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BQ24610: BQ24610

Shafeeq Muhammed
Expert 1210 points
Part Number: BQ24610


Hi,

Can we use the BQ24610 charger circuit without the P-Channel back to back Mosfets?

We are having separate reverse voltage protection (N channel back to back Mosfet associated with other protection IC)  in our design. So again do we have to use back to back Mosfets with the charger.

Please suggest.

Thanks & Regards,
Shafeeq

  • 0
    TI__Mastermind 24075 points

    Hi Shafeeq,

       No, you do not have to include them if you have separate reverse voltage protection. You can leave ACDRV floating.

  • 0 in reply to Kedar Manishankar
    Expert 1210 points

    Hi Kedar,

    Thanks for your reply.

    For Power MOSFET, that you have suggested Sis412DN in your datasheet.

    For my application, maximum charge current will be 2A (Peak) and input max 24V.
    Can you suggest any MOSFETs which will meet the above requirement in smaller package.

    Sorry, I am not able to make out the recommended specs for the MOSFETs.
    I know I have to consider 40V rated FETs. But there are equations to calculate FOM and losses. But I didn't find any recommended  FOM or loss values.

    It will be very helpful if you can suggest any other MOSFETs.

    Also please let me if there is any recommendation to select BATFET.

    Regards,
    Shafeeq

  • 0 in reply to Shafeeq Muhammed
    TI__Mastermind 24075 points

    Hi Shafeeq,

        We have another power switches team that can answer your questions more accurately. Once you find a relevant part, please create a new post with that part number tagged and that expert can reach out to you.

    Generally when choosing switching MOSFET you want 40V rated FET with lower RDSon to decrease conduction losses and lower Qg to decrease switching losses. As the BATFET doesn't switch at high frequency the switching loss is less important and lower RDSon is good to reduce power dissipation when BAT supplies SYS. 

  • 0 in reply to Kedar Manishankar
    Expert 1210 points

    Hi Kedar,

    There is no selection recommendation  for Bootstrap Schottky diode on the datasheet.

    Is there any information you can provide on how to select this Schottky diode.

    In datasheet you recommended BAT54, But we would like to use smaller packages with two pin.

    Can you please suggest any series MOSFETs which can be used with BQ24610?
    If I have to select one part, I will need to know what is the Acceptable FOM, switching and conduction losses. Can you please suggest acceptable ranges for these?

    Thanks & Regards,
    Shafeeq

  • 0 in reply to Shafeeq Muhammed
    TI__Mastermind 24075 points

    Hi Shafeeq,

        You can use a smaller package, however keep in mind the forward current rating of the schottky diode you use, as well as select one with low reverse recovery loss. Select one that has a similar forward current rating to the EVM.

       As this is a controller, the designer has choice of external components. Section 10.2.1.2 Detailed Design Procedure describes in detail how to select external components based on your power budget, as well as your operating conditions and is a helpful resource to use.