INA381 26V current sense amplifier with integrated over-current comparator for cost-sensitive applications | TI.com

INA381 (ACTIVE) 26V current sense amplifier with integrated over-current comparator for cost-sensitive applications

 

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