1 Features

1• 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)

2 Applications

• Electric Power Steering (EPS) Systems

• Body Control Modules

• Brake Systems

• Electronic Stability Control (ESC) Systems

3 Description

The INA138-Q1 and INA168-Q1 (INA1x8-Q1) devices

are high-side, unidirectional, current sense amplifiers.

Wide input common-mode voltage range, low

quiescent current, and TSSOP and SOT-23

packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are

independent, and range from 2.7 V to 36 V for the

INA138-Q1, and 2.7 V to 60 V for the INA168-Q1.

Quiescent current is only 25 μA, which permits

connecting the power supply to either side of the

current-measurement shunt with minimal error.

The device converts a differential input voltage to a

current output. This current is converted 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 in measurement and level

shifting.

Both devices are available in a TSSOP-8 package.

The INA168-Q1 is also available in a SOT-23-5

package. Both devices are specified for the –40°C to

+125°C temperature range.