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LM25119: Suitability of the part as replacement for LM5119 in a circuit with Max Vin 30V

Russell Inger
Prodigy 20 points
Part Number: LM25119
Other Parts Discussed in Thread: LM5117, LM5119, LM25117,

We have been using the LM5119 and also a LM5117 on  our products.

We find it easier to obtain the LM25119 and LM25117 parts at present.

The boards are nominally 24VDC.

The higher voltage Vin Max of the original part is not really required.

The parts seem to be a suitable drop in replacement.

It appears the only differences between the LM25119 & LM5119 are the VCC regulation conditions and the Undervoltage threshold, and just the Undervoltage threshold on the LM5117 & Lm25117.

So this should only affect the device during initial power up as there will be a marginal difference in the time before the outputs are enabled, as Vin ramps up.

Also under fault conditions a slight difference at what point  the ULVO takes effect.

Are this statements correct ?

  • 0
    TI__Guru 62110 points

    Hi 

    Can you provide the detail input/output case? LM25119 has different input and output voltage. 

    We want to make sure it can be replacement without BOM changes.

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 20 points

    Hello,

    These are the operating conditions of the parts we are using at present, which we  wish to replace with the LM2511X versions.

    LM5119

    Max Vin = 26V

    Vout 1 = 5V @ 3A (max)

    Vout 2 = 3.3V @ 7.5A (max

    LM5117

    Max Vin = 28.28V

    Vout = 12V on 1 product , 24.8V in another product.

    thanks,

    Russell

  • +1 in reply to Russell Inger
    TI__Mastermind 27280 points

    Hello,

    Your statement is right for the LM25119 and LM5119 replacement. For this application, LM25119 can replace the LM5119 with no BOM change.

    The statement is right as well for the LM21117 and LM5117 replacement.

    Regards