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INA180: INA180 high end current sensing

Ranjeet Malhotra
Prodigy 85 points
Part Number: INA180

Tool/software:

Hi,

We are planning to use INA180A1DBVR for high end current sensing of 12V rail. The 12V is taken to a DC-DC convertor which generates 3V3 to the system.

The IN+/IN- of INA180A1DBVR are connected across the current sense resistor  on the 12V rail. When the DUT is powered the IN+/IN- of the device will see a voltage before the device itself

will get power on the Vs pin. The datasheet seems to suggest this is ok to do so - but can I get a confirmation that it is ok to supply common mode 12V to the IN+/IN- lines when the device itself is not powered?

thanks

  • 0
    Guru 297090 points

    Yes; the absolute maximum ratings allow up to 26 V at the inputs under all circumstances. Also see figure 7.21.

  • 0 in reply to Clemens Ladisch
    TI__Genius 14840 points

    Clemens, 

    Thank you for your correct reply per usual. 

    Hello Ranjeet,

    Thank you for your post; Clemens is correct as this device can withstand your 12V present on the inputs before the supply is on for the device. This is a robust device and I completely understand the need for confirmation. 

    Best Regards, 

    Joe