Overview
The INA381A4IDSGT from Texas Instruments is a high-speed, current-sensing amplifier integrated with a comparator, designed for precise and efficient current measurement and overcurrent protection. This device is part of the INA381 family and is specifically the INA381A4 variant, offering a gain of 200 V/V. It operates within a wide common-mode voltage range of –0.2 V to +26 V, making it suitable for both high-side and low-side current-sensing applications. The INA381A4IDSGT is powered by a single supply voltage ranging from 2.7 V to 5.5 V and is specified over an operating temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VS) | 2.7 to 5.5 | V |
| Common-Mode Input Range | –0.2 to +26 | V |
| Offset Voltage at TA = 25°C | 150 µV (max at VCM = 0 V), 500 µV (max at VCM = 12 V) | µV |
| Gain Error | ±1% | % |
| Gain Error Drift | 20 ppm/°C (max) | ppm/°C |
| Bandwidth (INA381A4) | 105 kHz | kHz |
| Slew Rate | 2 V/µs | V/µs |
| Comparator Propagation Delay | 0.4 to 2 µs | µs |
| Comparator Hysteresis | 50 mV | mV |
| Operating Temperature Range | –40 to +125 | °C |
| Package Type | WSON-8 |
Key Features
- High Accuracy Amplifier: Low offset voltage of 150 µV (max at VCM = 0 V) and 500 µV (max at VCM = 12 V), with a temperature contribution of 1 µV/°C.
- Wide Common-Mode Input Range: Supports input common-mode voltages from –0.2 V to +26 V, independent of the supply voltage.
- Integrated Comparator: With a propagation delay of 0.4 to 2 µs and hysteresis of 50 mV, allowing for quick detection of overcurrent events.
- High Bandwidth and Slew Rate: Small-signal bandwidths up to 105 kHz and large-signal slew rates of 2 V/µs.
- Low Power Consumption: Operates with a maximum supply current of 350 µA.
- Flexible Alert Modes: Supports transparent and latched modes for the alert output.
Applications
- Merchant Network and Server Power Supplies: For overcurrent protection and monitoring.
- Merchant DC/DC Converters: To ensure reliable and efficient power conversion.
- DC-Input BLDC Motor Drives: For precise current sensing and control in motor applications.
- Cordless Power Tools: To monitor and protect against overcurrent conditions.
- Headsets, Headphones, and Earbuds: For battery and power management.
Q & A
- What is the common-mode input range of the INA381A4IDSGT?
The common-mode input range is from –0.2 V to +26 V.
- What are the available gain options for the INA381 family?
The INA381 family offers gains of 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- What is the maximum supply voltage for the INA381A4IDSGT?
The maximum supply voltage is 5.5 V.
- What is the typical propagation delay of the integrated comparator?
The typical propagation delay is 0.4 to 2 µs.
- Can the INA381A4IDSGT be used in both high-side and low-side current-sensing applications?
- What is the maximum operating temperature of the INA381A4IDSGT?
The maximum operating temperature is +125°C.
- What is the package type of the INA381A4IDSGT?
The package type is WSON-8.
- What is the maximum input offset voltage at TA = 25°C?
The maximum input offset voltage is 150 µV at VCM = 0 V and 500 µV at VCM = 12 V.
- How does the integrated comparator contribute to the device's functionality?
The integrated comparator allows for quick detection of overcurrent events by comparing the sensed voltage to a user-defined threshold.
- What are some typical applications of the INA381A4IDSGT?
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.
