LM2611 contradictory Junction-to-ambient thermal resistance specification

Peter Krammer

Hi,

the datasheet in the Absolute Maximum ratings for RθJA specifies 163.5 °C/W, but on page 10 in chapter 7.3.3 Switch Current Limit you can find a different spec θJA = 265°C/W.

It is a major difference. Which one is correct?

Best Regards

Peter

over 8 years ago

0 Robert Blattner over 8 years ago

TI__Expert 6245 points

Hello Peter,

Since the time this datasheet was first written, the procedure for establishing thermal resistance has been standardized company wide. Using the new system, 163.5 C/W is the correct number. This thermal resistance corresponds to a part soldered onto a PCB. The higher 265 C/W number is for a free floating part, a non-physical situation in which a device is suspended by fine wires. We will update the datasheet.

Regards, Robert

0 Peter Krammer over 8 years ago in reply to Robert Blattner

Prodigy 60 points

Thank you Robert for the quick response.

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LM2611 contradictory Junction-to-ambient thermal resistance specification