Overview
The INA190A1IDCKR 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 requiring overcurrent protection, system optimization, and closed-loop feedback circuits. The INA190A1IDCKR 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 100 nA. It supports input common-mode voltages from –0.2 V to +40 V, making it suitable for both high-side and low-side current sensing.
Key Specifications
| Parameter | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage (VS) | 1.7 | 5.5 | V | ||
| Quiescent Current | At 25°C | 50 | 65 | µA | |
| Shutdown Current | 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 | 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 device operates with a low quiescent current of 50 µA at 25°C and a shutdown current of 100 nA.
- High Accuracy: Features a low offset voltage of ±15 µV and a gain error of ±0.2% for the A1 device, ensuring precise current measurements.
- Wide Common-Mode Voltage Range: Supports input common-mode voltages from –0.2 V to +40 V, independent of the supply voltage.
- Bidirectional Current Sensing: Capable of sensing current in both directions.
- High Common-Mode Rejection: Offers a common-mode rejection ratio of 132 dB, allowing it to reject changes in the dc common-mode voltage effectively.
- 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 disabled, reducing the supply current to less than 0.1 µA.
Applications
- Standard Notebook PC: Used for power management and current sensing.
- 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 monitoring.
- 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 INA190A1IDCKR?
The INA190A1IDCKR operates from a single 1.7-V to 5.5-V power supply.
- What is the typical quiescent current of the INA190A1IDCKR at 25°C?
The typical quiescent current is 50 µA at 25°C.
- What is the shutdown current of the INA190A1IDCKR?
The shutdown current is 100 nA.
- What is the common-mode rejection ratio (CMRR) of the INA190A1IDCKR?
The CMRR is 132 dB.
- What is the offset voltage (VOS) of the INA190A1IDCKR?
The offset voltage is ±15 µV.
- What are the gain options available for the INA190A1IDCKR?
The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the common-mode voltage range supported by the INA190A1IDCKR?
The device supports input common-mode voltages from –0.2 V to +40 V.
- Can the INA190A1IDCKR be used for both high-side and low-side current sensing?
Yes, it can be used for both high-side and low-side current sensing due to its wide common-mode voltage range.
- What is the purpose of the enable pin on the INA190A1IDCKR?
The enable pin allows the device to be disabled, reducing the supply current to less than 0.1 µA.
- In what types of applications is the INA190A1IDCKR typically used?
It is typically used in applications such as standard notebook PCs, smartphones, consumer battery chargers, baseband units, and server power supply units.
