Boost converter

[Pavle]

How to make boost converter that will convert 3.8 volts to 5 volts for my android?

[Audioguru]

3.8V is close to the average discharging voltage of a single Lithium ion battery cell that is 4.2V when fully charged then slowly discharges to 3.2V when it should have its load disconnected.
5V is the input to a charger circuit in a cell phone.

Do you want to make your own "power bank" that has a Lithium battery cell, a charger for it that charges from USB and a voltage boost converter circuit that regulates its output to 5V?

[Pavle]

I want want to make converter that will supply micro usb port when I connect OTG devices.

[han]

Why make if you can buy cheap USB power bank and get the circuit inside?? I can get one less the $1.5

[michaeliv]

Here is a converter for 45c shipped: http://www.aliexpress.com/item/0-9V-5V-to-5V-600MA-USB-Output-charger-step-up-Power-Module-Mini-DC-DC/32551686634.html
Not sure what you are trying to do. If you want to supply power to the OTG slave, this will most likely work. If you're trying to charge / power the OTG host then it will likely not work. It might work with a special cable.  1st reply here: http://forums.androidcentral.com/samsung-galaxy-note-10-1-2014/429487-otg-cable-supports-charging-same-time.html

[Pavle]

I want to put converter inside my android.

[michaeliv]

If you  mean your android phone, then it should provide power by default to OTG devices ( if it supports OTG ). If not, then please stop making humanoid robots, they will destroy humanity.

[Pavle]

My android supports OTG but it cannot provide power to micro usb port.

[michaeliv]

Well I can't imagine why a manufacturer would design a phone that would support OTG but does not supply any power. What phone model is it ?
Theoretically all you have to do is connect the boost  converter I linked to the internal battery, power the OTG device from the output of the boost converter, connect the data lines from the USB of OTG device to the phone and it should work.
Theoretically you might also damage your phone doing this. If you're willing to risk it, let us know how it will turn out.

[Pavle]

Samsung Galaxy S3 Neo.How to makeconverter??

[KL27x]

You can buy DC-DC converters that are already built, or salvage them from "Minty Boost" devices.

If you want to incorporate one into your own pcb, you could of course design your own. Or you can buy pre-built DC converters that come on a tiny footprint of PCB, and there are pads that you have to oven mount to your own PCB. Or you can choose from hundreds of dedicated IC's to drive a DC boost converter, providing your own pcb layout and components to finish the circuit, minimally needing an inductor, rectifier diode, input/output caps, and the feedback resistors.

I doubt you can find room to fit a DC converter into a modern smart phone, though. So unless you are ok with gluing it to the outside of the phone, I think you might be disappointed.

Take a look at some of the IC's available. If you look at the datasheet, you will find out the parts you need. If you were going to build your own from scratch, you would minimally need the same parts plus a FET to switch, plus say a microcontroller with a comparator or ADC to get feedback and to control the switching?
http://www.mouser.com/Semiconductors/Integrated-Circuits-ICs/Power-Management-ICs/Voltage-Regulators-Switching-Regulators/_/N-6j76f?P=1z0vndw&Ns=Pricing|0

[Mr Smiley]

The first thing you need to know is how much space you have to play with 

 

[Pavle]

Inside android:
http://postimg.org/image/3xc5o7rxh/
http://postimg.org/image/5az75s1t1/
What dimensions must be???

[michaeliv]

You won't be able to fit a boost converter inside a phone.
As for how to build one if you don't want to buy one that is already built (which will end up being cheaper) -- In the MT3608's datasheet you have a schematic and descriptions on how to choose the components.
https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf

[Pavle]

Can you help me to find already built boost converter that will fit inside android???

[KL27x]

michaeliv linked a very inexpensive converter in reply #4, if you can wait out the shipping.

If you have the equipment and skillpatience to deadbug something like this, perhaps you might be interested:

http://www.mouser.com/ds/2/281/LXDC44A_Series_datasheet_J-466535.pdf

[rx8pilot]

How to make boost converter that will convert 3.8 volts to 5 volts for my android?

Not to be a total jack-ass, but a question that is so generic and broad is not going to encourage those that can answer it. Do some work on your own - at least frame the question with enough detail to make it look like you are trying.

You are asking for people to provide you with a FREE service. To me it sounds like you just want someone to hand you the answer without any effort - so I will not bother typing up anything.

What have you done already?
What is your background?
How much money do you want to spend?
Is this just for fun?
What android device will it go in?
etc.....etc....etc.......

[Pavle]

I was trying to find but I cannot find converter that will fit inside android.

[Pavle]

Where can I find built converter that fill fit inside android?

