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TLV758P: tlv758p thermal resistance

Sammi Shang
Expert 4450 points
Part Number: TLV758P
Other Parts Discussed in Thread: TLV755,

Dear team,

We recommend sot-23 TLV758p and TLV755 to customer. But customer wonder about the thermal resistance of those IC.

They will have 1.5W loss with 500mA load current but only last 1 second. Then repeat the short pulse after several hours. Will the LDO have some effects with the 1 second pulse? It will exceed 150 degree C.

Any other SOT23 LDO recommend for this?

Thanks.

Best regards,

Sammi

  • 0
    TI__Mastermind 43630 points

    Hi Sammi,

    Of these, the TLV758P has the best thermal performance for the SOT-23 package. This has a TJA 176.9C/W. With 1.5W of power dissipation, this is a 265.35C (1.5x176.9) rise above ambient. 

    1s is a long time for this condition and the LDO will definitely thermally shutdown. 

    There is no SOT-23 LDO that can handle this.

    A better solution might be something like the TPS73701DRB which has a TJA of 49.5C/W which would yield a 74.25C rise above ambient. 

    I hope this helps.