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LM117QML-SP: Current capability

Part Number: LM117QML-SP

Our customer requires an instantaneous output of about 2.1A for about 1e-4 seconds. Will the LDO be able to sustain such load without suffering any long term damage?

  • Hi Abhishek, 

    Unfortunately, since the output spike you describe falls above of the specified maximum load of 1.5A (for the TO-3 (K) package option), we can’t guarantee how the device may behave or if it would accumulate any damage. Another thing to keep in mind is that there is also a chance the current limit may limit the load to less than 2.1A depending on the device temperature (Tj) and Input-Output Differential.



  • I figured as such. Thanks for the prompt reply. Also, does the current limiting process then allow the package to be damaged for such output spikes?

  • Hi Abhishek, 

    The current limit helps prevent damage to the device by limiting the amount of power that the device dissipates, and therefore limiting how much it heats up. 

    Note 2 below the Absolute Maximum Ratings table in the datasheet provides an equation that shows the relationship between the maximum power dissipation and the maximum junction temperature rating for the device. Limiting the current helps to avoid scenarios where the power dissipation and junction temperature ratings would otherwise be exceeded.

    Hope this helps,