INA186-Q1

• AEC-Q100 qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Wide common-mode voltage range, V_CM:
  –0.2 V to +40 V with survivability up to 42 V (recommended for automotive 12-V battery applications)
• Low input bias currents, I_IB: 500 pA (typical)
• Low power:
  • Low supply voltage, V_S: 1.7 V to 5.5 V
  • Low quiescent current, I_Q: 48 µA (typical)
• Accuracy:
  • Common-mode rejection ratio: 120 dB (minimum)
  • Gain error, E_G: ±1% (maximum)
  • Gain drift: 10 ppm/°C (maximum)
  • Offset voltage, V_OS: ±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

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, and SOT-23 packages. The SC70 package supports bidirectional current measurement, whereas the SOT-23 (DBV) only supports current measurement in one direction.