The INA181-Q1, INA2181-Q1, and INA4181-Q1 (INAx181-Q1) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181-Q1 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched 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-channel INA181-Q1 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181-Q1 draws a maximum supply current of 500 µA, and the quad-channel INA4181-Q1 draws a maximum supply current of 900 µA.
The INA181-Q1 is available in a 6-pin, SOT-23 package. The INA2181-Q1 is available in an 10-pin, VSSOP package. The INA4181-Q1 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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|Common Mode Voltage (Max) (V)|
|Common Mode Voltage (Min) (V)|
|Input Offset (+/-) (Max) (uV)|
|Input Offset Drift (+/-) (Typ) (uV/C)|
|Gain Error (%)|
|Gain Error Drift (Max) (ppm/°C)|
|CMRR (Min) (dB)|
|Supply Voltage (Max) (V)|
|Supply Voltage (Min) (V)|
|Iq (Max) (mA)|
|Number of Channels (#)|
|Operating Temperature Range (C)|
|Package Size: mm2:W x L (PKG)|
|-40 to 125||-40 to 125|
|VSSOP | 10||TSSOP | 20|
|10VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 10)||20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)|
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