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, voltageoutput,

current-sense amplifier (also called a currentshunt

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 zerodrift

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.