INA186-Q1 AEC-Q100, 40-V, Bidirectional, High-Precision Current Sense Amplifier

With picoamp IB and ENABLE

1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Wide common-mode voltage range, VCM:

–0.2 V to +40 V with survivability up to 42

V (recommended for automotive 12-V battery

applications)

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

• 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-Q1: 25 V/V

– INA186A2-Q1: 50 V/V

– INA186A3-Q1: 100 V/V

– INA186A4-Q1: 200 V/V

– INA186A5-Q1: 500 V/V

2 Applications

• Body control module (BCM)

• Telematics control unit

• Emergency call (eCall)

• 12-V battery management system (BMS)

• Automotive head unit

3 Description

The INA186-Q1 is an automotive, low-power, voltage-

output, current-sense amplifier (also called a current-

shunt monitor). This device is commonly used

for monitoring systems directly connected to an

automotive 12-V battery. The INA186-Q1 can sense

drops across shunts at common-mode voltages from

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

In addition, the input pins have an absolute maximum

voltage of 42V.

The low input bias current of the INA186-Q1

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-Q1 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 (5), and SOT-23 (8) packages. The SC70

and SOT-23 (DDF) packages supports bidirectional

current measurement, whereas the SOT-23 (DBV)

only supports current measurement in one direction.

Table 3-1. Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA186-Q1

SC70 (6)

2.00 mm × 1.25 mm

SOT-23 (5)

2.90 mm × 1.60 mm

SOT-23 (8)

2.90 mm × 1.60 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

ADC

ENABLE

(2)

VS

OUT

REF

(1)

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-Q1

CBYPASS

(1) The REF pin is available in

SC70 and DDF packages

(2) The ENABLE pin is available

only in the DDF package.

Typical Application

INA186-Q1

SBOS386B – MAY 2019 – REVISED MARCH 2022

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.