INA190-Q1, 40V, bi-directional, ultra-precise current sense amplifier

20 February, 2021

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The INA190-Q1 is an automotive, low-power, voltage-output, current-shunt monitor (also called a current-sense amplifier). This device is commonly used for monitoring systems directly connected to an automotive 12-V battery. The INA190-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 42 V.

Features

Low Supply Voltage, VVS: 1.7V to 5.5V
Wide Common-Mode Voltage: –0.2V to +40V
Low Shutdown Current: 100nA (Max)
Low Input Bias Currents: 500pA (Typ) (Enables Microamp Current Measurement)
Low Offset Voltage, VOS: ±15 µV (Max)
Accuracy:
- Gain Error: ±0.2% (A1 Devices)
- Offset Drift: 0.13µV/°C (Max)
- Gain Drift: 5ppm/°C (Max)
Gain Options:
- INA190A1: 25V/V
- INA190A2: 50 V/V
- INA190A3: 100V/V
- INA190A4: 200V/V
- INA190A5: 500V/V
Quiescent Current: 50µA at 25°C (Typ)
Package: 1.8mm x 1.4mm UQFN-10

The low input bias current of the device 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 INA190-Q1 operates from a single 1.7-V to 5.5-V power supply and draws a maximum of 65 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 an SC70 package.

more information: https://www.ti.com/product/INA190-Q1

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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