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Original question:

TPS65217: What kind of battery can be used?

TPS65217: What battery charger should we use?

Petr Mlynar
Intellectual 615 points
Part Number: TPS65217
Other Parts Discussed in Thread: AM3358, , TPS65218D0, BQ25910, BQ25792, BQ25616

Hi,

we have a custom board with AM3358 and TPS65217D PMIC. On our board we will integrate Lipol battery at 8000mAh capacity. We noticed that charger functionality of PMIC is kind of limited.

We need following functionality:

1. Monitor fuel gauge of our battery -> we will use BQ27220 as it was proposed in other question https://e2e.ti.com/support/power-management/f/196/t/970510

2. Charge battery via USB, charge it even when board is shutdown. (Keeping pb_in button for 8 secodns) -> From the TRM of PMIC we understood when pb_in is held for 8 seconds, the chip goes to off state and charging is turned off.

3. Control LED with charging status. Charging ON -> LED on, charging off or battery full -> LED off.  This is not easily achievable with PMIC as there is no status pin. The LED must be controlled via HW as the board can be turned off.

We looked for external charger IC. It seems that it would solve our issues and provides even higher charging current e.g. 3A as a USB standard.

Am I correct that for our purpose PMIC charger is not suitable and we should really go with some external charger IC?

What charger would you recommend us to use, if we have single cell lipol battery?

Is there an option to use one IC with charger and fuel gauge integrated inside?

Should the power management path be solved in external charger IC or still in PMIC?

Thanks for any hints.

  • 0
    TI__Mastermind 30310 points

    Petr,

    Yes, I would recommend looking at external battery chargers from TI. I will re-assign this question to the Battery chargers team for a part recommendation.

    Additionally, you might consider using TPS65218D0 with an external battery charger. It does not make sense to keep using TPS65217 if you are not using the integrated charger or WLED driver.

  • 0 in reply to Brian Berner
    TI__Guru**** 167136 points

    HI Petr,

    From legacy USB 5V and 3A, all chargers are limited to slightly less than 3A charge current of a1S Lithium battery.  So, your 8Ahr battery will require over 3 hours to fully charge.

    Our highest efficiency and therefore highest charge current charger is the BQ25910 parallel charger.  It is designed to be used in parallel with another charger like inside PMIC.  As such, it can't perform precharge or low current termination.  It requires I2C host control to enable charge but does not have the status pin that you requested.

    The next option would be the BQ25792 buck boost charger.  It is slightly less efficient than the BQ25910, requires I2C control, can be configured to charge in default mode at 2A even without host control and has a STAT pin.

    Another option if you don't want I2C host control would be the BQ25616 standalone charger with resistors to set charge current and STAT pin

    Regards,

    Jeff 

  • 0 in reply to Jeff F
    Intellectual 615 points

    Hi Brian,

    we use beaglecore module which has the PMIC TPS65217D integrated inside. We cannot replace it.

    Hi Jeff,

    for us the highest priority is the ability to charge without host and have LED under control via STAT pin, therefore BQ25910 is out of scope.

    Charging time is not he priority as 3 or 4 hours of charging is fine for us.

    I will check the proposed chargers.

    Nevertheless thanks for the confirmation that we must use external charger IC.

    Thanks.