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. To compensate for noisy or high-impedance

power supplies, add more decoupling capacitance.

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

10.2 Layout Examples

Current

Sense Output

VIA to Ground

Plane

(1)

(1)

(1)

Connect to Supply

(1.7 V to 5.5 V)

Connect to Control or VS

(Do not float)

IN±

IN+

OUT

GND

VS

ENABLE

B1

B2

B3

A1

A2

A3

Figure 10-1. Recommended Layout DSBGA (YFD) Package

INA191, INA2191

SLYS020B – FEBRUARY 2019 – REVISED FEBRUARY 2021

www.ti.com

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