INA381 26V, Low-/High-Side, Voltage Output CSA with Comparator | TI.com

INA381 (ACTIVE)

26V, Low-/High-Side, Voltage Output CSA with Comparator

26V, Low-/High-Side, Voltage Output CSA with Comparator - INA381
Datasheet
INA381 26-V, Zero-Drift, Voltage-Output, Current-Shunt Monitor With Integrated Comparator datasheet (Rev. A)
 

Description

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-shunt resistor and comparing that voltage to a defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The standalone comparator alert response time is under 3 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection provided by the INA381 is under 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin WSON package.







Features

  • Common-Mode Input Range: –0.2 V to 26 V
  • High Accuracy Amplifier:
    • Offset Voltage, VCM = 12 V: 500 µV (Maximum)
    • Offset Voltage, VCM = 0 V: 150 µV (Maximum)
    • Offset Voltage Drift: 1 µV/°C (Maximum)
    • Gain Error: 1% (Maximum)
    • Gain Error Drift: 20 ppm/°C (Maximum)
  • Available Amplifier Gains:
    • INA381A1: 20 V/V
    • INA381A2: 50 V/V
    • INA381A3: 100 V/V
    • INA381A4: 200 V/V
  • Comparator Specifications:
    • Hysteresis: 50 mV
    • Response Time: 500 ns
    • Alert Threshold Set Through External Reference Voltage
  • Open-Drain Comparator Output With Latching Mode
  • Package: WSON-8 (2 mm × 2 mm)

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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 (%)
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)
INA381 INA302 INA303
26     36     36    
-0.2     0     0    
150     30
50
80    		 30
50
80    
0.2     0.1     0.1    
100
20
200
50    		 100
20
50    		 100
20
50    
1     0.1
0.15
0.2    		 0.1
0.15
0.2    
20     10     10    
84     100     100    
350
210
150
105    		 550
440
400    		 550
500
450    
5.5     5.5     5.5    
2.7     2.7     2.7    
0.5     1.1     1.1    
1     1     1    
1     2     2    
Alert Function
Low-side Capable    		 Alert Function
Bi-directional
Low-side Capable    		 Alert Function
Bi-directional
Low-side Capable    
Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125    
WSON | 8     TSSOP | 14     TSSOP | 14    
See datasheet (WSON)     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)    

Design tool

INA381 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
2.7 ≤ 
V ≤ 36
0 ≤ 
V ≤ 36
-40 ≤ 
C ≤ 125