Let's Make Robots!

5v Step Up question



Does anyone have experience with this type/brand of step up 5v converter? I'm comparing it to the Pololu one here: http://www.pololu.com/catalog/product/798 which is slightly more expensive, and then you get hit with shipping costs (for me it's about the same price as buying a second module).



Pololu 5v step up ($5.45 + SHIPPING)

-0.8 to 5v input @ 2.5% accuracy

-8.4 x 12.7 x 3.8 mm (0.33" x 0.50" x 0.15") small size

-40mV ripple peak @ low voltage (150mV at 5v input)

-200mA output

-Comes with male headers (straight and angle)



No-name eBay brand ($4.74 + FREE SHIPPING) 

-0.9 to 5v input @ unknown accuracy

-25 x 18.5 x 5.5 mm - bigger size

-50mV ripple peak max(!)

-1000mA output(!)



Any thoughts?

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I think the E-bay module is worth checking out if you do not mind the wait because of the higher current output.

It would help if they told you the part number of the control IC. Ask them for the part number or a datasheet. Then you could get a lot more information about it for comparison. Chances are the PCB is simply the sample circuit shown in the datasheet.

Yea I'm going to email them for the specs, if they have it.

On a related question, do you know if I would need a >1000mAh battery, or would say, a 3.7v 750mAh lipo work with these step ups?

That depends how much power your robot will use and how long you want it to run between charges. It has nothing to do with the maximum current output of the DC-DC converter.


I'm guessing that the "no name" board ships from Shenzhen or Guandong-amiright? By the time the other board got to you, you'd have lost interest! At the slight difference in cost and higher level of customer care that you'll get from Polulu on top of the quicker ship, I'd think it would be worth it.  There's also this one:


See if it works for your spec.  I get the HIGHEST level of customer service from Sparkfun domestically.  Not that they're necessarily better than Trossen/Polulu/Solarbotics/JakTek/RBS/etc.  Just that they impressed me recently.

Yea I see your point. I've been waiting for a big shipment from dealextreme.com and it's taking foooorrrrrrrrrrrreeeeeeeeeeveeeeeeeeeeerrrrrrr.

But cost is very important for the project. I basically HAVE to go lipo for the size of the bot I'm working on, but the MCU/servos/sensor will be needing 5v.