Need help to identify SMD component

[titusdis]

Hello all!

I am looking for some assistance, identifying an smd component, which gets very hot upon plugging in a
Focusrite 4i4 3gen (USB C) soundcard, which shows no sign of life at all.

The part is a 6 pin SOT23 (?) thingy, with U31 marking on the PCB no idea what it is. Some sort of DC-DC converter? Transistor?
Rail-to-Rail converter?
What i suspect id tha marking says:
AUDK 922
AVDK 922
But no luck on that search. Thanks in advance
Titus

[Inari]

Maybe this helps little?
https://www.szgolon.com/search?keywords=AUDK

[tszaboo]

That is a DC-DC stepdown converter (Kapcsolóüzemű tápegység). There is a testpoint next to it, labeled 3.3V, that must be the output, and there is a tespoint on it, labeled VBUS.
If you cannot find out what it is, just desolder the IC and the inductor, and replace it with any module which could do 2-300mA.

[PA0PBZ]

It looks very much like the Ricoh RP500x series, but it looks like it has the pinout of the DFN series, not the SOT-23-6W 
https://www.mouser.jp/datasheet/2/792/rp500-ea-911465.pdf

[fzabkar]

MP2141NGTF, Monolithic Power, 1A, Synchronous, Step-Down Converter with 11μA Quiescent Current, 2.3V - 5.5Vin, 1A, marking AUDx, SOT563:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2141N/document_id/997/

This is the resource I used:
http://chip.tomsk.ru/chip/ChipDoc.nsf/vc1?readform&start=19500&view=smd&cat=A&count=500

[titusdis]

Thank You guys for the identification, it really is an Mp2141 i suspect.
Unfortunately i can't get a hold of this unit, (10-14 weeks to produce 5000 pcs...)
So i am looking for a substitution.
Anyone got an idea?
As far as i see it should make 3.3 V out of 5V 1Amp
SOt 563 (I can manage some wiring, but correct pinout would be superb)
Sincerely: Titus

[titusdis]

To NANDBLog:

Köszönöm a meglátást, azt hiszem azt kell tennem amit irtál, mert az alkatrész nem hozzáférhető,
de furcsa is, hogy alapból ezt 1.8- 1.2 V outputra használják, itt pedig 3.3-hoz (gondolom)
Esetleg tudsz ajánlani valami helyettesitést?
Sajnos a VBUS-t sem tudom mennyi lehet, de sejtésem szerint 5V.
Ha ma sikerül leforrasztani ezt a kis Stepdownt, remélem elindul annyira hogy mérni tudjak.
Üdv szintén kishazánkból:TItusz

P.S: Blog nincs esetleg? megnézném

[m k]

I thought you were also Dutch.

[titusdis]

Nope, i am hungarian. 

[fzabkar]

https://www.richtek.com/assets/product_file/RT5760/DS5760-02.pdf

https://www.richtek.com/assets/product_file/RT5760A=RT5760B=RT5760C=RT5760D/DS5760ABCD-04.pdf

https://www.diodes.com/assets/Datasheets/AP61100-AP61102.pdf

https://www.monolithicpower.cn/cn/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP1601/document_id/1038

There are many more possible equivalents:
https://duckduckgo.com/?q=sot563+converter+"0.6V"+filetype:pdf

The FB voltage (0.6V) is important, otherwise you would need to change the feedback resistors.

Diodes Inc provides samples:
https://www.diodes.com/part/view/AP61100#tab-product-options

Or you could buy from Digikey or Mouser:

https://www.digikey.com/en/products/detail/AP61100QZ6-7/31-AP61100QZ6-7CT-ND/12324909?WT.z_cid=ref_netcomponents_dkc_buynow&utm_source=netcomponents&utm_medium=aggregator&utm_campaign=buynow

https://au.mouser.com/ProductDetail/Diodes-Incorporated/AP61100QZ6-7?qs=TiOZkKH1s2T9iXX3VgPl9g%3D%3D&utm_source=netcomponents&utm_medium=aggregator&utm_campaign=AP61100QZ6-7&utm_content=Diodes%20Incorporated