Overview
The INA190A3IDDFR, produced by Texas Instruments, is a low-power, voltage-output, current-shunt monitor. 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. It is available in various packages, including SOT-23, SC70, and UQFN, and is specified over an operating temperature range of –40°C to +125°C.
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 (CMRR) | 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 | |||
| Common-Mode Voltage Range | –0.2 | 40 | V | ||
| Gain Options | 25, 50, 100, 200, 500 | V/V |
Key Features
- Low Power Consumption: The INA190 draws a maximum of 65 µA of supply current when enabled and less than 0.1 µA when disabled.
- High Accuracy: Features low gain error (±0.2% for A1 device) and low offset voltage (±15 µV), ensuring precise current measurements.
- Wide Common-Mode Voltage Range: Operates with 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 directions.
- High Common-Mode Rejection Ratio (CMRR): Typically 150 dB, allowing for accurate measurements despite changes in the dc common-mode voltage.
- Rail-to-Rail Output Swing: The output can swing close to the supply rail and ground, maximizing the usable output range.
- Enable Pin: Allows the device to be disabled, reducing the supply current to less than 0.1 µA.
Applications
- Standard Notebook PC: Used for power management and current monitoring.
- Smartphone: Employed in battery management and power optimization.
- Consumer Battery Charger: Utilized for precise current measurement and overcurrent protection.
- Baseband Unit (BBU): Applied in telecommunications equipment for current sensing.
- Merchant Network and Server PSU: Used in power supply units for data centers and servers.
- Battery Test: Used in battery testing and monitoring systems.
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 typical quiescent current of the INA190?
The typical quiescent current is 50 µA at 25°C.
- What is the maximum shutdown current of the INA190?
The maximum shutdown current is 0.1 µA when the device is disabled.
- What is the common-mode rejection ratio (CMRR) of the INA190?
The CMRR is typically 150 dB.
- What is the offset voltage of the INA190?
The offset voltage is ±15 µV.
- What are the gain options available for the INA190?
The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- Can the INA190 be used for high-side and low-side current sensing?
- What is the output swing capability of the INA190?
The output can swing close to the supply rail and ground, with a maximum specified output swing to the positive rail of VS – 40 mV and to GND + 1 mV.
- What are some typical applications of the INA190?
Typical applications include standard notebook PCs, smartphones, consumer battery chargers, baseband units, merchant network and server PSUs, and battery testing.
- What is the operating temperature range of the INA190?
The operating temperature range is –40°C to +125°C.
