INA181 (ACTIVE)

26V, Bidirectional, Low- or High-Side Voltage Output Current Sense Amplifier

26V, Bidirectional, Low- or High-Side Voltage Output Current Sense Amplifier - INA181
 

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, and 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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Parametrics Compare all products in Current Sense Amplifiers Analog Output

 
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 (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Gain Error Drift (Max) (ppm/°C)
INA181 INA180 INA199 INA2181 INA4181
26    26    26    26    26   
-0.2    -0.2    -0.1    -0.2    -0.2   
150    150    150    150    150   
0.2    0.2    0.1    0.2    0.2   
20
50
100
200   
20
50
100
200   
50
100
200   
20
50
100
200   
100
20
200
50   
1    1    1    1    1   
84    84    100    84    84   
350
210
150
105   
350
210
150
105   
80
30
14   
350
210
150
105   
350
210
150
105   
5.5    5.5    26    5.5    5.5   
2.7    2.7    2.7    2.7    2.7   
0.3    0.3    0.115    0.5    1   
Bi-directional
Low-side Capable   
Low-side Capable    Bi-directional
Low-side Capable   
Bi-directional
Dual channel
Low-side Capable   
Bi-directional
Low-side Capable
Quad channel   
Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
SOT-23    SOT-23    SC70
UQFN   
VSSOP    TSSOP   
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SC70: 4 mm2: 2.1 x 2(SC70)
10UQFN: 3 mm2: 1.4 x 1.8(UQFN)   
10VSSOP: 15 mm2: 4.9 x 3(VSSOP)    20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)   
20    20    10    20    20   

INA181 Error Analysis

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