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 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 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. 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

(1)

VS

OUT

REF

(2)

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

(1) The ENABLE pin is available only

in the DDF and YFD packages.

(2) The REF pin is available only in

the DDF and DCK packages.

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 before connecting directly to the ADC.

Figure 8-1. Basic Connections

INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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