Description:

The INA186-Q1 is an automotive, low-power, voltage-output current sense amplifier (also known as a current shunt monitor). This device is commonly used to monitor systems directly connected to automotive 12V batteries. The INA186-Q1 can sense the voltage drop across a shunt resistor at common-mode voltages from –0.2V to +40V, 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 allows the use of large current sense resistors, enabling precise current measurement down to the microampere level. The low offset voltage of the zero-drift architecture extends the dynamic range of current measurement. This feature supports the use of smaller sense resistors while still providing accurate current measurement with lower power loss. The INA186-Q1 is powered from a single supply of 1.7V to 5.5V and consumes a maximum supply current of 90 μA when enabled. Five fixed gain options are available: 25V/V, 50V/V, 100V/V, 200V/V, or 500V/V. The device is rated for an operating temperature range of –40°C to +125°C and is available in SC70, SOT-23 (5), and SOT-23 (8) packages. The SC70 and SOT-23 (DDF) packages support bidirectional current measurement, while the SOT-23 (DBV) supports unidirectional current measurement only.

Features:

• AEC-Q100 qualified for automotive applications: – Temperature grade 1: –40°C to +125°C, TA

• Functional safety available – Documentation to aid in functional safety system design

• Wide common-mode voltage range VCM: –0.2V to +40V, capable of withstanding voltages up to 42V (recommended for automotive 12V battery applications)

• Low input bias current IIB: 500 pA (typical)

• Low power consumption:

– Low supply voltage VS: 1.7V to 5.5V

– 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: ±50μV (maximum)

– Offset drift: 0.5 μV/°C (maximum)

• Bidirectional current sensing capability

• Gain options:

– INA186A1-Q1: 25 V/V

– INA186A2-Q1: 50V/V

– INA186A3-Q1: 100V/V

– INA186A4-Q1: 200V/V

– INA186A5-Q1: 500V/V

Applications:

• Body control module (BCM)

• Telematics control unit

• Emergency call (eCall)

• 12V battery management system (BMS)

• Automotive audio head unit