" Help needed- 4.2V@1.5A form 3.7V Li Ion battery "

Thread Starter

mishra87

Joined Jan 17, 2016
1,034
Could anybody recommend me a device/chip under below specifications-

Input- 3.7V/1450mAh Li Ion Battery
Input Voltage range - 3-4.2V
output- 4.2V @1.5A

I need a step up (boost) converter under above spec.
 

Thread Starter

mishra87

Joined Jan 17, 2016
1,034

GopherT

Joined Nov 23, 2012
8,009
That does not ship to India.

With the above supply i want to drive a stepper motor.

Means if the if input voltage of battery is 3.3V , the output should be 4.2V for stepper motor driver which drives stepper motor .
Because at lower voltage the the performance of of the motor degrade. and there is some audible sound.
Stepper motors will whine in normal operation (like a transformer) because of the rapid charge and discharge of the coils in the motor. The iron actually changes shape under a magnetic field - google magnetostriction and other resonances of the system. (See "coil noise").

Here, a very creative person has some fun with the noise made by stepper motors - and controls the noise perfectly.

 

crutschow

Joined Mar 14, 2008
34,281
Note that your battery current will go up in proportion to the step up voltage divided by the boost converter efficiency.
Thus for a 90% efficiency boost converter form 3.7V to 4.2V @ 1.5A output, the battery current will be (4.2/3.7) /0.9 * 1.5 = 1.89A.
 
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