RSHUNT

±ILOAD

VBUS

+

IN+

IN-

REF

OUT

+

Bandgap

V+

VCC

VREF

VBIAS

VIN

EN

GND

GND

VOUT

REF19xx

INA213B

+

±

+

±

ADC

VREF

17

REF1925, REF1930, REF1933, REF1941

www.ti.com

SBOS697A – SEPTEMBER 2014 – REVISED JANUARY 2017

Product Folder Links: REF1925 REF1930 REF1933 REF1941

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Copyright © 2014–2017, Texas Instruments Incorporated

10 Applications 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. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

The low-drift, bidirectional, single-supply, low-side, current-sensing solution described in this section can

accurately detect load currents from –2.5 A to 2.5 A. The linear range of the output is from 250 mV to 2.75 V.

Positive current is represented by output voltages from 1.5 V to 2.75 V, whereas negative current is represented

by output voltages from 250 mV to 1.5 V. The difference amplifier is the INA213 current-shunt monitor, whose

supply and reference voltages are supplied by the low-drift REF1930.

10.2 Typical Application

Figure 45. Low-Side, Current-Sensing Application