The INA181, INA2181,and INA4181 (INAx181) currentsense amplifiers are designed for cost-optimized applications. These devices are part of a familyof bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltagedrops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent ofthe supply voltage. The INAx181 family integrates a matchedresistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. Thismatched gain resistor network minimizes gain error and reduces the temperature drift.
These devices operate from a single 2.7-V to 5.5-V power supply. The single-channelINA181A3IDBVT draws a maximum supply current of 260 μA; whereas, thedual-channel INA2181 draws a maximum supply current of 500 μA, andthe quad-channel INA4181 draws a maximum supply current of 900μA.
The INA181A3IDBVT is available in a 6-pin, SOT-23 package. TheINA2181 is available in an 10-pin, VSSOP package. The INA4181 is available in a 20-pin, TSSOP package. All device options arespecified over the extended operating temperature range of –40°C to +125°C.
Feature
- Common-mode range (VCM): –0.2 Vto +26 V
- High bandwidth: 350 kHz (A1 Devices)
- Offset voltage:
- ±150 μV (Max) at VCM = 0 V
- ±500 μV (Max) at VCM = 12 V
- Output slew rate: 2 V/μs
- Bidirectional current-sensingcapability
- Accuracy:
- ±1% gain error (max)
- 1-μV/°C offset drift (max)
- Gain options:
- 20 V/V (A1 devices)
- 50 V/V (A2 devices)
- 100 V/V (A3 devices)
- 200 V/V (A4 devices)
- Quiescent current: 260 μA max (INA181)
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