LM3410: Maximum continuous output current

Arek,

If you calculate the average input current at your conditions, then you will see that you need to supply 2.4A continuously to meet that conversion ratio 5V to 12V at a 1A load.  If you consider losses in the converter, that number is even higher.  For instance, if the converter 90% efficient, you would need 10% more current at the input, so the average would be closer to 2.64A.  Then, considering it is a switching converter there will be a ripple current causing the peak to be some percentage higher than that (maybe 3A peak current).  Looking at the EC table of the datasheet on page 5, we can see that the current limit minimum value for the switch is 2.1A.  The switch will see the exact peak current through the inductor which we know will be higher than 2.1A.  Therefore, you definitely cannot use this device for this application at 1A.

-JP