Need help to identify SMD component - Page 1
Forum section: electronics / repair

author: titusdis
author_rank: Newbie
timestamp: November 23, 2020, 12:43:02 pm
content: Hello all!I am looking for some assistance, identifying an smd component, which gets very hot upon plugging in aFocusrite 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 922AVDK 922But no luck on that search. Thanks in advanceTitus

author: Inari
author_rank: Contributor
timestamp: November 23, 2020, 02:46:47 pm
content: Maybe this helps little?https://www.szgolon.com/search?keywords=AUDK

author: tszaboo
author_rank: Super Contributor
timestamp: November 23, 2020, 03:59:01 pm
content: 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.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 23, 2020, 04:23:36 pm
content: It looks very much like the Ricoh RP500x series, but it looks like it has the pinout of the DFN series, not the SOT-23-6Whttps://www.mouser.jp/datasheet/2/792/rp500-ea-911465.pdf

author: fzabkar
author_rank: Super Contributor
timestamp: November 23, 2020, 06:22:48 pm
content: 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

author: titusdis
author_rank: Newbie
timestamp: November 24, 2020, 01:35:59 pm
content: 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 1AmpSOt 563 (I can manage some wiring, but correct pinout would be superb)Sincerely: Titus

author: titusdis
author_rank: Newbie
timestamp: November 24, 2020, 02:17:27 pm
content: 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:TItuszP.S: Blog nincs esetleg? megnézném

author: m k
author_rank: Super Contributor
timestamp: November 24, 2020, 04:40:04 pm
content: I thought you were also Dutch.

author: titusdis
author_rank: Newbie
timestamp: November 24, 2020, 04:44:34 pm
content: Nope, i am hungarian.

author: fzabkar
author_rank: Super Contributor
timestamp: November 24, 2020, 07:32:15 pm
content: https://www.richtek.com/assets/product_file/RT5760/DS5760-02.pdfhttps://www.richtek.com/assets/product_file/RT5760A=RT5760B=RT5760C=RT5760D/DS5760ABCD-04.pdfhttps://www.diodes.com/assets/Datasheets/AP61100-AP61102.pdfhttps://www.monolithicpower.cn/cn/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP1601/document_id/1038There are many more possible equivalents:https://duckduckgo.com/?q=sot563+converter+"0.6V"+filetype:pdfThe 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-optionsOr 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=buynowhttps://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