Summary of INA190-Q1 – 40V, BI-DIRECTIONAL, ULTRA-PRECISE CURRENT SENSE AMPLIFIER
The INA190-Q1 is an automotive, low-power, voltage-output current-shunt monitor for 12-V systems, sensing shunt drops with common-mode voltages from −0.2 V to +40 V (42 V absolute max). It features low input bias (typ 500 pA), low supply (1.7–5.5 V) and quiescent current (50 µA), zero-drift low offset for wide dynamic range, bidirectional sensing, high accuracy (±0.2% gain error A1, 5 ppm/°C gain drift, ±15 µV offset), and multiple fixed gains from 25 V/V to 500 V/V. AEC-Q100 qualified for −40°C to +125°C.
Parts used in the INA190-Q1 project:
- INA190-Q1 current-shunt monitor (device)
- Current-sense resistor (shunt)
- Power supply 1.7 V to 5.5 V (VS)
- Automotive 12-V battery or system (common-mode source)
- PCB and connectors for mounting
- Bypass and decoupling capacitors (for supply stability)
- Optional input protection components to meet 42 V absolute max
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.
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.
Features
- AEC-Q100 qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, TA
- Low input bias currents: 500 pA (typ)
(enables microamp current measurement) - Low power:
- Low supply voltage, VS: 1.7 V to 5.5 V
- Low quiescent current: 50 µA at 25°C (typ)
- Accuracy:
- Gain error: ±0.2% (A1 device)
- Gain drift: 5 ppm/°C (max)
- Offset voltage, VOS: ±15 µV (max)
- Offset drift: 0.13 µV/°C (max)
- Wide common-mode voltage: –0.2 V to +40 V with survivability up to 42 V
- Bidirectional current sensing capability
- Gain options:
- INA190A1-Q1: 25 V/V
- INA190A2-Q1: 50 V/V
- INA190A3-Q1: 100 V/V
- INA190A4-Q1: 200 V/V
- INA190A5-Q1: 500 V/V
Read more: INA190-Q1 – 40V, BI-DIRECTIONAL, ULTRA-PRECISE CURRENT SENSE AMPLIFIER
- What is the common-mode voltage range of the INA190-Q1?
The INA190-Q1 senses common-mode voltages from −0.2 V to +40 V and has input survivability up to 42 V. - Can the INA190-Q1 be used in automotive 12-V systems?
Yes, the device is commonly used for monitoring systems directly connected to an automotive 12-V battery and is AEC-Q100 qualified. - What supply voltage does the INA190-Q1 require?
The INA190-Q1 operates from a supply voltage VS of 1.7 V to 5.5 V. - Does the INA190-Q1 support bidirectional current sensing?
Yes, the INA190-Q1 provides bidirectional current sensing capability. - What are the available gain options for the INA190-Q1?
Available gains are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. - How low is the input bias current of the INA190-Q1?
The typical input bias current is 500 pA, enabling microamp current measurement. - What is the quiescent current of the INA190-Q1?
The typical quiescent current is 50 µA at 25°C. - What accuracy specifications does the INA190-Q1 provide?
Accuracy includes ±0.2% gain error for A1 devices, maximum 5 ppm/°C gain drift, and maximum ±15 µV offset voltage.
