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.