MAX9920ASA+T

Instrumentation, Op Amps, Buffer Amps Overview

The MAX9920ASA+T is a single-supply, high-accuracy current-sense amplifier with an input common-mode range extending from -20V to +75V. It features adjustable gain set by an external resistive-divider network and attenuates the input signal by a factor of 4 at the level-shifting stage, enabling sensing of voltages up to 200mV in unidirectional mode or ±100mV in bidirectional mode. The device operates on a single 5V supply (4.5V to 5.5V) and is fully specified over the -40°C to +125°C automotive temperature range.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Supports both unidirectional and bidirectional current sensing configurations via the REFIN pin.
• Provides a wide common-mode voltage range accommodating negative transients and reverse-battery conditions.
• Features externally adjustable gain through an external resistive-divider network connected to the FB pin.

Instrumentation, Op Amps, Buffer Amps Applications

• H-Bridge Motor Current Sensing
• Solenoid Current Sensing
• Current Monitoring of Inductive Loads
• High- and Low-Side Precision Current Sensing
• Super-Capacitor Charge/Discharge Monitoring

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix for automotive qualification requirements. The MAX9920ASA/V+ variant holds AEC-Q100 qualification, whereas the standard MAX9920ASA+T does not. Confirm package availability and lead times directly with authorized distributors as stock levels fluctuate. Ensure the ordering code matches the required thermal and electrical specifications for the target application environment.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select the MAX9920ASA+T when applications require a higher full-scale sense voltage compared to the MAX9918/MAX9919 series. The internal attenuation allows for larger differential input signals without saturating the output. Consider the adjustable gain feature for flexibility in system design. Verify that the 5V single-supply operation aligns with the system power architecture and that the SO-EP package fits the board layout constraints.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the MAX9918/MAX9919/MAX9920 family of precision current-sense amplifiers designed for demanding industrial and automotive environments. While sharing the same wide common-mode range and package, the MAX9920 distinguishes itself with a 200mV full-scale sense capability due to its internal input attenuation. This makes it suitable for lower-current or higher-resistance sensing scenarios where maximizing signal headroom is critical.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

MAX9920ASA/V+