INA2181 Dual Channel, 26V, Bi-Directional, Low-/High-Side Voltage Output Current Sense Amp | TI.com

INA2181
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Dual Channel, 26V, Bi-Directional, Low-/High-Side Voltage Output Current Sense Amp

 

Description

The INA181, INA2181, and INA4181 (INAx181) 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 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 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in a 6-pin, SOT-23 package. The INA2181 is available in an 10-pin, VSSOP package. The INA4181 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.

Features

  • Common-mode range (VCM): –0.2 V to +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-sensing capability
  • 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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INA2181 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
2.7 ≤ 
V ≤ 5.5
-0.2 ≤ 
V ≤ 26
-40 ≤ 
C ≤ 125

Parametrics

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Part number Order Common mode voltage (Max) (V) Common mode voltage (Min) (V) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Typ) (uV/C) Gain (V/V) Gain error (%) Gain error drift (+/-) (Max) (ppm/°C) CMRR (Min) (dB) Bandwidth (kHz) Supply voltage (Max) (V) Supply voltage (Min) (V) Iq (Max) (mA) Number of channels (#) Comparators (#) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
INA2181 Order now 26     -0.2     150     0.2     100
20
200
50    
1     20     84     350
210
150
105    
5.5     2.7     0.5     2     0     Bi-directional
Dual channel
Low-side Capable    
Catalog     -40 to 125     VSSOP | 10     10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10)    
INA181 Order now 26     -0.2     150     0.2     100
20
200
50    
1     20     84     350
210
150
105    
5.5     2.7     0.3     1     0     Bi-directional
Low-side Capable    
Catalog     -40 to 125     SOT-23 | 6     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
INA4181 Order now 26     -0.2     150     0.2     100
20
200
50    
1     20     84     350
210
150
105    
5.5     2.7     1     4     0     Bi-directional
Low-side Capable
Quad channel    
Catalog     -40 to 125     TSSOP | 20     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)