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INA228: Location of VBUS input in circuit (supply side, load side, or either)?

Tom Warner1
Intellectual 275 points
Part Number: INA228


Hi - 

For the INA228 VBUS input, can this input be used in the circuit on the load side of the measurement?

I assume the answer is yes, but I wanted to confirm.

My application is a high-side, unidirectional power measurement.  But, I'm more interested in the voltage at the load side (i.e. after the shunt resistor) on the IN- input.  In fact, my plans are to place this VBUS input trace as close to the supply pin of the device I'm measuring as possible.  In other words, the INA228 will be close to the upstream switching regulator where the IN+ and IN- pins will be used to measure the current, but the VBUS measurement will be a trace that travels a few inches to reach the supply voltage pin of my device.  In this way, I hope to measure the voltage my device is seeing without having to factor in the IR drop in the board from the supply.

Does this align with TI's guidance?

Thanks,

Tom