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TPS7A24: TPS7A2450DBVR

robin gangopadhya18
Mastermind 6296 points
Part Number: TPS7A24
Other Parts Discussed in Thread: ISO7710

I have a simple drop out regulator using TPS7A2450DBVR .

There are two with similar functions. Input is 12v nom, output is 5v.

For the moment, I have no load connected to either. Eventually, this load will be ISO7710 pin 8 for.

I have measured impedance across the output X7R 1uF cap be>meg Ohm.

But the devices get pretty hot.

Form the specs, there are only uA-level currents going in /out of the pins.

So why are they getting so hot even without any load?.. Each cannot be dissipating more than 7 time few microamps< mW at worst. With 167.8 deg C /W  Rj, one would expect no perceptible temp rise.

Am I ignoring some bias current here?

Should I use a different regulator?

-Any help will be highly appreciated.

-robin

  • 0
    TI__Mastermind 37025 points

    Hi Robin,

    These devices should not be getting any warmer than ambient temperature with absolutely no external load applied.

    Can you please provide a schematic?
    Can you capture the input and output voltages on an oscilloscope (just to check anything obviously wrong with the devices)?

    Can you confirm that the linear regulators are regulating to 5V on the output?
    Is there any power supplies or leakage currents flowing into the linear regulators by mistake?

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    Mastermind 6296 points

    Stephen

    WIll do asap.

    OIf the 2 , only 1 gets hot.  Both have same config

    I will get the data though.

    Although, in/ out are exactly what they should be. One not getting hot is 5.00 while the one getting hot is 4.99

    thnx for the support.

    robin