LM2621 Some help to make sure I'm reading the datasheet properly?

Thread Starter

tbfunk

Joined Dec 9, 2010
30
Im thinking of using the LM2621 to power a stereo from a 6V battery setup. (4 'D' Cell Carbon Zincs are what I have in mind)

The stereo is a Sirius SXMB2C and it runs on 12V as far as I can tell. From tests I have done it seems to draw between 0.7A and 1.3A during operation.

After reading the LM2621 datasheet it seems to say that the "Switch Peak Current Limit" is 2.85A.

Would using the LM2621 to power this device be a good idea? If not what am I not seeing?

Datasheet: http://www.ti.com/lit/ds/symlink/lm2621.pdf
 

djsfantasi

Joined Apr 11, 2010
6,687
If I’m reading the datasheet correctly, it wouldn’t be a good idea.

The peak current is rated for 2.85A.

But the load current (or operating current) is only rated for 1A. (See “Features” On page 1).
 

Thread Starter

tbfunk

Joined Dec 9, 2010
30
Thank you djsfantasi! I completely missed that.
It did seem like a stretch that this thing could handle almost 3 amps given that its such a small IC.
 
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