on an accurate reading between PGND and GND, A 0.7V shift would be too high.

0 Dilip Namdeo Mohol over 6 years ago

TI__Intellectual 1980 points

Batt,

It is not clear from your reply which Que you answered ?

Que1) Can I use diode in series with IC Gnd ( Anode to IC GND pin and cathode to system GND) to protect IC from rev voltage.

Que2) If yes. does it affect device performance as IC GND level is shifted by diode drop.

0 Jason Haedt over 6 years ago in reply to Dilip Namdeo Mohol

TI__Expert 4600 points

Batt,

Adding to this thread, what is the best way to do reverse battery protection with the BQ34110?

I see adding a load switch controlled by another dedicated microcontroller as one option but wanted to see if Dilip's method of a diode or ideal diode (20mV) forward voltage drop could be used?

Appreciate your feedback,

Jason

0 Batt over 6 years ago in reply to Jason Haedt

TI__Mastermind 42535 points

Hi Jason,

You are better off using a switch. A drop across the diode is too high and we depend on the shift between GND and PGND to be small. So, do not use a diode.

0 Dilip Namdeo Mohol over 6 years ago in reply to Batt

TI__Intellectual 1980 points

Thanks

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BQ34110: BQ34110 Reverse battery protection