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TPS7B7702-Q1: If Vin not more than Vout, could its current capability equal to 300mA each channel?

Zirui Su
Expert 5340 points
Part Number: TPS7B7702-Q1

Hi team

I need your help to confirm that regarding TPS7B7702Q1, if the input voltage is lower than the set output voltage,
Could its the current capability reach 300mA/channel? Why I ask the question is that the customer initially use batttery-buck/boost DCDC-LDO connection while the EMC is not good, so they connect battery directly to the LDO, so there maybe a situation that the input voltage lower than the set output voltage. Therefore, if the Vin lower than Vout, could the TPS7B7702Q1 current capability reach 300mA per channel? Need your confirmation asap since the case is urgent, thank you.

  • 0
    TI__Mastermind 48765 points

    Hi Zirui,

    If the input voltage is less than the set output voltage the output will not be at its target. Instead the output will be at Vin - V_dropout and the LDO will be operating in dropout where there is no regulation and you lose the PSRR properties. You may get to 300mA output current but the voltage will not be reliable and will depend on the battery voltage. It is not recommended to use LDOs like this.

    Regards,

    Nick