1 Features

1• Complete Unipolar High-Side Current

Measurement Circuit

• Wide Supply and Common-Mode Range

• INA139: 2.7 V to 40 V

• INA169: 2.7 V to 60 V

• Independent Supply and Input Common-Mode

Voltages

• Single Resistor Gain Set

• Low Quiescent Current: 60 μA (Typical)

• 5-Pin, SOT-23 Packages

2 Applications

• Current Shunt Measurement:

– Automotive, Telephone, Computers

• Portable and Battery-Backup Systems

• Battery Chargers

• Power Management

• Cell Phones

• Precision Current Source

3 Description

The INA139 and INA169 are high-side, unipolar,

current shunt monitors. Wide input common-mode

voltage range, high-speed, low quiescent current, and

tiny SOT-23 packaging enable use in a variety of

applications.

Input common-mode and power-supply voltages are

independent and can range from 2.7 V to 40 V for the

INA139 and 2.7 V to 60 V for the INA169. Quiescent

current is only 60 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 the INA139 and INA169 are available in 5-pin

SOT-23 packages. The INA139 device is specified for

the –40°C to +125°C temperature range, and the

INA169 is specified from –40°C to +85°C.