10 Power Supply Recommendations

The device is powered from the IN+ pin with a voltage from 2.7 V to 26 V. The voltage at the output will also

be limited by this voltage during overload or fault conditions. Also, the INA183 can withstand the full input signal

range up to 26 V on the IN– pin, regardless of whether the device has power applied or not.

11 Layout

11.1 Layout Guidelines

• Connect the input pins to the sensing resistor using a kelvin or 4-wire connection. This connection technique

ensures 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 IN+ pin and ground pins. TI

recommends using a bypass capacitor with a value of 0.1 μF. Additional decoupling capacitance can be

added to compensate for noisy or high-impedance power supplies.

11.2 Layout Example

CBYPASS

Current Sense

Output

RSHUNT

LOAD

Direction of

Current Flow

VIA to Ground

Plane

Bus Voltage:

2.7 V to 26 V

OUT

GND

IN-

IN+

GND

Figure 11-1. Recommended Layout

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INA183

SBOSA08 – FEBRUARY 2021

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Product Folder Links: INA183