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Electronics => Repair => Topic started by: spetros on August 18, 2024, 07:35:51 am

Title: SOT23-6 with marking code LC01 or 7300
Post by: spetros on August 18, 2024, 07:35:51 am
Hello.

I have tried to identify the following IC.

As i can see from the other components near to it  this is a bulk dc converter controller but i cannot find which one.

Thank you for any help



Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: Vicus on August 18, 2024, 11:37:05 am
Can you identify the pin function?
Are you shure is not a linear device? Where is the coil?
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: spetros on August 18, 2024, 11:55:21 am
Thank you for your answer.

I am attaching another one photo of the board with some components removed.

I am sure because it takes 12V and at the outputs 5V
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: fzabkar on August 18, 2024, 02:47:52 pm
The topology looks more like a boost converter with an output voltage of 12V. Pin #3 looks like the feedback pin, with the FB voltage being 1.0V.

  Vout = 1.0V x (100K + 9100) / 9100 = 11.99V
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: spetros on August 18, 2024, 04:10:31 pm
Thank you for your answer.

I attach the circuit diagram of the unknown ic .
Maybe it will help to identify it.

Edit ( The diode is not shottky but a diode with marking L2V9 which is unknown too )

Also i have found the same IC but with marking AJ2hD from another same board

Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: Vicus on August 18, 2024, 04:38:28 pm
https://www.tme.eu/it/katalog/regolatori-ad-impulsi-circ-integrati_112882/?params=35:1443748;2900:1623616;364:1895193,1895165,1895140,1544378,1895166,1895209&productListOrderBy=1000014 (https://www.tme.eu/it/katalog/regolatori-ad-impulsi-circ-integrati_112882/?params=35:1443748;2900:1623616;364:1895193,1895165,1895140,1544378,1895166,1895209&productListOrderBy=1000014)
In this case it was quite easy.
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: fzabkar on August 18, 2024, 04:47:36 pm
https://ipv4.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+stepdown+converter+%220.8V%22++%22sot23-6%22 (https://ipv4.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+stepdown+converter+%220.8V%22++%22sot23-6%22)

Just a few of the results with matching pinout and FB = 0.8V ...

LMR12010
https://www.ti.com/lit/gpn/LMR12010 (https://www.ti.com/lit/gpn/LMR12010)

MP2259
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2259/?srsltid=AfmBOopInIlHLUjkg28z_CGm9P-VTLPHeCjUkSL5VddM4ZhIcQvgdBV2 (https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2259/?srsltid=AfmBOopInIlHLUjkg28z_CGm9P-VTLPHeCjUkSL5VddM4ZhIcQvgdBV2)

TMI3253S
https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2001060933_TMI-TMI3253T_C478945.pdf (https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2001060933_TMI-TMI3253T_C478945.pdf)

RY8401
https://file2.dzsc.com/product/23/04/03/1155400_110901434.pdf (https://file2.dzsc.com/product/23/04/03/1155400_110901434.pdf)

MP2451
https://www.szhuge.com/file/productpdf/839914882425100.pdf (https://www.szhuge.com/file/productpdf/839914882425100.pdf)
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: fzabkar on August 18, 2024, 04:56:09 pm
Quote from: spetros on August 18, 2024, 04:10:31 pm
Also i have found the same IC but with marking AJ2hD from another same board

AP5100WG / AP5100W, Diodes Inc, step-down converter, 1.2A, 1.4MHz, VIN 4.75V to 24V, marking AJxxx, SOT26
https://www.diodes.com/assets/Datasheets/AP5100.pdf (https://www.diodes.com/assets/Datasheets/AP5100.pdf)

MP2359 looks compatible:

https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2359/document_id/228?srsltid=AfmBOopTtu2j1NZVhDFMtHLM87ERnWK7vWUJrdpoFSksD4QmzoLYddZ_ (https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2359/document_id/228?srsltid=AfmBOopTtu2j1NZVhDFMtHLM87ERnWK7vWUJrdpoFSksD4QmzoLYddZ_)

Also AMS1073 ...

http://www.datasheet.hk/download.php?id=1975839&pdfid=9218D18D47689B304860A1D6AEF396E8&file=0489\ams1073_7244640.pdf (http://www.datasheet.hk/download.php?id=1975839&pdfid=9218D18D47689B304860A1D6AEF396E8&file=0489\ams1073_7244640.pdf)


The diode could be MBR120VLSFT1 or NRVB120VLSFT1G (Schottky Power Rectifier, Surface Mount, 1.0 A, 20 V).

http://markingcodes.com/search/c/L2v (http://markingcodes.com/search/c/L2v)
Title: Re: SOT23-6 with marking code LC01 or 7300
Post by: spetros on August 19, 2024, 03:00:24 am
THANK YOU fzabkar for your  detail information

You were very helpfull :-+