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TPS2660: TPS2660 used in battery charger application

Asael Espinoza
Prodigy 245 points
Part Number: TPS2660

Hi TI team.

The board I am designing requires as one of its functions conduct power from a battery charger to a Li-Ion battery 10s (42 V max) and/or 13s (54.6 V max) charging at 2A. 

I required the following protections:

* Transient voltage protection.

* Short circuit protection.

* Inrush current protection & Inrush current limit.

* Reverse polarity protection.

For the transient voltage protection, I will use a TVS but for rest of the protection to not use a discrete solution the TPS26600 or TPS26601 seems a good option.

My question is, can I use this efuse having that battery as load?

Thanks in advance for the reply.

  • 0
    Prodigy 245 points

    To complement my question. 

    Below is an explanation of what we need.

    As you can see in the image above, the main power source is the external battery. External battery should be always connected and must power the internal system as soon as is connected (this is in case internal single cell Li-Ion is not present).

    External battery charger must power the internal system as soon as is connected (this is in case internal single cell Li-Ion is not present) and must charge the external battery.

    We need the following: 

    1. If the external battery charger is not connected which will be most of the time, we must not have voltage in connector 2.

    2. If there is an issue with the external battery charger when is connected (short circuit, overcurrent, transient voltage & current, reverse polarity), system should be able to cut that connection because the external battery should be able to keep powering the internal system (this in case internal single cell Li-Ion is not present).

    To cover point 1 and point 2 and to use an integrated solution, the TPS26600 or TPS26601 seems a good option. See image below. If this is not possible, please let me know your comments and recommendations.

    Note: TPS26600 or TPS26601 must be able to handle inrush current at the initial moment the battery charge begins. 

    3. This is a rare case but if the external battery is not connected and the external battery charger connected, we should not have voltage in connector 1. 

    To cover point 3, one option is using a second efuse but I don't want to overprotect the system. I will appreciate any suggestions you can give me.

    Thanks.

  • 0 in reply to Asael Espinoza
    TI__Guru 56860 points

    Hi Asael,

     Thanks for reaching out! I will get back by tomorrow on this.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Guru 56860 points

    Hi Asael,

    You can use TPS2660x for features you need. 

    Regards 

    Kunal Goel

  • 0 in reply to Kunal Goel
    Prodigy 245 points

    Thanks for the reply, Kunal.

    Do you consider better use 2 efuses, one in connector 1 side and one in connector 2 side, or only use an efuse close to the connector 2 and an ideal diode with external MOSFET in the connector 1?

    Regards.

  • +1 in reply to Asael Espinoza
    TI__Guru 56860 points

    Hi Isael,

    In connector 2 you need bidirectional eFuse because current should flow from charger to battery and battery to downstream load also? TPS2660 blocks reverse current so may not be used for connector 2.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    Prodigy 245 points

    I am a little bit confused, you mentioned that TPS2660x may not be used for connector 2 but seeing the image, I supposed you meant that not be used for connector 1, is that correct?

  • +1 in reply to Asael Espinoza
    TI__Guru 56860 points

    Sorry . I meant connector 1.

    Regards

    Kunal Goel