I haven't found the part you mentioned (yet). But I'll offer some resources you may or may not have looked at already.
Based on what you've told and shown us, we're looking for a 10-pin chip, in a surface mount package with leads, that is a photoflash capacitor charger with IGBT driver. The following sites turn up with several chips that fit this description:
Digikey
Mouser
FindChips
I don't think there's a way to link directly to the search results. I began by searching for "photoflash" or "photo-flash" and filtered the results based on the description.
I've looked through a handful of the Digikey results and haven't come up with any matches based on manufacturer part number. That's not to say one of the results isn't your chip. It's isn't unheard of that chip markings on smaller chips don't match their part number. I'd suggest looking through the datasheets and see if any of them mention their markings. Some of the manufacturers include some of the usual suspects: Texas Instruments, Maxim, Linear Technology, and Allegro Microsystems.
Good luck!
EDIT:
I still haven't come up with anything, but I was thinking about it a bit more. I hope I haven't led you astray, but I was wondering whether the chip actually has leads. The picture is small and a bit blurry (understandable), so it's a little difficult to judge. I bring this up partly because of the dimensions you added. There doesn't seem to be a 10-pin package with leads that is that small. Most of what I saw were 10-MSOP, which seem to typically be 3mm x 3mm. However, there are some DFN packages that are smaller and at least get the ratio correct, i.e. 3mm x 2mm. You may want to peruse any parts without leads that you (and I) may have discounted earlier.
Lastly, if you're desperate for more info, and confident in your soldering skills, you might consider removing the chip completely. There doesn't appear to be any silkscreen on the board, but the underside of the chip itself may reveal either an exposed pad or more text.
Hope that helps.
Connectors are always a dog's breakfast.. In Digikey's search engine, try "Rectangular Connectors, Spring Loaded".
Below is a similar type.
Best Answer
It's almost certainly a proprietary part, probably an application-specific smoke detector chip. The part number would either be dictated by the customer, or cooked up in cooperation between Motorola and the customer.
Smoke detectors are small, high-volume, and at least moderately high-tech; this is a combination that leads to ASICs.
For the purpose of making a loud noise, I suspect you want to look at the sounder and the transistor that's just below it in the component-side view. I suspect that the chip just applies power to that circuit, or possibly bias, or a square wave applied to the transistor base.