BQ40Z50-R2: Separate the CHG and DSG MOSFET

Statham Su

Genius 4990 points

Part Number: BQ40Z50-R2

Hello Sir:

Can we use the BQ40z50-R2 for separated CHG and DSG MOSFET application?

Can we refer the SLUA952 or SLVA729A to do?

Please provide the recommendations for us.

Thanks a lot.

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105760 points

Hello Statham,

I'm not sure what you mean for separated, one of the documents refers to parallel FETs and the other is using 2 paths, one for CHG and one for DSG.

You should be able to use these documents for references to accomplish what you need.

Sincerely,

Wyatt Keller

0 Statham Su over 4 years ago in reply to Wyatt Keller

Genius 4990 points

Hi Keller:

Thanks a lot your feedback.

I draw the function block as below.

We want to know that if we use this topology on BQ40z50-R2, does it has side effect or not?

Is there anything we need to pay attention to?

Please provide your recommendations for us.

Thank you very much.

0 Wyatt Keller over 4 years ago in reply to Statham Su

TI__Guru** 105760 points

Hello Statham,

This configuration should be fine. The guides you linked should discuss anything needed.

Sincerely,

Wyatt Keller

0 Statham Su over 4 years ago in reply to Wyatt Keller

Genius 4990 points

Hi Keller:

I search the older information from E2E.

That AE Steven told this action was not recommend.

Do you know the reason?

0 Nick Brylski over 4 years ago in reply to Statham Su

TI__Mastermind 19195 points

Hi Statham,

It is possible for both MCU and gauge to control protection FETs so something like this is possible.

Best regards,

0 Statham Su over 4 years ago in reply to Nick Brylski

Genius 4990 points

Hi Brylski:

If we separate the MOSFET can you let us know which parameters we should be setup?

Please help to provide your recommendations for us.

Thanks a lot.

Separate

0 Wyatt Keller over 4 years ago in reply to Statham Su

TI__Guru** 105760 points

Hello Statham,

Steven is correct, you would need to have more custom control on the MCU side and it can be more complex. With FET_EN = 0 the FET_TOGGLE commands can be used but then all firmware based protections would no longer be used.

We do have the PARALLEL_FETS that may be helpful to look into for your application.

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ40Z50-R2: Separate the CHG and DSG MOSFET

Separate