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'[EE] N1IF alias HX4002B alias 1.8V-5V to 3.3V DC S'
2017\12\01@064358 by Massimo Gaggero

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Hi all,
       looking for a cheap and easy to use DC Step-Down Step-Up Converter to 3.3V, I found this:

https://www.banggood.com/3Pcs-Mini-2-in-1-DC-Step-Down-Step-Up-Converter-1_8V-5V-to-3_3V-Power-For-Arduino-p-1205021.html that fits very well to my project.

But searching for more details about the IC, the only clue is the silkscreen 'N1IF', from which I cannot trace back to a datasheet. Googling around I found this ad

https://www.yoycart.com/Product/542865822576/

claiming the 'N1IF' IC to be a "hx4002b" charge pump. But again, no datasheet for "hx4002b" charge pump.

Does anybody of you have seen or used this before?

Thanks,
       Massimo.
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2017\12\01@113542 by mail

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Massimo Gaggero <spam_OUTmassimo.gaggeroTakeThisOuTspamgmail.com> wrote:
> Hi all,
>        looking for a cheap and easy to use DC Step-Down Step-Up Converter to  
> 3.3V, I found this:
>
> www.banggood.com/3Pcs-Mini-2-in-1-DC-Step-Down-Step-Up-Converter-1_8V-5V-to-3_3V-Power-For-Arduino-p-1205021.html
> that fits very well to my project.
>
> But searching for more details about the IC, the only clue is the
> silkscreen 'N1IF', from which I cannot trace back to a datasheet.
> Googling around I found this ad
>
> https://www.yoycart.com/Product/542865822576/
>
> claiming the 'N1IF' IC to be a "hx4002b" charge pump. But again, no
> datasheet for "hx4002b" charge pump.
>
> Does anybody of you have seen or used this before?

   The "b" may be only a tolerance suffix appended to a "hx4002" part.
Did you see the hx4002 datasheet shown below? The recommended layout
shown on page 9 of that datasheet seems at least superficially identical
to the banggood image.

url=http://www.hxsemi.com/upfiles/20141031121620.pdf

Thank you,

-- Don Kuenz, KB7RPU

Genius is nothing but a greater aptitude for patience. - de Buffon

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2017\12\01@115553 by Massimo Gaggero

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Il 01/12/17 16:30, .....mailKILLspamspam@spam@crcomp.net ha scritto:
{Quote hidden}

Yes, I have already checked the datasheet above, but what it says in the Features outline is "Fixed 5V±4% Output". From this, the two:
1) to obtain a 3.3 fixed output voltage a specific circuit is required (but I couldn't find anything about in the datasheet);
2) the IC for the 3.3 V output has another part number, though from the same family.

Thanks,
       Massimo.
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