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TLV740P: short circuit limiter

Stefan Lintner
Expert 4665 points
Part Number: TLV740P

Hi Team,

a customer would like to confirm the following:

TLV74033PDQNR: they would like to use the 3.3V output version and we will use it with input voltages below 3.3V so to have an output voltage following the input with a difference of the dropout voltage:  Vout  = Vin-Vdropout.

Could you please verify if this is possible ?

The goal is to protect a power section from overvoltage (max 3,3V)and overcurrent (about  50mA).
Vin min is 2.5V.

BR,
Stefan

  • 0
    TI__Mastermind 18466 points

    Hey Stefan, 

    We recommend against doing this as this is not the intended use for an LDO. 

    We recommend using the 2.8V voltage option instead and scaling the output/input capacitors to your application to mitigate overshoots. 

    Best,

    Juliette

  • 0 in reply to Juliette
    TI__Expert 4665 points

    Hi Juliette,

    thank you for the info!

    Unfortunately customer cannot use the solution you are proposing because they need a voltage range 2.5V to 3.3V

     

    Is there maybe a specific LDO that allow it´s use in the dropout mode ?

    Customer found following component which seems to be deigned to work also in the dropout mode:

    https://www.nisshinbo-microdevices.co.jp/en/pdf/datasheet/rp118-ea.pdf

    BR,
    Stefan

  • 0 in reply to Stefan Lintner
    TI__Mastermind 18466 points

    Hey Stefan, 

    I'm not sure where it says in the datasheet where the device is operational in dropout. 

    Typically linear regulators track the input when they are in dropout and (in the most basic form) work as a resistor.

    You can use an LDO in whichever application, but if it is used outside the recommended operating conditions - we cannot guarantee the performance in the EC table. 

    If the customer wishes to use an LDO in this way, it is up to them to decide if the implementation is worth the risk to their system.  

    I'm not sure what the application is but (if there is separate rails) I would recommend looking into separate LDOs with fixed output options, a singular LDO with an adjustable configuration, or a resistor divider. 

    Best,

    Juliette