INA301 Current-Sensing Amplifiers

INA301 Current-Sensing Amplifiers

Texas Instruments' INA301 includes both high common-mode, current-sensing amplifiers and high-speed comparators configured to detect overcurrent conditions. This is done by measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. These devices feature an adjustable limit threshold range that is set using a single external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert outputs can be configured to operate either in 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. These devices' alert response time is under 1 µs, allowing for quick detection of overcurrent events.

These devices operate from a single 2.7 V to 5.5 V supply, drawing a maximum supply current of 700 µA. They are specified over the extended operating temperature range (-40°C to 125°C) and are available in an 8-pin VSSOP package.

Features
  • Wide common-mode input range: 0 V to 36 V
  • Dual output: amplifier and comparator output
  • High accuracy amplifier:
    • Offset voltage: 35 µV (max)
    • Offset voltage drift: 0.5 µV/°C (max)
    • Gain error: 0.1% (max)
    • Gain error drift: 10 ppm/°C
  • Programmable alert threshold set through a single resistor
  • Available amplifier gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Total alert response time: 1 µs
  • Open-drain output with latching mode
  • Package: VSSOP-8
Manufacturer