Overview
The INA190A1IRSWT, produced by Texas Instruments, is a low-power, voltage-output, current-shunt monitor (also known as a current-sense amplifier). This device is designed for precise power management applications, offering high accuracy and low power consumption. It is commonly used for overcurrent protection, precision current measurement for system optimization, and in closed-loop feedback circuits. The INA190A1IRSWT operates from a single supply voltage of 1.7 V to 5.5 V and features a low quiescent current of 50 µA at 25°C. It supports bidirectional current sensing and has a wide common-mode voltage range of –0.2 V to +40 V, independent of the supply voltage.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VS) | 1.7 | 5.5 | V | |
| Quiescent Current (IQ) | 50 | 65 | µA | |
| Shutdown Current | 100 | nA | ||
| Common-Mode Rejection Ratio (CMRR) | 132 | 150 | dB | |
| Offset Voltage (VOS) | -3 | 15 | µV | |
| Offset Drift | 80 | nV/°C | ||
| Gain Error | ±0.2% | |||
| Gain Drift | 7 ppm/°C | |||
| Common-Mode Voltage Range | -0.2 | 40 | V | |
| Gain Options | 25, 50, 100, 200, 500 | V/V | ||
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- Low Power Consumption: Low supply voltage (1.7 V to 5.5 V) and low quiescent current (50 µA at 25°C).
- High Accuracy: Low offset voltage (±15 µV), low offset drift (80 nV/°C), and high common-mode rejection ratio (132 dB min).
- Bidirectional Current Sensing: Capable of sensing current in both directions.
- Wide Common-Mode Voltage Range: –0.2 V to +40 V, independent of the supply voltage.
- Gain Options: Available in five fixed gain options: 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- Low Input Bias Current: Enables microamp current measurement with low input bias currents (500 pA typ).
- Enable Pin: Allows the device to be disabled, reducing supply current to less than 0.1 µA.
- Rail-to-Rail Output Swing: Linear current-sensing operation with output close to the supply rail and ground.
Applications
- Standard Notebook PC: For precise current measurement and overcurrent protection.
- Smartphone: To manage power efficiently and protect against overcurrent conditions.
- Consumer Battery Charger: For accurate current sensing and system optimization.
- Baseband Unit (BBU): In telecommunications equipment for precise power management.
- Merchant Network and Server PSU: For reliable and efficient power supply management.
- Battery Test: To measure and monitor battery performance accurately.
Q & A
- What is the operating supply voltage range of the INA190A1IRSWT?
The INA190A1IRSWT operates from a single supply voltage of 1.7 V to 5.5 V.
- What is the typical quiescent current of the INA190A1IRSWT?
The typical quiescent current is 50 µA at 25°C.
- What is the common-mode rejection ratio (CMRR) of the INA190A1IRSWT?
The CMRR is 132 dB minimum.
- What are the gain options available for the INA190A1IRSWT?
The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the operating temperature range of the INA190A1IRSWT?
The operating temperature range is –40°C to +125°C.
- Can the INA190A1IRSWT be used for bidirectional current sensing?
Yes, the INA190A1IRSWT is capable of bidirectional current sensing.
- What is the typical input bias current of the INA190A1IRSWT?
The typical input bias current is 500 pA.
- How does the enable pin function on the INA190A1IRSWT?
The enable pin allows the device to be disabled, reducing the supply current to less than 0.1 µA.
- What is the common-mode voltage range of the INA190A1IRSWT?
The common-mode voltage range is –0.2 V to +40 V.
- What are some typical applications of the INA190A1IRSWT?
Typical applications include standard notebook PCs, smartphones, consumer battery chargers, baseband units, and server power supplies.
