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 INA186-Q1 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 INA186-Q1 makes 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 INA186-Q1. 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.

ADC

ENABLE

(2)

VS

OUT

REF

(1)

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 …F

INA186-Q1

(1) The REF pin is available in

SC70 and DDF packages

(2) The ENABLE pin is available

only in the DDF package.

A.

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 INA186-Q1 before connecting directly to the ADC.

Figure 8-1. Basic Connections

www.ti.com

INA186-Q1

SBOS386B – MAY 2019 – REVISED MARCH 2022

Copyright © 2022 Texas Instruments Incorporated

Submit Document Feedback

17

Product Folder Links: INA186-Q1