3.3V-42V Hi-Side Current Sense IC

[dknguyen]

DOes anyone know of a high side current sense amplifier IC that can tolerate common mode sense voltage up to 42V, but can be powered by a 3.3V supply?

THe best ones I found so far are ones from Zetex that can tolerate 40V or 60V but require a 5V supply and one from Analog Devices that can use a 3.3V supply but can only tolerate up to 28V.

 

[nickelflippr]

Just thinking out loud, but in lieu of the current sense amp IC, would a PGA (MCP6S21) do the job?

 

[dknguyen]

THat would only work low-side. Low side amps aren't a problem since then there is no requirement for high common mode voltage. I need high-side.

 

[Leftyretro]

DOes anyone know of a high side current sense amplifier IC that can tolerate common mode sense voltage up to 42V, but can be powered by a 3.3V supply?

THe best ones I found so far are ones from Zetex that can tolerate 40V or 60V but require a 5V supply and one from Analog Devices that can use a 3.3V supply but can only tolerate up to 28V.

Try here:

**broken link removed**

"There are numerous design advantages gained by selecting the high-side CSA architecture over a low-side CSA or a discrete solution. These include common-mode voltages of up to 76V, protection from shorts to ground, and the availability of a low-leakage shutdown mode of operation. "

**broken link removed**

"The MAX4073 operates from a +3V to +28V single supply and draws only 0.5mA of supply current. "

EDIT: Reading through data sheets it may be they can't do both your specs at the same time with any one specific device?

Lefty

 

[dknguyen]

Yeah, all the low supply voltage ones I can find only tolerate up to 28V common mode. I'm not sure if it's due to the technology or not.

THese are the only two 3V supply high side ones I've found (one from you) and they seem almost identical...

https://www.electro-tech-online.com/custompdfs/2008/12/ADM4073.pdf
https://www.electro-tech-online.com/custompdfs/2008/12/MAX4073-MAX4073T.pdf

Everything is exactly the same, package, specs listed, specs, down to the part names except the prefix matches the company that is selling it. Almost like a third party designed and made these and is selling them through these two companies and they copied off the same datasheet to make their own. How does stuff like that work with semiconductor companies?

 

[Leftyretro]

Yeah, all the low supply voltage ones I can find only tolerate up to 28V common mode. I'm not sure if it's due to the technology or not.

THese are the only two 3V supply high side ones I've found (one from you) and they seem almost identical...

https://www.electro-tech-online.com/custompdfs/2008/12/ADM4073-1.pdf
https://www.electro-tech-online.com/custompdfs/2008/12/MAX4073-MAX4073T-1.pdf

Everything is exactly the same, package, specs listed, specs, down to the part names except the prefix matches the company that is selling it. Almost like a third party designed and made these and is selling them through these two companies and they copied off the same datasheet to make their own. How does stuff like that work with semiconductor companies?

Not sure how it works. Could be one company owns the design but licences it to another. There was a time when a design company would not utilize a chip unless there was at least a second source of manufacturing for it. Now a days that general rule doesn't seem to be used as much.

Lefty

 

[Pesky Varmint]

Current sense IC

Try Texas Instruments:
INA193-INA195
INA138-INA168
INA139-INA169
INA170

Pesky Varmint