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    Parts    MAX9918ASA+
MAX9918ASA+

ADIMAX9918ASA+

Analog Devices Inc./Maxim Integrated
Current Sense Amplifier 1 Circuit Rail-to-Rail 8-SOIC-EP
Active469 in stock
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Overview

The MAX9918ASA+ is a high-side current-sense amplifier designed for applications requiring wide input common-mode range and precision. It operates with a supply voltage between 4.5V and 5.5V and features a rail-to-rail output for maximum dynamic range. This device is particularly suited for monitoring current in environments with large common-mode transients.

Why Choose This Part

The part offers a low input offset voltage of 400 uV and a 75 kHz bandwidth, balancing precision with sufficient speed for many control loops. Its rail-to-rail output allows for easy interfacing with 5V ADCs, and the 175 uA input bias current ensures minimal error in high-impedance sensing circuits.

Applications

Automotive Current Monitoring
Ideal for battery management and power steering systems where high-side current sensing is required across varying common-mode voltages.
Precision Power Supplies
Used in feedback loops for closed-loop current control in industrial and consumer power delivery modules.
Solenoid and Motor Control
Monitors current through inductive loads to detect fault conditions or implement precise torque control.

Key Specifications

Slew Rate 0.6V/us
Output Type Rail-to-Rail
Mounting Type Surface Mount
-3db Bandwidth 75 kHz
Amplifier Type Current Sense
Package / Case 8-SOIC (0.154", 3.90mm Width) Exposed Pad
Current - Supply 1mA
Number of Circuits 1
Current - Input Bias 175 uA
Operating Temperature -40degC ~ 125degC
Voltage - Input Offset 400 uV
Supplier Device Package 8-SOIC-EP
Voltage - Supply Span (Max) 5.5 V
Voltage - Supply Span (Min) 4.5 V

Getting Started

When prototyping, ensure the 8-SOIC-EP package thermal pad is properly soldered to a ground plane for optimal thermal performance. Use low-ESR bypass capacitors on the 5V supply line and place the shunt resistor as close to the input pins as possible to minimize trace inductance. Evaluation kits like the MAX9918EVKIT can be used to validate performance before PCB layout.

Also Consider

INA240-Q1 TITexas Instruments - Offers enhanced PWM rejection for motor control applications and is AEC-Q100 qualified.
MAX4080 Analog Devices / Maxim Integrated - Suitable for applications requiring much higher common-mode input voltages up to 76V.