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LTC4013 - can it also power a load?

Category: Hardware
Product Number: LTC4013

Hello Folks,

I have a LTC4013 battery charger circuit designed and built and seems to be running fine.  I have a 8S4P LiFePO4 battery pack that I am charging at 11A.  Can I connect a load to the charger output while the battery is being charged?  I'd like to be able to tell the end user that they can connect their equipment to our device and use up to the 11A.  Is that advisable?

If I remove the TMR cap and ground the pin the charger shouldn't turn off right?  If there is no extra load and the battery is fully charged, the CV mode should go to zero charge current.

Here is our circuit:

PDF

Thanks,

Richard

Parents
  • Hi Richard,

    Apologies for late response. If the IC is configured for 2 stage charging, it’s correct that the charger will not turn off by grounding the TMR pin.

    If the IC is configured for Li-Ion charging and TMR pin is grounded, the charger will still terminate when charge current drops to C/10. Note that to the IC, the load current is considered as charging current. If a load current higher than C/10 is always there, then the charging won’t be terminated.

    Chargers usually have slow transient response because battery voltage/current won’t have sudden changes during charging. But regular load can have fast transients (step up/down). The control loop transient response should be checked if the charger will support regular load.

Reply
  • Hi Richard,

    Apologies for late response. If the IC is configured for 2 stage charging, it’s correct that the charger will not turn off by grounding the TMR pin.

    If the IC is configured for Li-Ion charging and TMR pin is grounded, the charger will still terminate when charge current drops to C/10. Note that to the IC, the load current is considered as charging current. If a load current higher than C/10 is always there, then the charging won’t be terminated.

    Chargers usually have slow transient response because battery voltage/current won’t have sudden changes during charging. But regular load can have fast transients (step up/down). The control loop transient response should be checked if the charger will support regular load.

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