INA2191A1IYBJR

Overview

The INA2191A1IYBJR is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It operates with a supply voltage of 1.7 V to 5.5 V and supports common-mode voltages from -0.2 V to +40 V. The device features a fixed gain of 25 V/V, a maximum gain error of ±0.25%, and a typical input bias current of 3 nA. Key electrical parameters include an offset voltage of ±12 µV max, a bandwidth of 45 kHz, and a quiescent current of 96 µA at 1.8 V. It is housed in a DSBGA-12 package.

Feature Summary

• Dual-channel architecture supporting independent bidirectional current sensing for each channel via dedicated reference pins.
• Ultra-low input bias current enables accurate microamp-level measurements and allows the use of larger sense resistors.
• Zero-drift architecture provides low offset voltage and drift, extending dynamic range and improving light-load accuracy.
• Integrated enable functionality reduces supply current to negligible levels when disabled.

Applications

• Notebook computers
• Cell phones
• Battery-powered devices
• Telecom equipment
• Power management

Procurement Notes

Verify the specific suffix IYBJR corresponds to the DSBGA-12 package and A1 gain variant (25 V/V). Confirm RoHS compliance status as indicated in official documentation. Ensure the source document matches the manufacturer's production data sheet for the INAx191 family to validate all electrical specifications and pin configurations.

Selection Notes

Select this component for applications requiring dual-channel bidirectional monitoring with high precision. The 25 V/V gain is suitable for detecting small voltage drops across shunt resistors. Consider the DSBGA-12 package size constraints and the requirement for external reference voltages on REF1 and REF2 pins to establish the bidirectional output baseline.

Part Context

This part belongs to the INAx191 family of ultra-precise current sense amplifiers. Unlike the single-channel INA191, the INA2191 integrates two channels in a compact footprint. The 'A1' designation specifies the 25 V/V gain option, while 'IYBJR' identifies the industrial temperature range, DSBGA-12 package, and reel packaging format.

Replacement Considerations

INA2191A2IYBJR: Same package and temperature range but with 50 V/V gain.

FAQ

How is bidirectional sensing achieved?

Bidirectional sensing is enabled by applying an external reference voltage to the REF1 and REF2 pins. The output voltage is centered around these reference levels rather than ground.

What is the function of the ENABLE pins?

Driving the ENABLE pins to VS turns the respective channels on. Driving them to GND disables the channels, placing outputs in a high-impedance state and reducing quiescent current.