DIO2186

Version 1.0, Apr 2026

www.dioo.com

© 2026 Dioo Microcircuits Co., Ltd. Jiangsu

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9. Application Information

Important notice: Validation and testing are the most reliable ways to confirm system functionality. The

application information is not part of the specification and is for reference purposes only.

The DIO2186 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 DIO2186 makes it usable over a

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

9.1. Basic connections

The device should be positioned in close proximity to the current sense resistor, with the input pins (IN+ and

IN-) connected to the current sense resistor using Kelvin connections.

To minimize ground offset errors between the device and the analog-to-digital converter (ADC), the REF

pin should be connected to the ADC reference input. When interfacing with SAR ADCs, it is recommended

to filter or buffer the DIO2186 output before directly connecting it to the ADC.

Figure 12. Basic connections

9.2. RShunt and device gain selection

The accuracy of a current-sense amplifier is optimized by selecting the current-sense resistor with the

largest possible value. Increasing the sense resistor increases the differential input signal for a given

current, thereby minimizing the impact of offset voltage errors. Nevertheless, there are still practical

constraints, for example, the resistor physical size and maximum allowable power dissipation will limit the

maximum resistor value in some specific applications. The maximum current-sense resistor value based on

the power dissipation budget can be defined by the equation:

2

MAX

MAX

Shunt

I

PD

R



(2)

Where:

PDMAX is the maximum allowable power dissipation in RShunt.

IMAX is the maximum current that will flow through RShunt.

Another constraint on the current-sense resistor value and device gain is involved with the power-supply

voltage VS, as well as the device’s output swing-to-rail limitations. To ensure accurate current-sense signal