Who is a manufacturer ? - Page 1
Forum section: electronics / general

author: Jane
author_rank: Frequent Contributor
timestamp: August 14, 2013, 12:34:49 pm
content: Does anyone know who makes the IC in the picture below?I can not find the datasheet.Thanks

author: dr.diesel
author_rank: Super Contributor
timestamp: August 14, 2013, 12:38:07 pm
content: Linear Technologies, solid state relay IIRC...

author: Jane
author_rank: Frequent Contributor
timestamp: August 14, 2013, 12:53:36 pm
content: Thank you for the reply.Yes, logo looks like Linear Technologies' logo.It should be a voltage regulator. It makes 5V output from 12V input. But I can not find a datasheet.When searching shall I use the first number 216 or the number on the second line 3830 of that IC?Can you please help?Thank you

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 14, 2013, 12:55:52 pm
content: http://datasheet.elcodis.com/pdf2/120/55/1205589/lt3830.pdf

author: dr_p
author_rank: Frequent Contributor
timestamp: August 14, 2013, 01:26:03 pm
content: for future unknown logos, one can use this logo DB:http://www.siliconinvestigations.com/logos/logos.htmedit: alsohttp://faq.tweakers.net/cme/iclogos/

author: Jane
author_rank: Frequent Contributor
timestamp: August 14, 2013, 02:08:33 pm
content: Thank you ALL for the replies. I checked the datasheet athttp://datasheet.elcodis.com/pdf2/120/55/1205589/lt3830.pdfbut there is a typical application that uses MOSFETs but my device that uses that IC has NO MOSFETs.The G1 ( pin 1) is connected via a capacitor to GND ( pin 3) and G2( pinalso via capacitor goes to PCB's ground.So I am not sure if it is the correct datasheet or not. Or can it work without MOSFETs too?

author: marshallh
author_rank: Unknown
timestamp: August 14, 2013, 05:49:40 pm
content: Put LTC in front of the number for Linear Tech partsLTC3830 stepdown dc/dc controllerhttp://www.linear.com/product/LTC3830

author: Jane
author_rank: Frequent Contributor
timestamp: August 14, 2013, 08:33:06 pm
content: But is it possible that in my device that uses that IC there are NO MOSFETs?In that datasheet , see a typical application design picture, there ARE MOSFETs. So I am not sure ifhttp://www.linear.com/product/LTC3830is a correct datasheet.In my device the G1 ( pin 1) is connected via a capacitor to GND ( pin 3) and G2( pin 8 ) also via capacitor goes to PCB's ground.So, NOT MOSFETs.

author: c4757p
author_rank: Super Contributor
timestamp: August 15, 2013, 02:57:12 am
content: That's not how non-obnoxious advertising works. Please don't derail threads to peddle your services.Edit: There was a post above mine... I wasn't being a dick to Jane!

author: nitro2k01
author_rank: Frequent Contributor
timestamp: August 15, 2013, 03:44:20 am
content: I'm guessing this board never worked? Consider the possibility that someone put the wrong IC on the board. Either that or someone did a poor job designing it.For example, pin 5 looks like the feedback pin. (2 resistors+1 cap.) Try to figure out what each pin might do from the components conected to it, and look for a different chip that matches that. That is the best advice I can give, I think. Maybe start looking for other LT 8 pin switching power supply circuits.

author: dr_p
author_rank: Frequent Contributor
timestamp: August 20, 2013, 08:27:21 am
content: Most(?) silkscreen IC markings have a notch to show orientation. Since this is not visible I suspect it's on the other side, so the chip looks rotated 180 degrees.Also, the larger top-right pad (currently occupied by pin 4 of the 3830) seems to be GND.What's the story with this board? Where did it come from?

author: Jane
author_rank: Frequent Contributor
timestamp: August 20, 2013, 08:04:25 pm
content: Thank you ALL for the replies. There IS a notch on the IC, it is not only seen in the picture.This IC works as a voltage regulator from 12V to 5V.So, I wonder if that IC LTC3830, can work even without MOSFETs.(MOSFETs could be omitted to cut the cost of the device)Does anyone know?

author: edavid
author_rank: Super Contributor
timestamp: August 21, 2013, 08:44:47 pm
content: Quote from: Jane on August 20, 2013, 08:04:25 pmNo, not possible.Where did you find this board? Can you take a photo of the whole thing?If it came from consumer electronics, perhaps the IC has a random fake marking.

author: Jane
author_rank: Frequent Contributor
timestamp: August 22, 2013, 08:26:26 pm
content: Yes, it is a consumer electronic. The manufacturer does not want to provide a datasheet for that IC but is willing to give a few ICs free for the repairment.

author: edavid
author_rank: Super Contributor
timestamp: August 23, 2013, 02:03:23 am
content: Quote from: Jane on August 22, 2013, 08:26:26 pmMaybe it's a 34063 or something similar.

author: c4757p
author_rank: Super Contributor
timestamp: August 23, 2013, 02:05:39 am
content: Quote from: edavid on August 23, 2013, 02:03:23 amIt's not connected like one.