Driver for stepper motor from 3.7 volts?

Question

Electronics

Hey! My task is to assemble a robot on a bipolar stepper powered by a 3.7 volt battery, I can’t find a suitable driver because they are all from 5 volts and above. the engine itself is tiny less than 1 cm (in volume :) And if you can tell me the sequence of searching for microcircuits by parameters.

Answer 1

To operate a stepper motor, you need not voltage, but current (which is indicated in the passport). If your motor is bipolar (many pins) use ULN2003, if it is unipolar (4 pins) then use A4988 or DRV8825 they regulate the current so that any voltage >8V can be applied to the input (you will have to install a boost regulator). If the motor is very small, assemble two bridges on any transistors.

Answer 2

What stepper? What is the size and weight of the robot?
Nema17 gives good power at 20V, 3A.
As for 3.7V, try the ULN2003 driver. True, this is a SD 28BYJ-48, and how much power it will give with such power is a big question.
If there is a suitable power source, the price of the experiment is less than 100 rubles.