EEVblog 1475 - What's This SMD Part?

Answering another viewer question. Can we identify or find an alternative for this SMD part?

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#ElectronicsCreators #SMD #Components

[mikeselectricstuff]

Running a feedback line under the inductor would be a terrible layout decision as it's a sensitive node that needs to be kept well away from the noisy switching output

[toobigtofit]

Another thing to be careful with if you're going to "drop in" a regulator without knowing what the original part was: the enable may be either Active Low, or Active High.

[andrereuter]

I would definitely buy a giant EEVblog poster with all the SMD packages...

[Robin-kylc]

18:28 actually, this is not a filter cap, it is a feedback-forward cap which allows to adjust/improve the phase margin of the regulator by compensating the low pass behavior of the feedback path.

[TheDefpom]

I would be inclined to get the connections figured out from the switching regulator to figure out where it is going (probably the big IC), and then get the data sheet for the IC and find out what the input voltage should be.

[amirb]

Mostl likely this is AAT1141 made by Analogic Tech (Fast Transient 600mA Step-Down Converter) pin out is quite general like the ones mentioned in the video but the marking matches AAT1141

[frogz]

when searching open google for very specific things, do not forget to add "quote marks" around your search to force it to search that SPECIFIC term, it didnt help me find this part directly but it did bring me onto onsemi

[abeleski]

its a sad industry when you cant identify a part by what's written on the chip.

[seritools]

Here's a workaround for the small cursor capture:
1) disable cursor capture in OBS/XSplit
2) open the Windows Magnifier (the accessibility tool) and just have it zoomed out at 100%. Just keep it open in the background. This will cause Windows to render the cursor differently, straight to the screen/desktop texture.

[muctop]

Back to the roots!
Thank you Dave!
That´s where we all came from, watching your brilliance in analyzing
I´m so happy

[Nik]

There are some awesome TI SOT23-5 switching regulators that can go up to 5A. They get quite toasty at 5A (but they still work fine at 25 degrees ambient), so i use them to around 2-3A and they stay quite cool at that kind of load.
They do this by having a really interesting bonding technology that is done using the pin frames, and not just the thine bonding wires. That way then can dissipate a lot more heat than usual SOT23-5.

[JWH]

You should definitely do some more random dives like this on a variety of different cases, I think it's good to step people through your reverse engineering process with limited information.

[taylorsharp]

I wish people would take wider shots when they ask stuff like this. The context clues about what it's connected to are very helpful.

[TheHuesSciTech]

21:00 The internal reference voltage for adjustable regulators **is** generally visible in parametric search -- as the minimum value in the Output Voltage Range. Because, after all, R2 = 0, R1 = open leads to Vout = Vref. You might not want to bet your kids on the parametric value being correct, but it's hugely helpful as a first filtering pass at least.

[JasonDelaneCox]

FT440AA from Fremont Micro Devices Ltd.

[TrickyNekro]

Also because it's a recorder and not incorporated in the car, the only failure mode they have to care about is not shorting the busses / create problems when it monitors, so it could just be an obscure Chinese jobby because they just don't care. These don't have to be AEC-100 / 101.

[cmscoby]

What a wonderful public service you do for us young players in the design community!!!!

[heikojakob]

Nisshinbo is the successor of New Japan Radio and Ricoh Electronic Devices.

[realdragon]

He figured out more in a minute than I could ever do after hours of googling

[MikkoRantalainen]

16:30 Great detective work and I learned to figure out unknown chips better given this example.