Overview
The INA190A4IDCKR is a low-power, voltage-output, current-shunt monitor produced by Texas Instruments. This device is designed for precision current measurement and is commonly used in applications requiring overcurrent protection, system optimization, or closed-loop feedback circuits. The INA190 operates from a single 1.7-V to 5.5-V power supply and features a low quiescent current of 50 µA at 25°C, with a shutdown current as low as 0.1 µA. It supports input common-mode voltages from –0.2 V to +40 V, independent of the supply voltage, making it versatile for high-side and low-side current sensing.
Key Specifications
| Parameter | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage | 1.7 | 5.5 | V | ||
| Quiescent Current | VS = 1.8 V to 5.0 V, TA = 25°C | 50 | 65 | µA | |
| Shutdown Current | VENABLE = 0 V | 0.1 | µA | ||
| Common-Mode Rejection Ratio | VSENSE = 0 mV, VIN+ = –0.1 V to 40 V, TA = –40°C to +125°C | 132 | 150 | dB | |
| Offset Voltage, VOS | VS = 1.8 V, VSENSE = 0 mV | -3 | ±15 | µV | |
| Offset Drift, dVOS/dT | VSENSE = 0 mV, TA = –40°C to +125°C | 80 | nV/°C | ||
| Gain Error | A1 device | ±0.2% | % | ||
| Gain Drift | 7 | ppm/°C | |||
| Gain Options | 25, 50, 100, 200, 500 | V/V | |||
| Operating Temperature Range | -40 | 125 | °C | ||
| Package Options | UQFN, SC70, SOT-23 |
Key Features
- Low Power Consumption: The device operates with a low quiescent current of 50 µA at 25°C and a shutdown current of 0.1 µA.
- High Accuracy: Features low offset voltage (±15 µV) and low gain error (±0.2% for A1 device), ensuring precise current measurements.
- Wide Common-Mode Range: Supports input common-mode voltages from –0.2 V to +40 V, independent of the supply voltage.
- Bidirectional Current Sensing: Capable of sensing currents in both high-side and low-side configurations.
- High Common-Mode Rejection: Offers a common-mode rejection ratio of up to 150 dB, ensuring minimal impact from changes in the dc common-mode voltage.
- Rail-to-Rail Output Swing: Allows linear current-sensing operation with the output close to the supply rail and ground.
- Multiple Gain Options: Available in five fixed gain options: 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
Applications
- Standard Notebook PC: Used for precision current measurement and overcurrent protection.
- Smartphone: Utilized in battery management and power optimization.
- Consumer Battery Charger: Ensures accurate current measurement and protection during charging cycles.
- Baseband Unit (BBU): Employed in telecommunications equipment for current monitoring.
- Merchant Network and Server PSU: Used in power supply units for data centers and servers.
- Battery Test: Essential for precise current measurement in battery testing applications.
Q & A
- What is the operating voltage range of the INA190?
The INA190 operates from a single 1.7-V to 5.5-V power supply.
- What is the quiescent current of the INA190 at 25°C?
The quiescent current is typically 50 µA at 25°C.
- What is the shutdown current of the INA190?
The shutdown current is less than 0.1 µA when the device is disabled.
- What is the common-mode rejection ratio of the INA190?
The common-mode rejection ratio is typically 150 dB.
- What are the gain options available for the INA190?
The INA190 is available in five fixed gain options: 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the operating temperature range of the INA190?
The operating temperature range is from –40°C to +125°C.
- What are the package options for the INA190?
The device is offered in UQFN, SC70, and SOT-23 packages.
- Can the INA190 be used for both high-side and low-side current sensing?
- What is the significance of the low offset voltage in the INA190?
The low offset voltage (±15 µV) improves the accuracy of current measurements, especially at light loads, and allows for the use of lower-value shunt resistors, reducing power loss.
- How does the INA190 handle changes in the dc common-mode voltage?
The INA190 features high common-mode rejection, blocking dc common-mode voltages and ensuring minimal impact on the offset voltage.