[Skimask]

 

[ali6x944]

well, could u post some values for the space u have when u assemble it all together?
because from the photos u posted the only place were there is no chips or shields is the side strip of the PCB...
u would not solder the converter in there, the converter would just slide there and be wigged between the PCB and  the LCD.
i was thinking in the lines of charge pump instead of a boost but I'm not sure if it will delver enough current, or syncrones boost for high efficincy but not sure if it will fit...
see this and say what might work for u:
 http://www.digikey.com/product-detail/en/LM27313XMF%2FNOPB/LM27313XMF%2FNOPBCT-ND/1590175

[Pavle]

Do you mean this side of pcb:
http://postimg.org/image/4tkiriy6f/

[ali6x944]

yep, that's it....

[Pavle]

Free space:
Width:8mm
Length:20mm

[AmmoJammo]

I don't know of any device that doesn't output 5volts when using an OTG cable.

Both my Galaxy S6 and S5 do it, and as far as I can recall, so did the S2 I used to have.

Thats the whole point of it...

[ali6x944]

with the phone assembled?

[Pavle]

Free space:
Width:8mm
Length:20mm

[ali6x944]

oh, are u into SMD soldering?
because if u do it with the parts all of us posted u may have some problems...
give the height measure please...

[Pavle]

I think it's:
Height:2mm

[ali6x944]

great! now i wont u to search any boost converter IC  -preferably module- which has a height of 2mm or less and width of 8mm or less, for the length u have much freedom, so don't worry a lot about it gust make sure it is less than 20mm.

[Pavle]

I was trying to find now but there is no converter with that dimensions.

[AmmoJammo]

I don't know of any device that doesn't output 5volts when using an OTG cable.

Both my Galaxy S6 and S5 do it, and as far as I can recall, so did the S2 I used to have.

Thats the whole point of it...

I found an S2, that, of course, outputs 5volts when using an OTG cable as well.

Is your phone broken? are you using an actual "OTG" cable, or have you made your own that isn't even enabling the "OTG" properly?

[Chalcogenide]

The Nexus 4 did support OTG, but couldn't provide the power to any connected device, so I think that the S3 Neo is in the same boat.
Can't you just fit the boost converter in the USB cable? There's no way in hell you can fit a boost converter inside the phone.

[Pavle]

Can you tell me exactly what parts I need for boost converter???

[mikerj]

Can you tell me exactly what parts I need for boost converter???

As numerous people have already suggested(and provided links), just buy a complete converter.  It will be considerably more expensive to make your own.

[rx8pilot]

Can you tell me exactly what parts I need for boost converter???

Yes:
You will need 1 qualified and experienced electrical engineer that specializes in power conversion. Cost varies from very expensive to extremely expensive. You should be able to get a basic start for about $10k/ USD to define the problem and study it enough to make a plan. Another $20k-$30k for the time and materials needed to work out the details, prototypes, testing, and final installation. Could be less, but I would count on somewhere in that range.

[Pavle]

There is no converter with that dimensions.

[Asim]

Oh god, you must be somewhere around 14 year old or just lazy. Do some homework by yourself

[rx8pilot]

Oh god, you must be somewhere around 14 year old or just lazy. Do some homework by yourself

+1

Listen, Pavle..... do you have any intention of helping yourself? The extraordinarily broad questions are ridiculous.

[Pavle]

Is this that: http://www.aliexpress.com/item/2-pieces-lot-mini-dc-dc-converter-0-9-5V-to-5V-DC-DC-step/32268732761.html
I don't know which of them to choose:
http://www.ebay.com/itm/DC-DC-Step-Up-Power-Supply-Module-3-6V-5V-to-12v-Boost-Mini-Micro-Converter-N130-/221815164258

http://www.aliexpress.com/item/2-pieces-lot-mini-dc-dc-converter

http://www.aliexpress.com/1.5v-dc-power-supply_reviews.html-0-9-5V-to-5V-DC-DC-step/32268732761.htmlhttp://www.aliexpress.com/item/DC-DC-Boost-Step-UP-Converter-1-5-3V-3-7V-4-5V-to-5V-Voltage/32409755078.html?spm=2114.01010208.3.342.XsORFU&ws_ab_test=searchweb201556_9,searchweb201644_3_505_506_503_504_502_10001_10002_10017_10010_10005_10011_10006_10003_10004_10009_10008,searchweb201560_8,searchweb1451318400_-1,searchweb1451318411_6449&btsid=1c12df37-6c3c-4603-934b-0c1fb7ed8cbd

http://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20160217102836&SearchText=dc+dc+converter+3v+to+5v

