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LMP8640: IN+/IN- voltage when power up

Part Number: LMP8640
Other Parts Discussed in Thread: INA281

hi team,

as my customer use LMP8640 to sense the NVDIMM P12V power, they find, when the LMP8640 is powered up by a +5V/0V, their is a about 1.375V volts on the IN+/IN- pin, when the Vbus is not present(I mean the Rshunt is not powered by external source).

Could I know if the 1.375V is normal? if so, could you please share me the reason? maybe a block diagram for the internal amplifier?

And if so, could I know if all our current sense devices are like this? if some one can block such a volt like a bias voltage? Thanks!


Robin Liu