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Li-Charger IC: Searching for datasheet

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  Li-Charger IC: Searching for datasheet Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2017-03-24 23:43 +0100
    Re: Li-Charger IC: Searching for datasheet Joerg <news@analogconsultants.com> - 2017-03-24 16:25 -0700
      Re: Li-Charger IC: Searching for datasheet Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2017-03-25 01:30 +0100
        Re: Li-Charger IC: Searching for datasheet Joerg <news@analogconsultants.com> - 2017-03-25 08:00 -0700

#453464 — Li-Charger IC: Searching for datasheet

Dear experts,

I'm searching for the datasheet for this IC:

<http://www.bilder-hochladen.net/files/big/12b4-js-a905.jpg>

Manufacturer obviously is Microchip Technology, but that's all what
I've been able to find out. Therefore I do hope to find help here.

Thanks in advance

Reinhard

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#453468

On 2017-03-24 15:43, Reinhard Zwirner wrote:
> Dear experts,
>
> I'm searching for the datasheet for this IC:
>
> <http://www.bilder-hochladen.net/files/big/12b4-js-a905.jpg>
>
> Manufacturer obviously is Microchip Technology, but that's all what
> I've been able to find out. Therefore I do hope to find help here.
>


This could be a custom chip by Micross:

http://www.micross.com/semiconductor-services.aspx

In that case you won't get any information because it is proprietary to 
their customer. However, it can't hurt to ask whether they'd be willing 
to forward your request to that customer.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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#453475

Joerg schrieb:

[...]
> This could be a custom chip by Micross:

Hi Joerg,

thanks for the info but, hmm, I'm not convinced:

<http://www.bilder-hochladen.net/files/big/12b4-jt-4031.jpg>

Micross' letter M logo starts more with a dot than with a (short)
line ...

Best regards

Reinhard

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#453555

On 2017-03-24 17:30, Reinhard Zwirner wrote:
> Joerg schrieb:
>
> [...]
>> This could be a custom chip by Micross:
>
> Hi Joerg,
>
> thanks for the info but, hmm, I'm not convinced:
>
> <http://www.bilder-hochladen.net/files/big/12b4-jt-4031.jpg>
>
> Micross' letter M logo starts more with a dot than with a (short)
> line ...
>

It does but the number on your chip does not fit the usual numbering 
schmeme at Microchip at all.

Another scenario would be a custom run at Microchip. AFAIK they offer 
that only for the high-rel market but I may be wrong or it may have been 
different in the past:

http://www.microchip.com/design-centers/rad-hard/asics

What I have also seen, and I don't know if Microchip ever did this, is 
ICs from regular manufacturers packaged in a special fashion for a large 
customer. Then they get a unique number, nobody else knows what is in 
side and nobody talks.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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