1

2

3

5

4

GND

IN-

IN+

Curren t

Sen se

OUT

VS

Directio n Curr ent Flow

VIA to Gro und

Plan e

VS: 2.7 V to 5.5 V

24

INA180, INA2180

SBOS741A – APRIL 2017 – REVISED AUGUST 2017

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Product Folder Links: INA180 INA2180

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Copyright © 2017, Texas Instruments Incorporated

11 Layout

11.1 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.

11.2 Layout Example

Figure 45. Recommended Layout