If one goes by the single cell figures, one could run all 6 cells down to 1V per cell or 6V total, but for some apps that use a regulator (not LDO), 7.5V seems to be the minimum.
But then I regularly let some CMOS circuits run 'em down to 3V. :o)
Blaa... Blaaa... Blasphemy! That is blasphemy to my ears friend.
There are a number of features that make the Si4490DY interesting. That part is a trench MOSFET. That by itself is interesting to me, I wasn't aware anyone was making medium voltage trench MOSFETs. Upon looking at Vishay's MOSFET lineup I now see they have quite a selection of modest voltage trench products up to 250V.
The MOSFET has very impressively low 80milliOhm on resistance for a 200V part in a SO8 package. That alone is pretty special. That might be an industry record by itself. The part also has substantially lower gate charge than might be expected at only 42nC at 10V. That is very good considering that something like the IRF640N has 67nC gate charge but a much higher 0.15 Ohm on resistance. The Si4490DY also features an extremely good body diode reverse recovery time rating (70ns typical, 100ns max.). Unfortunately the datasheet is really skimpy and missing allot of details (such as diode reverse recovery charge), but for a 200V rated part this is clearly superior to pretty much all of its competition. Mouser sells them for $1.95 in single unit quantity. That isn't anything too special to write home about, but at least it is available if your application calls for it. Although trench MOSFETs usually have inferior avalanche ruggedness compared to their planar counterparts, the Si4490DY is still avalanche rated and is still fairly robust in that category as well. The on resistance versus temperature graph may also be ever so slightly superior to many of it's potential competitors.
Overall it is certainly noteworthy, even if it only makes evolutionary improvements on other previous and current parts.
It ain't watcha got, its the way hatcha do it.
RL
Hi Watson,
Not really. Newer wood stoves are pretty nifty devices, blue flames, no smoke. No stuffed nose from forced-air heating. Lots of exercise without gym membership fees. But best of all, when the wood stove runs the exorbitant cost from propane usage drops to zilch. It's pretty power outage proof, too.
Cooking out here is sometimes equally rustic. Right now a turkey is slowly getting ready in the Weber charcoal grill. With mesquite chips, marinade injection and the whole nine yards. We always make sure to have at least 100 pounds of charcoal before the winter begins and stores run out. If that ain't enough, guess what, we scavenge some from the wood stove. Talking about multi-tasking... ;-)
Regards, Joerg
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