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Original question:

TPS25750: external MCU requirement on BQ25731 scenario

BQ25792: max power limitation

Serkan Erboral
Prodigy 20 points
Part Number: BQ25792

Hi Team

Usage of BQ25792 is not recommended for applications above 45W. Does this limit comes from the internal mosfets of buck boost converter? Sourcing a 45W system means the possibility of doubling the input current as it is the sum of the charging power and system power so a power requirement of 90W on the Buck boost converter. If the system works only with battery power (I mean no charging simultaneously) then using BQ25792 over 45W scenarios is also possible, right?

Max continues discharge current is given as 6A, is this still valid for 4s battery when there is no simultanous charging nor input source available?

I couldn't find rds (on) resistance value for the fet from BAT to VSYS. I need it for thermal calculations while discharging.

Thank you in advance.

  • +1
    TI__Guru**** 167196 points

    Hi Serkan,

    The max input current limit is 3.25A and with a 24V input source, it is theoretical possible.  However, the IC package gets too hot and forces the converter into thermal regulation, which reduces input current, to prevent damage.

    Max discharge current is 6A when no charging or input source is availble.

    The Rds of the BATFET is below:

    Regards,

    Jeff