INA381

Product Folder Order Now Technical Documents Tools & Software Support & Community INA381 SBOS848B – DECEMBER 2017 – REVISED OCTOBER 2019 INA381 26-V, High-Speed, Current Sense Amplifier With Integrated Comparator 1 Features 1 Common-mode input range: –0.2 V to +26 V High accuracy amplifier: – Offset voltage at TA = 25°C – 500 µV (maximum) at VCM = 12 V – 150 µV (maximum) at VCM = 0 V – Offset voltage drift: 1 µV/°C (maximum) – Gain error: 1% (maximum) at 25°C – 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 Open-drain comparator: – Hysteresis: 50 mV – Propagation delay: 400 ns (typ) – Alert threshold set through external reference voltage – Supports transparent and latching modes Packages: VSSOP-10 and WSON-8 2 Applications Merchant network and server PSU Merchant DC/DC DC-input BLDC motor drive Cordless power tool Headsets, headphones and earbuds 3 Description The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on commonmode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage. The open-drain alert output can be co...