Overview
The INA190A2IDCKR from Texas Instruments is a low-power, voltage-output, current-shunt monitor designed for precise current measurement and overcurrent protection. This device is part of the INA190 family, which features a zero-drift architecture, enabling accurate current measurements across a wide dynamic range. It operates from a single 1.7-V to 5.5-V power supply and is capable of sensing drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage. The INA190A2IDCKR is particularly useful in applications requiring bidirectional current sensing and low quiescent current, making it suitable for various electronic systems including portable devices, consumer electronics, and industrial equipment.
Key Specifications
| Parameter | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage (VS) | 1.7 | 5.5 | V | ||
| Quiescent Current (IQ) | VS = 1.8 V, VSENSE = 0 mV | 48 | 65 | 90 | µA |
| Shutdown Current | VENABLE = 0 V | 10 | 100 | nA | |
| Common-Mode Rejection Ratio (CMRR) | VSENSE = 0 mV, VIN+ = –0.1 V to 40 V | 132 | 150 | dB | |
| Offset Voltage (VOS) | VS = 1.8 V, VSENSE = 0 mV | –3 | ±15 | µV | |
| Gain Error | ±0.2% | ||||
| Gain Drift | 7 ppm/°C | ||||
| Gain Option (INA190A2) | 50 V/V | ||||
| Operating Temperature Range | –40 | +125 | °C | ||
| Package Options | SC70, SOT-23, UQFN |
Key Features
- Low Power Consumption: Low supply voltage (1.7 V to 5.5 V) and low quiescent current (48 µA typical at 25°C).
- High Accuracy: Zero-drift architecture with low offset voltage (±15 µV max) and low gain drift (7 ppm/°C max).
- Wide Common-Mode Range: Operates with common-mode voltages from –0.2 V to +40 V.
- Bidirectional Current Sensing: Capable of measuring current in both directions through a resistive shunt.
- High Common-Mode Rejection: CMRR of 132 dB (min), allowing for accurate measurements in high and low voltage rails.
- Rail-to-Rail Output Swing: Output voltage can swing close to the supply rail and ground, maximizing the usable output range.
- Enable Pin: Allows the device to be turned off, reducing supply current to less than 0.1 µA when disabled.
Applications
- Standard Notebook PC: For power management and current monitoring.
- Smartphone: For battery management and power optimization.
- Consumer Battery Charger: For precise current measurement and overcurrent protection.
- Baseband Unit (BBU): For current monitoring in telecommunications equipment.
- Merchant Network and Server PSU: For power supply monitoring and optimization.
- Battery Test: For accurate current measurement during battery testing.
Q & A
- What is the supply voltage range of the INA190A2IDCKR? The supply voltage range is from 1.7 V to 5.5 V.
- What is the typical quiescent current of the INA190A2IDCKR? The typical quiescent current is 48 µA at 25°C.
- What is the common-mode rejection ratio (CMRR) of the INA190A2IDCKR? The CMRR is 132 dB (min).
- What is the offset voltage of the INA190A2IDCKR? The offset voltage is ±15 µV (max).
- What are the gain options available for the INA190 family? The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- Can the INA190A2IDCKR measure current in both directions? Yes, it is capable of bidirectional current sensing.
- What is the operating temperature range of the INA190A2IDCKR? The operating temperature range is from –40°C to +125°C.
- What packages are available for the INA190A2IDCKR? The device is available in SC70, SOT-23, and UQFN packages.
- How does the enable pin function on the INA190A2IDCKR? The enable pin allows the device to be turned off, reducing the supply current to less than 0.1 µA when disabled.
- What is the typical output leakage current when the device is disabled? The typical output leakage current is 10 nA when the device is disabled.
