Overview
The INA381A4IDSGR is a high-performance current sense amplifier produced by Texas Instruments. This device combines a 26-V common-mode current-sensing amplifier with a high-speed comparator, making it ideal for overcurrent detection and protection in various applications. The INA381A4IDSGR operates from a single 2.7-V to 5.5-V supply and is capable of measuring differential voltage signals across a wide common-mode voltage range of –0.2 V to 26 V, independent of the supply voltage. Its zero-drift topology ensures high-precision measurements with low offset voltage and minimal temperature drift.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VS) | 2.7 to 5.5 | V |
| Common-Mode Voltage Range | –0.2 to 26 | V |
| Gain (INA381A4) | 200 V/V | |
| Offset Voltage at 25°C | ≤ 150 µV | V |
| Gain Error at 25°C | ±1% | |
| Gain Error Drift | 20 ppm/°C | |
| Bandwidth (INA381A4) | 105 kHz | |
| Slew Rate | 2 V/µs | |
| Comparator Propagation Delay | 0.4 to 2 µs | |
| Operating Temperature Range | –40°C to +125°C | |
| Package Options | VSSOP-10, WSON-8 |
Key Features
- High Accuracy: Low offset voltage (≤ 150 µV) and minimal temperature drift (1 µV/°C) ensure precise current measurements.
- Wide Common-Mode Voltage Range: Supports input common-mode voltages from –0.2 V to 26 V, independent of the supply voltage.
- Integrated Comparator: High-speed comparator with hysteresis (50 mV) and propagation delay as low as 0.4 µs for quick overcurrent detection.
- Flexible Alert Modes: Transparent and latched modes for the alert output, allowing for different system responses to overcurrent conditions.
- High Bandwidth and Slew Rate: Supports small-signal bandwidths up to 350 kHz and large-signal slew rates of 2 V/µs for rapid current changes detection.
- Low Power Consumption: Operates with a maximum supply current of 350 µA.
Applications
- Merchant Network and Server Power Supplies: For overcurrent protection and monitoring in high-reliability power supply systems.
- DC/DC Converters: To monitor and protect against overcurrent conditions in DC/DC conversion applications.
- DC-Input BLDC Motor Drives: For precise current sensing and overcurrent protection in motor control systems.
- Cordless Power Tools: To ensure safe and efficient operation by monitoring and protecting against overcurrent conditions.
- Headsets, Headphones, and Earbuds: For current sensing and protection in portable audio devices.
Q & A
- What is the operating supply voltage range of the INA381A4IDSGR?
The INA381A4IDSGR operates from a single 2.7-V to 5.5-V supply.
- What is the common-mode voltage range supported by the INA381A4IDSGR?
The device supports input common-mode voltages from –0.2 V to 26 V.
- What is the gain of the INA381A4IDSGR?
The gain of the INA381A4IDSGR is 200 V/V.
- What is the offset voltage of the INA381A4IDSGR at 25°C?
The offset voltage is ≤ 150 µV at 25°C.
- What is the propagation delay of the integrated comparator?
The propagation delay of the comparator is 0.4 to 2 µs.
- What are the available package options for the INA381A4IDSGR?
The device is available in VSSOP-10 and WSON-8 packages.
- What is the operating temperature range of the INA381A4IDSGR?
The device operates over a temperature range of –40°C to +125°C.
- How does the INA381A4IDSGR support overcurrent detection?
The device includes an integrated comparator that compares the sensed voltage to a user-defined threshold, providing an alert output in transparent or latched mode.
- What are some typical applications of the INA381A4IDSGR?
Typical applications include merchant network and server power supplies, DC/DC converters, DC-input BLDC motor drives, cordless power tools, and headsets, headphones, and earbuds.
- What is the maximum supply current of the INA381A4IDSGR?
The maximum supply current is 350 µA.
