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INA210: Is there any risk to leave current flow Rsense while doesn't power V+?

Mingmo Zhu
Prodigy 540 points
Part Number: INA210
Other Parts Discussed in Thread: INA212

Hello there,

We use INA210 for current sensing. In some case we will shutdown the INA210 by disconnecting V+, I wonder is it ok if there is current flowing through the Rsense when no power V+? is there any risk to damage the IC? let's say max current 4.8A, Rsense 2mR.

Thanks.

Mingmo

  • 0
    TI__Mastermind 32395 points
    Hello Mingmo,

    Thank you reaching out on the forum to get best experience with our devices.

    The answer to your question is that it is OK and acceptable to disconnect V+ pin with current still flowing through Rsense. According to the Absolute Maximum Ratings Table 6.1 in datasheet, the input differential voltage in between IN+ and IN- can be anywhere from +26V and -26V and the part will incur no damage. In your case the input differential voltage is 4.8A*0.002mΩ = 9.6mV so this is fine.

    For your information we have an application note describing the operation of INA212 (same family as INA210) when floating the V+ pin to turn off power. Here is the document.
    www.ti.com/.../sboa180a.pdf

    Hope this helps,
    Peter Iliya
    Current Sensing Applications
  • 0 in reply to Peter Iliya
    TI__Prodigy 540 points
    Hello Peter,
    I see. Thank you.
    Best regards.