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On the datasheet says minimum Upper Switch Current Limit at minimum duty cycle is 4.0A (min) 5.8A (typ).

How can i calculate the maximum output current? It will be higher or lower than 3A?

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2 Answers 2

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Datasheet 1st page says

3A Continuous Output Current
4A Peak Output Current

The peak current is usually limited by choice of L and IC heat loss and is exceeded by upper switch max current capacity.

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  • \$\begingroup\$ 4A peak putput current can not be prolonged? \$\endgroup\$
    – Bruk
    Commented Sep 13, 2016 at 6:33
  • \$\begingroup\$ NO compute thermal junction rise \$\endgroup\$
    – D.A.S.
    Commented Sep 13, 2016 at 6:39
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In theory you could get 4-A output current, assuming very large heatsink pad and inductance enough large to minimize current ripple. But maximum duty cycle is 90 %, so there will be also switching at 340 kHz and total losses will probably overheat the poor IC. Nobody uses components at their maximum ratings, even if it would work.

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