Does anyone know of a chip that does the following function :
A serially loaded high-sided driver several outputs, with outpult voltage
rating greater than 15V and current > 100mA. The sort of function that
would normally be met by a latched shift register plus a handful of medium
current PNP devices or P channel FETs.
The only ones I can find are the UCN5810/1/2 or UCN6809-1868. family and
they are only rated at 25mA.due to Vce drop across emitter follower NPN
drivers. Are there any in the 100 to 500mA rating ?
I'm sure there must be a huge number of designers who want this in a single
chip, and it can hardly be a difficult IC fabrication task. It is surely
possible to fabricate medium current PNP transistors on the same die as NPN.
There are quintillions of the NPN equivalent low sided switch - just about
every micro controller to relay interface uses one !
(Needed to automatically switch power rails to a range of VCO modules
depending on frequency, in a wide band synthesizer under computer controll)
Andy G4JNT
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