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BQ24298: Can I connect my system power on VBAT and NC VSYS?

SEN LIN
Prodigy 70 points
Part Number: BQ24298

Hi,

Because my system may sink around 6A which may be too high to BQ24298's BATFET.

My question is, can I connect my system's power on VBAT and NC VSYS? 

The battery is also attached on VBAT at the same time.

Brs/Sen

  • 0
    TI__Mastermind 26515 points

    Hello, 

    The converter on this device is designed to handle 3A maximum between BAT and SYS as stated on the first page of the datasheet. It is not designed to support a load that will draw 6A. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Prodigy 70 points

    Hi,

    Actually, the capability of BQ24298 is not a problem, sorry to make you confuse.

    I understand BQ24298 can't handle 6A, so my design will connect both battery and my system to VBAT instead of connecting battery to VBAT and my system to VSYS. 

    So, my question is, can I connect system load on VBAT instead of VSYS? Leave VSYS null?

    Thx.

    Brs/Sen

  • +1 in reply to SEN LIN
    TI__Mastermind 26515 points

    Hi Sen,

    It is not recommended to connect system load to BAT pin. 

    When the device is in pre-charge or fast charge phase the BQ24298 regulates current to BAT based on the IPRECHARGE and ICHG register settings. The max ICHG setting is 3A, therefore the device will not provide any more current than 3A to BAT pin. That will not be adequate to power your system load which may sink 6A. Also if system load is connected at BAT pin the device will not be able to know when to terminate charge of the battery. 

    Best Regards,

    Garrett