AD8219

Rev. 0 | Page 12 of 16

APPLICATIONS INFORMATION

HIGH-SIDE CURRENT SENSING

In this configuration, the shunt resistor is referenced to the

battery (see Figure 28). High voltage is present at the inputs

of the current sense amplifier. When the shunt is battery

referenced, the AD8219 produces a linear ground referenced

analog output.

+IN

SHUNT

GND

–IN

4V

TO

80V

AD8219

OUT

LOAD

Figure 28. Battery Referenced Shunt Resistor

positive input (+IN) pin. In this mode, the internal LDO powers

the AD8219 as long as the common-mode voltage at the input

standalone supply that can vary from 4 V to 80 V as shown in

Figure 29.

+IN

SHUNT

GND

–IN

AD8219

OUT

4V

TO

80V

4V

TO

80V

LOAD

Figure 29. Standalone Supply Operation

MOTOR CONTROL CURRENT SENSING

The AD8219 is a practical, accurate solution for high-side

current sensing in motor control applications. In cases where

the shunt resistor is referenced to a battery and the current

flowing is unidirectional (as shown in Figure 30), the AD8219

monitors the current with no additional supply pin necessary

provided the battery voltage in the following circuit is in the 4 V

to 80 V range.

+IN

GND

–IN

BATTERY

MOTOR

AD8219

OUT

Figure 30. High-Side Current Sensing in Motor Control