http://www.aliexpress.com/item/DC-DC-Boost-Step-UP-Converter-1-5-3V-3-7V-4-5V-to-5V-Voltage/32409755078.html?spm=2114.01010208.3.342.XsORFU&ws_ab_test=searchweb201556_9,searchweb201644_3_505_506_503_504_502_10001_10002_10017_10010_10005_10011_10006_10003_10004_10009_10008,searchweb201560_8,searchweb1451318400_-1,searchweb1451318411_6449&btsid=1c12df37-6c3c-4603-934b-0c1fb7ed8cbd

http://www.aliexpress.com/item/Small-and-light-DC-DC-0-8-5V-to-DC-5V-Step-UP-Boost-Voltage/32254368797.html?spm=2114.40010608.4.10.798DOg

[Skimask]

Oh god, you must be somewhere around 14 year old or just lazy. Do some homework by yourself

+1

Listen, Pavle..... do you have any intention of helping yourself? The extraordinarily broad questions are ridiculous.

It's amazing.
Between this guy and the other one, I'm waiting for some new ASCII art to show up.

[chris_leyson]

Pavel, I don't think your phone supports USB OTG. http://forums.androidcentral.com/ask-question/475465-why-isn-t-my-samsung-galaxy-s3-neo-recognizing-usb-otg.html look at reply #3, you need an adaptor cable. Just buy a new phone.

[chris_leyson]

Quote from Chalcogenide

The Nexus 4 did support OTG, but couldn't provide the power to any connected device, so I think that the S3 Neo is in the same boat.

Nexus 5 supports USB OTG.

[Pavle]

My phone support otg when I connect external power supply.

[Pavle]

What parts do I need except 0.8mm pcb???

[KL27x]

definition of cheap bastard. lol.

As a more reliable* backup, perhaps you could also make a self-contained battery powered adapter. Use a rechargeable cell phone minty boost thingy to power it. Just hack a USB cable to have a male USB plug to plug into the portable battery powered supply, then  a male micro USB to plug into the phone, and then w/e plugs you want to plug into the USB device (or just a standard female USB jack, where you can plug any number of cords)? Insta 5V and the boost converter, low battery cutout, and charging IC are already built in. Plus you can charge your phone with it, using a regular cord if necessary (the data lines on the charger are probably shorted together, so don't connect them between charger plug and the rest of the adapter cord.

the adapter cord may or may not be able to utilize the full output of the charger without those data lines connected. You could always put in a switch to short them, if this is the case, to make your cable multi-purpose.

*Just a hunch; no offense. Soldering a few wires together is a lot easier to make reliable, with enough hot glue and tape, than building a custom DC converter and trying to fit and hand-jumper it into a cell phone.

Food for thought: you definitely don't have room for a switch in there, either. So if you are a guy that habitually runs out of batteries all the way to shutdown, you should probably have to locate a power rail in the phone that cuts out when the phone shuts down, else you run a risk of ruining your phone battery if you wire it directly to the battery outputs.

[Pavle]

Do I need diodes or resistors???

[KL27x]

Oh, haha. I see. You're pulling our legs.


... right? That's either a good one, or maybe it's time to get back on your medication.

[AmmoJammo]

try running the device directly off the battery, rather than boosting it to 5volts.

[ali6x944]

Well again you could the simplest most basic ic for this, the MC34063 in so-8 package in the boost config, note u must remember this thing sould be runig at max switchig speed so u don't have massive componants,but still the inductor would be huge and it might not fit so maybe u could connect multible of them in seiris to increace inductance...
I will make some calculations and testing, in the main time search about discret boost conerters because thay come in much smaller packages.

[ali6x944]

Or use the smaller DFN8 package instaed what ever works for u

[rx8pilot]

The simplest and smallest solution is clearly a flux capacitor with a reactive feedback loop. This arrangement can easily mirror a typical schwartz LC filter which of course keeps it small. A dynamic dimension element could be added but at the expense of gate stability. If that stability trade off is acceptable, the resulting layout would be something like peanut butter that could be spread on the back of the host unit and thus providing the 5v. 

[AmmoJammo]

The simplest and smallest solution is clearly a flux capacitor with a reactive feedback loop. This arrangement can easily mirror a typical schwartz LC filter which of course keeps it small. A dynamic dimension element could be added but at the expense of gate stability. If that stability trade off is acceptable, the resulting layout would be something like peanut butter that could be spread on the back of the host unit and thus providing the 5v.

But do I need any resistors?!

[ali6x944]

Do I need diodes or resistors???

