To drive any unipolar stepper motor you need to consider the following. In case you are not lucky enough to have the current rating and you only have resistance of any one phase then you can calculate the current rating by using the relationship mention below. This way of calculating the current rating may not give the entire details like stalling current etc. Below are the steps to analyze the driver IC data sheet. See whether the required ratings fall well below the absolute maximum ratings voltage ,load current of the IC. Understand weather it meets you frequency requirements speed at which you would like to drive the stepper motor.
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