INA381 (ACTIVE)

Current Sense Amplifier With Integrated Over-Current Comparator

Current Sense Amplifier With Integrated Over-Current Comparator - INA381
 

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 with Comparator

 
Common Mode Voltage (Max) (V)
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/C)
Gain (V/V)
Gain Error (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Number of Channels (#)
Response Time (Typ) (µs)
Hysteresis Input (Typ) (mV)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Features
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Common Mode Voltage (Min) (V)
Gain Error Drift (Max) (ppm/°C)
INA381 INA302 INA303
26    36    36   
150    30
50
80   
30
50
80   
0.2    0.1    0.1   
20
50
100
200   
20
50
100   
20
50
100   
1    0.1
0.15
0.2   
0.1
0.15
0.2   
84    100    100   
350    550
440
400   
550
500
450   
1    2    2   
10    1    1   
50    100    100   
5.5    5.5    5.5   
2.7    2.7    2.7   
0.5    1.1    1.1   
Alert Function
Low-side Capable   
Alert Function
Bi-directional
Low-side Capable   
Alert Function
Bi-directional
Low-side Capable   
-40 to 125    -40 to 125    -40 to 125   
WSON    TSSOP    TSSOP   
See datasheet (WSON)    14TSSOP: 32 mm2: 6.4 x 5(TSSOP)    14TSSOP: 32 mm2: 6.4 x 5(TSSOP)   
-0.2    0    0   
20    10    10