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From: "gene glick (geneglick AT optonline DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Wed, 21 Aug 2019 02:36:40 +0500
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Message-ID: <CAGBFkM3ERvVAzA1cyFeNKj6Bu1c4_a5u1tLdwtT=BC94_LMuNA@mail.gmail.com>
Subject: Re: [geda-user] 3V to 12V converter
To: geda-user AT delorie DOT com
Content-Type: multipart/alternative; boundary="0000000000004b3aec0590934157"
Reply-To: geda-user AT delorie DOT com

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Analog devices LT3048-12 looks close to what you want, but is limited power
output (400 mA). Maybe you could parallel some to gain required power
capability, but that goes against your fewest parts requirement.You should
contact Analog Devices for recommendations when connecting in parallel.

I'm really guessing at your needs because you didn't spec things very well.
TI has a part that might work for you.  I used their web bench to find a
part and let it design ...TPS61089RNRR
 =E2=80=91
2.7V-4.2V to 12.00V @ 1A

It's fairly small, but consumes 14 parts. They estimate the BOM cost at
around 8 bucks. There's even a layout for you, which is really amazing to
me.

SMPS design is *hard* and that's why these guys try to simplify matters.
Your required input voltage is on the low end making matters worse. You
said 3V, but what is the min? Is it 2.75? Did you mean 3.3V? Do you care
about switching frequency? Do you care about output ripple? What is the
range of output current? What about protection against short circuits? All
this matters. Finding controllers takes a while - as you are finding out.

On Wed, Aug 21, 2019 at 1:24 AM gene glick <geneglick AT optonline DOT net> wrote:

> Yes, that's right.
>
> On Tue, Aug 20, 2019 at 11:03 PM Rob Butts (r DOT butts2 AT gmail DOT com) [via
> geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>
>> I'm realizing that the AOZ1280 is a buck which can't boost voltage.  I'm
>> correct right?
>>
>

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<div dir=3D"ltr">Analog devices LT3048-12 looks close to what you want, but=
 is limited power output (400 mA). Maybe you could parallel some to gain re=
quired power capability, but that goes against your fewest parts requiremen=
t.You should contact Analog Devices for recommendations when connecting in =
parallel.<br><div><br></div><div>I&#39;m really guessing at your needs beca=
use you didn&#39;t spec things very well. TI has a part that might work for=
 you.=C2=A0 I used their web bench to find a part and let it design ...TPS6=
1089RNRR</div>=C2=A0=E2=80=91 <br>2.7V-4.2V to 12.00V @ 1A<br><div><br></di=
v><div>It&#39;s fairly small, but consumes 14 parts. They estimate the BOM =
cost at around 8 bucks. There&#39;s even a layout for you, which is really =
amazing to me.</div><div><br></div><div>SMPS design is *hard* and that&#39;=
s why these guys try to simplify matters. Your required input voltage is on=
 the low end making matters worse. You said 3V, but what is the min? Is it =
2.75? Did you mean 3.3V? Do you care about switching frequency? Do you care=
 about output ripple? What is the range of output current? What about prote=
ction against short circuits? All this matters. Finding controllers takes a=
 while - as you are finding out.</div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Aug 21, 2019 at 1:24 AM gene =
glick &lt;<a href=3D"mailto:geneglick AT optonline DOT net" target=3D"_blank">gene=
glick AT optonline DOT net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><div dir=3D"ltr">Yes, that&#39;s right. <br></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug =
20, 2019 at 11:03 PM Rob Butts (<a href=3D"mailto:r DOT butts2 AT gmail DOT com" targe=
t=3D"_blank">r DOT butts2 AT gmail DOT com</a>) [via <a href=3D"mailto:geda-user AT delor=
ie.com" target=3D"_blank">geda-user AT delorie DOT com</a>] &lt;<a href=3D"mailto:=
geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">I&#39;m realizing that the AOZ1280 is a buck which can&#39;t boost volt=
age.=C2=A0 I&#39;m correct right?</div>
</blockquote></div>
</blockquote></div>

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