Hi sir,
Could you let me know what is INA302-Q1 supply current consumption? My customer want to check their power design.
Thanks.
User,
The quiescent current for INA302-Q1 is given on page 6 of the datasheet:
User,
The quiescent current of the device is simply the current required to allow the device to function while in a powered state. You are correct this does not take the bias currents into account. A way to think about this would be its the current required to operate the device when VSENSE = 0. However, there is also a secondary set of bias currents, Ib+ and Ib-, that will flow into the input terminals of the device:
Current shunt amplifiers, when Vcm exceeds Vs, power themselves through the inputs of the device by drawing additional bias currents (notice the transition at 5V in the above figure). These currents will be present even when VSENSE = 0. They are further exacerbated by temperature (see figure 19 of the datasheet),
Also, when measuring a VSENSE > 0, there will also be additional current that flows into the device input terminals, given by figure 49 of the datasheet. However, most of this current is drawn to supply the output node with output current. and there is relatively small power loss compared to the above components.
So, for a better power analysis, your customer could calculate (Vs*Iq) + (VCM*2*Ib), where the second term would account for bias currents from figure 17 above based on the common mode they are operating at.
