Overview
The INA190A5IRSWR is a bidirectional, low-power, zero-drift, wide dynamic range current-sense amplifier produced by Texas Instruments. This device is designed for precise current measurement and is commonly used in applications such as overcurrent protection, system optimization, and closed-loop feedback circuits. The INA190A5IRSWR operates from a single 1.7-V to 5.5-V power supply and features low quiescent current, making it suitable for battery-powered and portable electronic systems. It supports input common-mode voltages from –0.2 V to +40 V, independent of the supply voltage, and offers five fixed gain options: 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
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 (IQDIS) | VENABLE = 0 V, VSENSE = 0 mV | 10 | 100 | nA | |
| 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 | |
| Gain Error | A1 device, VOUT = 0.1 V to VS – 0.1 V | –0.04% | ±0.2% | % | |
| Gain Options | 25 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V | V/V | |||
| Operating Temperature Range | –40 | +125 | °C | ||
| Package Options | UQFN (10), SC70 (6), SOT-23 (8) |
Key Features
- Low Power Consumption: The device operates with a low supply voltage (1.7 V to 5.5 V) and draws a maximum of 65 µA of supply current when enabled, and only 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.
- Low Input Bias Current: The device has very low input bias current, allowing the use of larger current-sense resistors and accurate measurements in the microamp range.
- Bidirectional Current Sensing: Capable of sensing current flow in both directions, achieved by applying a voltage at the REF pin.[
- High Common-Mode Rejection Ratio (CMRR): Typically 150 dB, which helps in rejecting changes in the dc common-mode voltage.[
- Rail-to-Rail Output Swing: The output voltage can swing close to the supply rail and ground, maximizing the usable output range.[
- Enable Pin: Features an enable pin that allows the device to be turned off when not needed, reducing power consumption to less than 0.1 µA.[
Applications
- Standard Notebook PC: Used for power management and current monitoring in notebook PCs.
- Smartphone: Utilized in smartphones for battery management and current sensing.
- Consumer Battery Charger: Employed in battery chargers to monitor and control charging currents.
- Baseband Unit (BBU): Used in telecommunications equipment for current monitoring and management.
- Merchant Network and Server PSU: Applied in power supply units for servers and network equipment to ensure efficient current management.
- Battery Test: Used in battery testing equipment to measure and analyze battery performance.
Q & A
- What is the operating voltage range of the INA190A5IRSWR?
The INA190A5IRSWR operates from a single 1.7-V to 5.5-V power supply.
- What are the available gain options for the INA190A5IRSWR?
The device offers five fixed gain options: 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the typical quiescent current of the INA190A5IRSWR when enabled?
The typical quiescent current is 65 µA when enabled.[
- How does the enable pin function in the INA190A5IRSWR?
The enable pin allows the device to be turned off when not needed, reducing the supply current to less than 0.1 µA.[
- What is the common-mode rejection ratio (CMRR) of the INA190A5IRSWR?
The CMRR is typically 150 dB.[
- Can the INA190A5IRSWR measure bidirectional current flow?
Yes, the device can sense current flow in both directions by applying a voltage at the REF pin.[
- What are the package options available for the INA190A5IRSWR?
The device is offered in UQFN (10), SC70 (6), and SOT-23 (8) packages.[
- What is the operating temperature range of the INA190A5IRSWR?
The operating temperature range is from –40°C to +125°C.[
- How does the low input bias current benefit the INA190A5IRSWR?
The low input bias current reduces the current consumed by the device, allows the use of input filters without affecting accuracy, and enables the use of larger current-sense resistors for accurate microamp current measurements.[
- What is the significance of the low offset voltage in the INA190A5IRSWR?
The low offset voltage (±15 µV) improves accuracy at light loads and allows for smaller sense resistors with lower power loss, enhancing power efficiency.[
