INA138-Q1 - AEC-Q100, 36V, High-Side, Current Output Current Sense Amplifier

The INA138-Q1 and INA168-Q1 (INA1x8-Q1) devices are high-side, unidirectional, currentsense amplifiers. Wide input common-mode voltage range, low quiescent current, and TSSOP and SOT-23packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent, and range from 2.7 V to 36 Vfor the INA138-Q1, and 2.7 V to 60 V for the INA168-Q1. Quiescent current is only 25 µA, whichpermits connecting the power supply to either side of the current-measurement shunt with minimalerror.

The device converts a differential input voltage to a current output. This current isconverted back to a voltage with an external load resistor that sets any gain from 1 to over 100.Although designed for current shunt measurement, the circuit invites creative applications inmeasurement and level shifting.

Both devices are available in a TSSOP-8 package. The INA168-Q1 is also available in aSOT-23-5 package. Both devices are specified for the –40°C to +125°C temperature range.

• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
  • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
  • Device HBM ESD Classification Level 2
  • Device CDM ESD Classification Level C6
• Complete Unipolar High-Side Current-Measurement Circuit
• Wide Supply and Common-Mode Ranges:
  • INA138-Q1: 2.7 V to 36 V
  • INA168-Q1: 2.7 V to 60 V
• Independent Supply and Input Common-Mode Voltages
• Single Resistor Gain Set
• Low Quiescent Current (25 µA Typical)
• Wide Temperature Range: –40°C to +125°C
• Packages: TSSOP-8, SOT-23-5 (INA168-Q1)

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