Curren t

Sen se Ou tput

VIA to Gro und

Plan e

GND

IN-

IN+

OUT

VS

8

2

1

6

7

9

10

5

4

3

REF

ENABL E

NC

NC

NC

Conne ct to Supp ly

(1.7 V to 5.5 V)

Conne ct to Co ntr ol o r V S

(Do Not Flo at)

Conne ct REF to GND for

Unidire ctional Measuremen t

or to External Reference fo r

Bidi rection al Mea sur ement

noise/ripp le e nvi ronments

27

INA190

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SBOS863C – MARCH 2018 – REVISED APRIL 2019

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9 Power Supply Recommendations

can be 5 V, whereas the bus supply voltage at IN+ and IN– can be as high as 40 V. However, the output voltage

range of the OUT pin is limited by the voltage on the VS pin. The INA190 also withstands the full differential input

signal range up to 40 V at the IN+ and IN– input pins, regardless of whether the device has power applied at the

10 Layout

10.1 Layout Guidelines

•

Connect the input pins to the sensing resistor using a Kelvin or 4-wire connection. This connection technique

makes sure that only the current-sensing resistor impedance is detected between the input pins. Poor routing

of the current-sensing resistor commonly results in additional resistance present between the input pins.

Given the very low ohmic value of the current resistor, any additional high-current carrying impedance can

cause significant measurement errors.

•

Place the power-supply bypass capacitor as close as possible to the device power supply and ground pins.

The recommended value of this bypass capacitor is 0.1 µF. Additional decoupling capacitance can be added

to compensate for noisy or high-impedance power supplies.

•

When routing the connections from the current-sense resistor to the device, keep the trace lengths as short

10.2 Layout Example

Figure 46. Recommended Layout for UQFN (RSW) Package