INA180A2IDBVT datasheet(28/51 Pages) TI1

28 / 51 page

GND

IN±

IN+

Current

Sense

OUT

RSHUNT

Direction Current Flow

VIA to Ground

Plane

Power Supply, VS:

2.7 V to 5.5 V

CBYPASS

Bus Voltage:

±0.2 V to +26 V

INA180, INA2180, INA4180

SBOS741G – APRIL 2017 – REVISED APRIL 2020

www.ti.com

Product Folder Links: INA180 INA2180 INA4180

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Common-Mode Transients Greater Than 26 V (continued)

For a reference design example, see Current Shunt Monitor With Transient Robustness Reference Design.

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.

•

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

as possible in order to minimize any impedance mismatch.

11.2 Layout Examples

Figure 51. Single-Channel Recommended Layout (Pinout A)

INA180A2IDBVT Datasheet(PDF) 28 Page - Texas Instruments