Of course u do u said u want a boost converter, so u would need Resistor, caps, inductors, to do it oviusly

[michaeliv]

Of course u do u said u want a boost converter, so u would need Resistor, caps, inductors, to do it oviusly

Where do I buy ?

[AmmoJammo]

Do I need diodes or resistors???

Of course u do u said u want a boost converter, so u would need Resistor, caps, inductors, to do it oviusly

He could just use something like a TPS61253....

IC, inductor, two capacitors....

http://www.ti.com/lit/ds/symlink/tps61253.pdf

[ali6x944]

Or simply salvage them from old car cellphone chargers all the parts will be there...

[AmmoJammo]

Or simply salvage them from old car cellphone chargers all the parts will be there...

But he wants to fit it into 20 x 8 x 2mm!

edit: wait, why would a buck regulator have the parts in it for a boost converter? 

[ali6x944]

The mc34063 is a tri-cofigurable, meanig it could be run in three different configs one of which is boost config , also I'm sorry i haven't made my-self clear enough, salvage the parts not the intair pcb.
After all, geting cheap disent shottkey 0805 smd diode and smd caps and so-8 package mc34063 is always preferd

And sorry again if i didn't make my self clear, and for the confusion i may coused sorry
 

[ali6x944]

Of cource u do, look at the datasheet below:
https://www.sparkfun.com/datasheets/IC/MC34063A.pdf

[KL27x]

He can't read the replies to his own thread. He can't figure out where to buy things that have been posted with direct links. But you still think he can read a datasheet...

[ali6x944]

And u r right, he should do a bit of work and tell us more about the phone ,
Target effesincy, budget, his purpass of all of this.
But Man don't be too harsh on the young man maybe he has economic problems or language or something like that or maybe he doesn't know any of these stuff ...

[KL27x]

But Man don't be too harsh on the young man maybe he has economic problems or language or something like

Yeah, sorry. If anyone finds my posts offensive, please keep in mind that there may be a language barrier. On my home planet, I'm hilarious.

[Pavle]

Do I just need this: TPS61253

[AmmoJammo]

Do I just need this: TPS61253

That's a good chip, but I do not think you can handle this. To play with BGA packages, you need at least a hot air gun station and quite some skill.
Try to get a QFN, SON or MSOP packaged device.

You do realise he only got that part number from my previous post, where I also listed that he'd need an inductor, and 2 capacitors 

I'd tackle that chip dead bug style! Might not work very well because of the high frequencies though..... 

[Pavle]

Does it matter what capacitors and inductor I use???

[AmmoJammo]

1uH inductor...
4.7uF capacitor on the input.
two 4.7uF capacitors in parallel on the output...

[michaeliv]

Ignoring everything else that is going on in this thread ...
If someone else actually wanted to do this (put a boost converter inside a phone and hook it up to the external microUsb jack in side the phone).... would that actually work ? Wouldn't the phone try to charge itself when it detects 5v on the input. I know some androids require the data pins to be shorted but I think that's only to charge at full speed ( above USB 500ma spec ).

[Pavle]

Is there a schematic???

[AmmoJammo]

Is there a schematic???

He could just use something like a TPS61253....

IC, inductor, two capacitors....

http://www.ti.com/lit/ds/symlink/tps61253.pdf

[Pavle]

Is this that: http://postimg.org/image/6fel88vvr/

[AmmoJammo]

yes...

[Pavle]

Is there a place on this pcb: TPS61253  for input and output???

[Skimask]

Is there a place on this pcb: TPS61253  for input and output???

You see those words "In" and "Out" in the previously posted picture?

Maybe "Input" = "In"?
Maybe "Output" = "Out"?
 
 

[Pavle]

Except  TPS61253 pcb,1 uH inductor and 4.7 and 10 uF capacitors do I need something more???

[Skimask]

Except  TPS61253 pcb,1 uH inductor and 4.7 and 10 uF capacitors do I need something more???

Have you read the TPS61253 datasheet?

Have you read a datasheet?

Have you read?

[Pavle]

Yes.

[Skimask]

And what did the datasheet say about the BP pin and the EN pin?

How about the input required?

What output is required, if any?

How about soldering the chip to a PCB?

Do you have the capability to solder a BGA, albeit a small low pin count BGA, package to a PCB?

Initial indications are negative at best.

[chris_leyson]

Guys this is getting silly. Does anyone have the same phone as Pavel, Samsung S... something, does it have OTG ?. It's pretty obvious you are asking for advice on how to build a boost converter and fit it into a phone. Have you tried turning on the USB OTG feature for your phone assuming its available ? If my phone didn't have USB OTG and I really really needed USB OTG I would buy another phone.

[Pavle]

My phone supports OTG when I connect external power supply.