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1. Description
The INA139 and INA169NA/3K 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.
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
5. Pin Functions
6. Package outline
