INA191 datasheet(29/42 Pages) TI2

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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

as possible. Place input filter capacitor CF as close as possible to the input pins of the device.

10.2 Layout Examples

Current

Sense Output

RSHUNT

VIA to Ground

Plane

CBYPASS

(1)

Connect to Supply

(1.7 V to 5.5 V)

Connect to Control or VS

(Do not float)

IN±

IN+

OUT

GND

ENABLE

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

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INA191, INA2191

SLYS020C – FEBRUARY 2019 – REVISED AUGUST 2021

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INA191 Arkusz danych(PDF) 29 Page - Texas Instruments