high side sensing

[Michael Robinson]

I need an op-amp (dual or quad) with a common mode that includes the top
rail like the TL072/082, but doesn't require a 6 volt supply to work.
I've found the LT1490. Not much else. Problem is, there's no way to narrow
digikey's parametric search in such a way as to return the kind of op-amps
I'm looking for. Other search engines are no better than digikey. Even
google lets me down, when I type in "op amp common mode top rail."
Analog Devices has some nice op-amps, some work around two or three volts
but have a low maximum supply voltage. I want something that operates from
a fairly wide range of supply voltages, like 4 to 22 volts.
I've spent too much time searching, and it's getting frustrating. I just
wish there was a really good parametric search method to sift through the
thousands of op-amps available out there. Do you guys have any suggestions?

 

[Hammy]

On Sat, 12 Jun 2010 20:12:36 -0400, "Michael Robinson"
<nospam@billburg.com> wrote:

I need an op-amp (dual or quad) with a common mode that includes the top
rail like the TL072/082, but doesn't require a 6 volt supply to work.
I've found the LT1490. Not much else. Problem is, there's no way to narrow
digikey's parametric search in such a way as to return the kind of op-amps
I'm looking for. Other search engines are no better than digikey. Even
google lets me down, when I type in "op amp common mode top rail."
Analog Devices has some nice op-amps, some work around two or three volts
but have a low maximum supply voltage. I want something that operates from
a fairly wide range of supply voltages, like 4 to 22 volts.
I've spent too much time searching, and it's getting frustrating. I just
wish there was a really good parametric search method to sift through the
thousands of op-amps available out there. Do you guys have any suggestions?

Whats wrong with the LM8262.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=LM8262MMCT-ND

For HS current sensing you could also just use a current mirror.