Overview
The INA381A2IDGSR is a high-performance current sense amplifier with an integrated high-speed comparator, designed and manufactured by Texas Instruments. This device is capable of detecting overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing it to a user-defined threshold limit set by the comparator reference pin. It operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA, and is specified over an operating temperature range of –40°C to +125°C. The INA381A2IDGSR is available in 10-pin VSSOP and 8-pin WSON packages, making it suitable for both high-side and low-side current-sensing applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VSSOP-10, WSON-8 | - |
| Pins | 10 (VSSOP), 8 (WSON) | - |
| Operating Temperature Range | –40 to 125 | °C |
| Supply Voltage | 2.7 to 5.5 | V |
| Maximum Supply Current | 350 | µA |
| Common-Mode Input Range | –0.2 to +26 | V |
| Offset Voltage at 25°C | 150 µV (max at VCM=0V), 500 µV (max at VCM=12V) | µV |
| Offset Voltage Drift | 1 µV/°C (max) | µV/°C |
| Gain Error at 25°C | 1% (max) | % |
| Gain Error Drift | 20 ppm/°C (max) | ppm/°C |
| Amplifier Gain (INA381A2) | 50 V/V | V/V |
| Comparator Hysteresis | 50 mV | mV |
| Comparator Propagation Delay | 400 ns (typ) | ns |
Key Features
- High accuracy amplifier with low offset voltage (150 µV max at VCM=0V, 500 µV max at VCM=12V) and low drift (1 µV/°C max).
- Available amplifier gains: 20 V/V, 50 V/V, 100 V/V, and 200 V/V (INA381A2 has a gain of 50 V/V).
- Open-drain comparator with hysteresis (50 mV) and propagation delay (400 ns typ).
- Supports transparent and latching modes for the alert output.
- Wide common-mode input range from –0.2 V to +26 V, independent of the supply voltage.
- Compact packages: VSSOP-10 and WSON-8.
- Low power consumption with a maximum supply current of 350 µA.
- High-temperature operation up to 125°C.
Applications
- Merchant network and server power supplies.
- Merchant DC/DC converters.
- DC-input BLDC motor drives.
- Cordless power tools.
- Headsets, headphones, and earbuds.
- General current monitoring and protection in various industrial and consumer electronics.
Q & A
- Q: What is the operating temperature range of the INA381A2IDGSR?
A: The operating temperature range is –40°C to +125°C.
- Q: What are the available package options for the INA381A2IDGSR?
A: The device is available in 10-pin VSSOP and 8-pin WSON packages.
- Q: What is the supply voltage range for the INA381A2IDGSR?
A: The supply voltage range is 2.7 V to 5.5 V.
- Q: What is the maximum supply current of the INA381A2IDGSR?
A: The maximum supply current is 350 µA.
- Q: What is the common-mode input range of the INA381A2IDGSR?
A: The common-mode input range is from –0.2 V to +26 V.
- Q: What are the amplifier gain options for the INA381 series?
A: The available amplifier gains are 20 V/V, 50 V/V, 100 V/V, and 200 V/V (INA381A2 has a gain of 50 V/V).
- Q: How does the comparator in the INA381A2IDGSR operate?
A: The comparator operates in either transparent or latched mode, with a propagation delay of 400 ns (typ) and hysteresis of 50 mV.
- Q: What are some typical applications of the INA381A2IDGSR?
A: 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.
- Q: How accurate is the current measurement provided by the INA381A2IDGSR?
A: The device offers high accuracy with an offset voltage as low as 150 µV and a gain error of 1% (max) at 25°C.
- Q: Can the INA381A2IDGSR be used in both high-side and low-side current-sensing applications?
A: Yes, the device can be used in both high-side and low-side current-sensing applications due to its wide common-mode input range.
