INA169NA/3KG4

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1. Description

The INA169NA/3KG4 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 INA169NA and 2.7 V to 60 V for the INA169NA. 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 INA169NA and INA169NA are available in 5-pin SOT-23 packages. The INA169NA device is specified for the –40°C to +125°C temperature range, and the INA169NA is specified from –40°C to +85°C.

2. Features

   1. Complete Unipolar High-Side Current Measurement Circuit

   2. Wide Supply and Common-Mode Range

   3. INA139: 2.7 V to 40 V

   4. INA169: 2.7 V to 60 V

   5. Independent Supply and Input Common-Mode Voltages

   6. Single Resistor Gain Set

   7. Low Quiescent Current: 60 µA (Typical)

   8. 5-Pin, SOT-23 Packages

3. Applications

   1. Current Shunt Measurement:

       – Automotive

       – Telephone

       – Computers

   2. Portable and Battery-Backup Systems

   3. Battery Chargers

   4. Power Management

   5. Cell Phones

   6. Precision Current Source

4. Pin Configuration and Functions

5. Typical Application Circuit