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BQ24610: Hot Plug and Reverse Polarity protection

Mohammed Althaf
Prodigy 20 points
Part Number: BQ24610

Tool/software:

Hi team,

I am using BQ24610RGER charger IC for our project, we need to hot plug the battery while installing the product or replacing the battery. When we try to connect the battery, we observe some spark is coming from the connector and battery leads.

kindly suggest some solution for Hot-plug protection solution and Reverse polarity protection circuit to help suppress or eliminate voltage spikes and ensure safe battery connection during hot-plug events.

We are using lead acid battery(12V, 1.5Ah).

/cfs-file/__key/communityserver-discussions-components-files/196/BATT_5F00_CHG.pdf

  • 0
    TI__Mastermind 31946 points

    Hello Mohammed,

    The simplest method for reverse polarity is using keyed hardware connectors to ensure it is physically impossible to connect in reverse. 

    If current is only flowing in one direction, i.e. input to a charger IC that will not be used in battery only mode, a FET can be used as explained at https://www.ti.com/lit/an/slva139/slva139.pdf.

    If current is flowing in both directions, e.g. a battery getting charged then discharged, protection circuits get more complicated.  Unfortunately, we do not have a good circuit based solution for this.

    Generally eFuses are placed at the load side in the applications where hot-plugging is involved. 

    During hot-plug, we expect transients to generate in the power path which can cause damage to the eFuse or your load. To prevent this, we highly recommend use of TVS diodes to clamp these transients below the abs max of the device. I recommend posting a new question related towards Efuses.

    Regards,

    Christian