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Forum Post: Resistor current limiting on LM2734X (or any step-down regulator)

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Hi,

For regulatory issues our design requires a resistor and fuse to limit the amount of current that is able to be pulled from a small 6V SLA battery.   This can't be changed.

What I would like to know is how to go about predicting how much current the LM2734X will pull from the battery in order to achieve a 3.3V output at different load currents.

My circuit has a 2.7R and 630mA fuse (approx. 0.3R) inbetween the battery and the LM2734X.

I would like to be able to know how to predict when the LM2734X will fall out of regulation if the load current is, for example 600mA.


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