ADIMAX4081FASA+
Overview
The MAX4081FASA+ is a high-side, bidirectional current-sense amplifier designed for systems where the common-mode voltage ranges from 4.5V to 76V. It features a high gain of 5V/V and uses an external reference voltage to define the zero-current output level, allowing for precise monitoring of both charge and discharge currents. Its low 103uA supply current and 100uV input offset voltage make it suitable for power-sensitive, high-precision applications.
Why Choose This Part
The wide 4.5V to 76V input range eliminates the need for separate supply and sensing rails in high-voltage systems. Its bidirectional sensing capability via a single output pin simplifies ADC interfacing by using a reference voltage to shift the zero-point. The device also offers high accuracy with a 100uV offset and remains stable across a wide -40C to 125C temperature range.
Applications
Key Specifications
Getting Started
To implement the MAX4081FASA+, place a low-value shunt resistor in the high-side path and connect the RS+ and RS- pins directly across it. Apply a reference voltage to the REF pin to set the output offset for bidirectional sensing; for unidirectional use, connect REF to ground. Ensure a decoupling capacitor is placed close to the VCC pin to maintain stability in noisy industrial or automotive environments.
