8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The INA190-EP amplifies the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground. The high common-mode rejection of the INA190-EP make it usable over a wide

range of voltage rails while still maintaining an accurate current measurement.

8.1.1 Basic Connections

Figure 8-1 shows the basic connections of the INA190-EP. Place the device as close as possible to the

current sense resistor and connect the input pins (IN+ and IN–) to the current sense resistor through kelvin

connections.If present, the ENABLE pin must be controlled externally or connected to VS if not used.

ADC

ENABLE

VS

OUT

REF

GND

IN+

IN–

LOAD

Microcontroller

Supply Voltage

1.7 V to 5.5 V

Bus Voltage

–0.2 V to +40 V

0.5 nA

(typ)

0.5 nA

(typ)

0.1 μF

INA190-EP

NOTE: To help eliminate ground offset errors between the device and the analog-to-digital converter (ADC), connect the REF pin to the

ADC reference input. When driving SAR ADCs, filter or buffer the output of the INA190-EP before connecting directly to the ADC.

Figure 8-1. Basic Connections for the INA190-EP

INA190-EP

SBOSA74 – MAY 2022

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Product Folder Links: INA190-EP