INA254A1IPWAR

Overview

The INA254A1IPWAR is a voltage-output current sense amplifier featuring an integrated 400-µΩ precision shunt resistor. It supports bidirectional current monitoring over a wide common-mode range of –4 V to +80 V, independent of the supply voltage. The device operates from a single 2.7-V to 5.5-V power supply with a maximum quiescent current of 2.4 mA. It utilizes a zero-drift chopped amplifier topology to provide calibration-equivalent measurement accuracy and ultra-low temperature drift performance. The specific A1 variant offers a fixed gain of 20 mV/A. It is housed in a 24-pin HTSSOP package.

Feature Summary

• Integrates a precision 400-µΩ shunt resistor with optimized Kelvin layout for high-accuracy measurements.
• Features enhanced PWM rejection circuitry to suppress large dv/dt signals during real-time continuous current measurements.
• Employs a zero-drift architecture to eliminate 1/f noise and ensure stable performance across extended temperature ranges.

Applications

• 48-V motor controls
• DC/DC converters
• Medical cordless tools
• Solenoid and actuators
• Remote I/O link control

Procurement Notes

Verify the specific ordering suffix IPWAR corresponds to the 24-pin HTSSOP package configuration. Confirm that the A1 designation matches the required 20 mV/A gain setting for your system design. Ensure compatibility with the specified 2.7-V to 5.5-V supply voltage range and check thermal derating requirements if operating near the upper ambient temperature limits.

Selection Notes

Select this component when high-side or low-side bidirectional current sensing is required up to 80 V common-mode voltage. The integrated shunt eliminates external resistor tolerance errors and simplifies PCB layout. Choose the A1 gain version (20 mV/A) if the target full-scale output voltage requires lower amplification compared to the 40 mV/A or 75 mV/A variants available in the series.

Part Context

This device belongs to the INA254 family of high-voltage, integrated precision shunt monitors. Unlike standard current sense amplifiers that require external shunts, the INA254 integrates the sensing element directly with the amplifier. This integration ensures matched thermal tracking between the resistor and the amplifier, significantly improving system-level accuracy and reducing temperature-induced measurement errors.

Replacement Considerations

INA254A2IPWAR

FAQ

How does the INA254 handle large common-mode transients?

The device features enhanced PWM rejection circuitry designed to attenuate large dv/dt common-mode transients associated with PWM signals, minimizing output disturbances without requiring excessive signal bandwidth.

What is the function of the SH+ and SH– pins?

These pins provide access to the positive and negative sense connections of the internal 400-µΩ shunt resistor. They can be connected to IN+ and IN– or an external filter network to optimize measurement accuracy.