ADC

ENABL E

VS

OUT

GND

IN+

IN±

LOA D

Microco ntr oller

Sup ply Vo ltag e

1.7 V to 5.5 V

100 pA

(typ)

100 pA

(typ)

0.1 …F

TI-Device

TM

Bus Voltage

up to +40 V

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

INA191

SLYS020 – FEBRUARY 2019

INA191 Low-supply, voltage-output, low-side or high-side measurement,

zero-drift series, current-shunt monitor

1

1 Features

1

•

•

Wide common-mode voltage: –0.2 V to +40 V

•

Low shutdown current: 100 nA (max)

•

Low input bias currents: 500 pA (typ)

•

(enables shunt drops of 10-mV full-scale)

•

Accuracy:

–

±0.3% gain error (max over temperature)

–

0.13-μV/°C offset drift (max)

–

7-ppm/°C gain drift (max)

•

Gain options:

–

INA191A1: 25 V/V

–

INA191A2: 50 V/V

–

INA191A3: 100 V/V

–

INA191A4: 200 V/V

–

INA191A5: 500 V/V

•

Quiescent current: 45 μA at 25°C (typ)

•

DSBGA package

2 Applications

•

Notebook computers

•

Cell phones

•

Battery-powered devices

•

Telecom equipment

•

Power management

•

Battery chargers

3 Description

The INA191 is a voltage-output, current-shunt monitor

(also

called

a

current-sense

amplifier)

that

is

commonly used for overcurrent protection, precision-

current measurement for system optimization, or in

closed-loop feedback circuits. This device can sense

drops across shunts at common-mode voltages from

–0.2 V to +40 V, independent of the supply voltage.

The low input bias current of the INA191 permits the

use of larger current-sense resistors, thus providing

accurate current measurements in the µA range. Five

fixed gains are available: 25 V/V, 50 V/V, 100 V/V,

200 V/V, or 500 V/V. The low offset voltage of the

zero-drift architecture extends the dynamic range of

the current measurement allowing for smaller sense

resistors with lower power loss while still providing

accurate current measurements.

These devices operate from a single 1.7-V to 5.5-V

power supply, drawing a maximum of 65 µA of supply

current when enabled and only 100 nA when

disabled. All devices are specified over the extended

operating temperature range of –40°C to +125°C, and

are offered in a DSBGA-6 package..

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA191

DSBGA (6)

1.17 mm × 0.765 mm

(1) For all available packages, see the package option addendum

at the end of the datasheet.

Simplified Schematic