INA169NA/250

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1. Description

The INA169NA/250 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/250 and 2.7 V to 60 V for the INA169NA/250. 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. INA169NA/250 are available in 5-pin SOT-23 packages. The INA169NA/250 device is specified for the –40°C to +125°C temperature range, and the INA169NA/250 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