MAX40056FAUA/V+

Instrumentation, Op Amps, Buffer Amps Overview

The MAX40056FAUA/V+ is a bidirectional current-sense amplifier with a gain of 50 V/V. It operates from +2.7V to +5.5V and supports an input common-mode range from -0.1V to +65V, with protection against negative inductive kickback voltages down to -5V. The device features a typical DC CMRR of 140dB and recovers within 500ns from PWM edges with slew rates up to ±500V/µs. It includes an internal 1.5V reference, a window comparator, and operates over a temperature range of -40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Proprietary input architecture suppresses fast PWM signal disturbances for accurate phase current monitoring.
• Integrated window comparator provides immediate indication of overcurrent fault conditions.
• Internal 1.5V reference offsets the output to indicate the direction of the sensed input current.

Instrumentation, Op Amps, Buffer Amps Applications

• PWM H-Bridge Motor In-line/In-phase/Winding Current Sensing
• Solenoid Current Sensing
• Current Monitoring of Inductive Loads

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix '/V+' corresponds to the required packaging configuration before procurement. Confirm that the component meets AEC-Q100 automotive qualification standards if the application requires it. Ensure the supply voltage remains within the specified operational limits during system design.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this part when high accuracy is required for low-value sense resistors due to its low input offset voltage. The 50 V/V gain is suitable for applications requiring higher output voltage swings relative to small differential input signals. Verify compatibility with the system's PWM edge slew rates to ensure proper recovery times.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the MAX40056 family of bidirectional current-sense amplifiers designed for motor control and solenoid applications. It shares architectural similarities with other members of the series but is distinguished by its fixed 50 V/V voltage gain. The device integrates chopper-stabilized technology to minimize offset drift over temperature.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Other variants within the MAX40056 family offer different gains (10 V/V or 20 V/V) and package options. Substituting with a different gain variant will alter the output voltage scaling and may require adjustments to the downstream ADC or comparator thresholds.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the MAX40056 handle negative inductive kickback?

The device provides protective immunity against negative inductive kickback voltages down to -5V on the RS+ and RS- inputs.

What is the function of the REF pin?

The REF pin outputs an internal 1.5V reference used to offset the amplifier output, indicating current direction. It can also accept an external reference voltage to override the internal one.