INA296A datasheet(26/43 Pages) TI

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9.3 Power Supply Recommendations

The INA296x makes accurate measurements beyond the connected power-supply voltage (VS) because the

inputs (IN+ and IN–) can operate anywhere between –5 V and +110 V independent of VS. For example, with the

VS power supply equal to 5 V, the common-mode voltage of the measured shunt can be as high as +110 V.

9.3.1 Power Supply Decoupling

Place the power-supply bypass capacitor as close to the supply and ground pins as possible. TI recommends a

bypass capacitor value of 0.1 μF. Additional decoupling capacitance can be added to compensate for noisy or

high-impedance power supplies.

9.4 Layout

9.4.1 Layout Guidelines

Attention to good layout practices is always recommended.

• 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 sense resistor, any additional high-current carrying impedance

can cause significant measurement errors.

• Place the power-supply bypass capacitor as close to the device power supply and ground pins as possible.

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.

9.4.2 Layout Examples

OUT

IN-

IN+

CBYPASS

INA Device

RSHUNT

VIA to Ground Plane

GND

REF1

VIA to Ground Plane

REF2

VIA to Power Supply

VIA to Ground Plane

Figure 9-3. INA296x SOT-23 (DDF), SOIC (D) and VSSOP (DGK) Package Recommended Layout

INA296A, INA296B

SBOSA04C – MARCH 2022 – REVISED OCTOBER 2023

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INA296A Datasheet(PDF) 26 Page - Texas Instruments