INA381 Low-/High-Side Voltage Output CSA with Comp

By Texas Instruments 67

INA381 Low-/High-Side Voltage Output CSA with Comp

Texas Instruments' 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 (max.)
    • Offset voltage, VCM = 0 V: 150 µV (max.)
    • Offset voltage drift: 1 µV/°C (max.)
    • Gain error: 1% (max.)
    • Gain error drift: 20 ppm/°C (max.)
  • Open-drain comparator output with latching mode
  • Package: WSON-8 (2 mm x 2 mm)
  • 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

Applications
  • Overcurrent protection
  • Power-supply protection
  • Low-side phase motor control
  • Computers and servers
  • Telecom equipment

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