Parts are getting hard to find......

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I am looking for a small...low parts count switching regulator(s)

 

Spec is as follows:

 

Input voltage is 15-40 volts DC

Output voltage is 12volts, or 5 volts

Output current is no higher than 200mA for each voltage, but I would like a regulator that can do 500mA if possible.

Prefer to use as small an inductor and capacitor for inputs and outputs as possible.

SMD package

 

I have to generate a 12vdc rail, and a 5vdc rail.  So if I use an adjustable regulator, I use two and change the feedback resistor(s).

 

Problem is...  Theres no stock at most of teh usual suspects.

 

Linear regulators I can get.  Might have to use those until things become available again...in a few years

 

Jim

This topic has a solution.

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

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Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

Last Edited: Thu. Apr 7, 2022 - 10:23 PM
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“Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?” - Brian W. Kernighan
“Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” - Antoine de Saint-Exupery

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I was going to suggest L5970D I have used lots of them in the past but I don't have any left and neither does Digikey. sad

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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"Dare to be naïve." - Buckminster Fuller

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Thats a nice part.  Certainly meets requirements.  $4.00 a piece.  OUCH!  But times are tough

 

js wrote:
I was going to suggest L5970D

Good suggestion, and I thought of it as well, but I need teh input voltage near +40vdc for surge reasons as this might go into a hostile power environment

 

THAT might be a winner!

 

I think I can get away with not using SOIC and instead the DFN package for final work.  Too bad no SOIC or DIP where I can make up a quick prototype of teh power supply for testing

 

 

Thanks all!  Keep the ideas coming.

 

JIm

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Monolithic Power Systems modules are on Arduino Nano Every.

 

re that module, good price though am personally leery due to the current supply chain issue (container ships may still have a long queue at US ports)

 


NANOEveryV3.0.sch (grid A1)

MPM3610 | 21V Input, 1A Module Synchronous Step-down Converter with Integrated Inductor | MPS

 

Pololu 5V, 300mA Step-Down Voltage Regulator D24V3F5

 

edit :

MPM3570E | Ultra Low EMI, 75V Input, 0.3A Step-DownPowerModule with Integrated Inductor | MPS

edit2 : MPM3570E may have a very long lead time

 

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Thu. Apr 7, 2022 - 02:55 AM
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Of course the next drama may be the inductors regardless of device used.

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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Thanks to this thread I found a few more Xmegae5 chips laugh you keep on helping out even without trying Jim.

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

This reply has been marked as the solution. 
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the original simple switcher is widely copied LM25xxx LM26xxx and goes to 40V or 42V

 

or maybe

 

 

oldie--but low cost:

Prefer to use as small an inductor and capacitor

These MC34063 are not so much that--they run around 100kHz, the 1-2 MHz parts will have smaller inductors

 

Take a good look here: https://www.mouser.com/datasheet...

BD9G102G-LB  In stock (Mouser & Newark), and decent price ($1.11 @ 100)

They have fixed voltage styles, if you wanna save a few resistors (but then your IC quantity price gets cut in half)

 

Since the Driver is mostly off (duty 5/40, or 12/40) , a synchronous FET type would have better efficiency than the schottky diode loss at the higher input voltages....but much rarer birds. and more $$

 

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Thu. Apr 7, 2022 - 04:58 AM
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LM2596, nothing else (for 40V input).

 

 

Edit: If you can be happy with 35V, then the price is 2$, board is like this.

There are zillions of offers in EB/Ali.

 

 

 

Last Edited: Thu. Apr 7, 2022 - 05:58 AM
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Tell me about it Jim, I've been forced to go to Ebay or Amazon for the parts I need to do equipment repairs, Amazon is quicker on delivery but limited on what parts are available, Ebay is slower but so far I have been able to find what I need.

 

Flyover Jim

 

 

FF = PI > S.E.T

 

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avrcandies wrote:
BD9G102G-LB  In stock (Mouser & Newark), and decent price ($1.11 @ 100)

 

Did not see any at mouser, but on a secondary market they had them.  Went with those.....Candyman gets teh win.

 

js wrote:
Of course the next drama may be the inductors regardless of device used.

Yeah, no S***! I had to go hunting for teh ones I needed.

 

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user