INA186 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range,

Current-Sense Amplifier With Enable

1 Features

• Wide common-mode voltage range, VCM:

–0.2 V to +40 V

• Low input bias currents, IIB: 500 pA (typical)

(enables microamp current measurement)

• Low power:

– Low supply voltage, VS: 1.7 V to 5.5 V

– Low quiescent current, IQ: 48 µA (typical)

• Accuracy:

– Common-mode rejection ratio: 120 dB

(minimum)

– Gain error, EG: ±1% (maximum)

– Gain drift: 10 ppm/°C (maximum)

– Offset voltage, VOS: ±50 μV (maximum)

– Offset drift: 0.5 μV/°C (maximum)

• Bidirectional current sensing capability

• Gain options:

– INA186A1: 25 V/V

– INA186A2: 50 V/V

– INA186A3: 100 V/V

– INA186A4: 200 V/V

– INA186A5: 500 V/V

2 Applications

• Standard notebook PC

• Smartphone

• Consumer battery charger

• Baseband unit (BBU)

• Merchant network and server PSU

• Battery test

3 Description

The INA186 is a low-power, voltage-output, current-

sense amplifier (also called a current-shunt monitor).

This device is commonly used for overcurrent

protection, precision current measurement for system

optimization, or in closed-loop feedback circuits. The

INA186 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 INA186 permits the

use of larger current-sense resistors, thus providing

accurate current measurements in the microamp

range. The low offset voltage of the zero-drift

architecture extends the dynamic range of the current

measurement. This feature allows for smaller sense

resistors with lower power loss, while still providing

accurate current measurements.

The INA186 operates from a single 1.7-V to 5.5-V

power supply, and draws a maximum of 90 μA of

supply current . Five fixed gain options are available:

25 V/V, 50 V/V, 100 V/V, 200 V/V, or 500 V/V. The

device is specified over the operating temperature

range of –40°C to +125°C, and offered in SC70,

SOT-23-THIN, and DSBGA packages. The SC70 and

SOT-23 (DDF) packages support bidirectional current

measurement, whereas the DSBGA package only

supports current measurement in one direction.

Table 3-1. Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA186

SC70 (6)

2.00 mm × 1.25 mm

SOT-23 (8)

2.90 mm × 1.60 mm

DSBGA (6)

1.17 mm × 0.765 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

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

RSENSE

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.

Typical Application

INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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. PRODUCTION DATA.