Help needed to identify a boost regulator chip.

ashok · 03:18 PM

Can anyone help me identify the chip on this dc-dc voltage boost module.
It only has the following marked on it - " A7 - 9H / GOE " . It's obviously a boost type switching regulator circuit.
The input is 3 volts to about 6 volts and output is a regulated 12 volts dc. I think it is limited to about 300mA or thereabout. I don't have any data sheet. The supplier declined to give the manufacturer's name or technical details about the board. I can't get the boards easily either. I would have liked to know who manufactured it.

So it looks like I need to replicate this board and I need to ensure that I maintain the size. This board is about 20 x 15 mm ( about 0.8 inchex x 0.6 inches ). The inductor might be 47uH. Two resistors , four capacitors and two diodes (?).
I couldn't find a suitable chip that is similar to this one though there are several with more pins and components on them.This one is either from Taiwan or China.The board has no markings on it except input and output/gnd indication . It's a double sided pcb though the bottom plane is just a ground plane.
Any help will be appreciated.
Thanks.
Ashok.

ashok · 9th September 2009, 02:27 AM

Anybody out there ?

ashok · 11th September 2009, 04:59 PM

Well I find the MC34063A chip closest to this chip. Some more parts but doable.
Thanks for all those who looked at this thread but had no solutions.
Consider this thread closed as I have one solution that is the closest equivalent I can find.
Cheers.

IVX · 12th September 2009, 02:06 AM

Tps61085?

star882 · 12th September 2009, 03:01 AM

Design your own power supply from one of the many boost converter chips out there. It's not very difficult.

ashok · 03:22 AM

Hi IVX,
Thanks a ton. The Tps61085 is certainly a better chip for me. I'll have to see if this is vailable here .

IVX · 12th September 2009, 03:59 AM

Quote:

Originally Posted by ashok

Hi IVX,
Thanks a ton. The Tps61085 is certainly a better chip for me. I'll have to see if this is vailable here .

I mean it's looks like Tps61085 pin2pin compatible, isn't it?

ashok · 07:17 AM

Hi IVX,
Yes it appears to be pin compatible. I checked the traces on the board. Only diff was that pin1 on the board seems to have a diode going to ground . I measured in circuit and so it is possible that I might be measuring devices internal to the chip rather than the external passive device , though it does say D1 on the board. The Texas chip has a compensation resistor and cap on that pin. Functionally they appear to be identical .

I was comparing the Texas chip with the MC34063A which uses more passive parts and is not pin compatible.
The chip on the board might be a clone of the Texas chip or functions identically and the pin out is identical. The inductor also seems to be in a similar range. MC34063A ~ 170uH . Tps61085 ~ 3.3uH and the inductor on the board is marked 4R7 which I guess is 4.7uH.
Thanks.

luka · 12th September 2009, 08:30 AM

best bet is MC33063

IVX · 14th September 2009, 11:56 AM

Quote:

Originally Posted by luka

best bet is MC33063

maybe, but frequency of 33063 is 12 times lower

9th September 2009, 02:27 AM	#2
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Anybody out there ? __________________ AM

11th September 2009, 04:59 PM	#3
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	??? Well I find the MC34063A chip closest to this chip. Some more parts but doable. Thanks for all those who looked at this thread but had no solutions. Consider this thread closed as I have one solution that is the closest equivalent I can find. Cheers. __________________ AM

12th September 2009, 02:06 AM	#4
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Tps61085? __________________ Best regards, E1.

12th September 2009, 03:01 AM	#5
star882 diyAudio Member Join Date: Mar 2007	Design your own power supply from one of the many boost converter chips out there. It's not very difficult. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

12th September 2009, 03:06 AM	#6
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Hi IVX, Thanks a ton. The Tps61085 is certainly a better chip for me. I'll have to see if this is vailable here . __________________ AM Last edited by ashok; 12th September 2009 at 03:22 AM.


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12th September 2009, 07:12 AM	#8
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Hi IVX, Yes it appears to be pin compatible. I checked the traces on the board. Only diff was that pin1 on the board seems to have a diode going to ground . I measured in circuit and so it is possible that I might be measuring devices internal to the chip rather than the external passive device , though it does say D1 on the board. The Texas chip has a compensation resistor and cap on that pin. Functionally they appear to be identical . I was comparing the Texas chip with the MC34063A which uses more passive parts and is not pin compatible. The chip on the board might be a clone of the Texas chip or functions identically and the pin out is identical. The inductor also seems to be in a similar range. MC34063A ~ 170uH . Tps61085 ~ 3.3uH and the inductor on the board is marked 4R7 which I guess is 4.7uH. Thanks. __________________ AM Last edited by ashok; 12th September 2009 at 07:17 AM.

12th September 2009, 08:30 AM	#9
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	best bet is MC33063

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