INA186A1IDDFT datasheet(25/46 Pages) TI

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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. 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

as possible. The input filter capacitor CF should be placed as close as possible to the input pins of the device.

10.2 Layout Examples

REF

GND

OUT

IN-

IN+

Supply Voltage

(1.7 V to 5.5 V)

CBYPASS

VIA to Ground Plane

INA186

RSHUNT

Note: RF and CF are optional in low

noise/ripple environments

Current Sense

Output

VIA to Ground Plane

Connect REF to GND for

Unidirectional Measurement

or to External Reference for

Bidirectional Measurement

Figure 10-1. Recommended Layout for SC70 (DCK) Package

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INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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INA186A1IDDFT Datasheet(PDF) 25 Page - Texas Instruments