MAX49918

RECOMMENDED FOR NEW DESIGNS

Bidirectional, On-The-Fly Programmable Gain, Current-Sense Amplifier with Wide Measurement Range

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.50

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Overview

Programmable Gain Options through I²C from 10V/V to 200V/V (8 steps)
±1μV (typ) Input Offset Voltage for REF1 = REF2 = VDD/2
±5μV (typ) Input Offset Voltage for REF1 = V_DD and REF2 = GND at Gain = 20V/V
±0.01% (typ) Gain Error

-5V to +70V Input Voltage Range
-6V to +80V Protective Immunity
70kHz, -3dB Bandwidth at Gain = 20V/V
145dB DC CMRR
Rail-to-Rail Output
3mm x 3mm, TDFN-10 Package
-40°C to +125°C Temperature Range

The MAX49918 is a high-precision current-sense amplifier (CSA) with an I²C programmable gain option from 10V/V to 200V/V in 8 steps. The multiple programmable gain options offer maximum flexibility for the user to change gain on-the-fly.

The IC operating input common-mode range from -5V to +70V, with protections that extend down to -6V and up to +80V, thus providing protection against reverse-battery and high-voltage spikes.

The low input offset of ±1μV (typ) and low gain error of ±0.01% (typ) make this device best-suited for high-precision current measurements.

The IC operates from a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. The device operates over the full -40°C to +125°C temperature range. The IC features bidirectional current sensing and is offered in a 3mm x 3mm, 10-pin TDFN package.

APPLICATIONS

Monitoring Distinct Current Levels
Using the Same Current-Sense Resistors Across Multiple System Variants
Requires a Non-Typical Gain Value Due to Sense Resistor Constraints
H-Bridge Motor and Solenoid Current Sensing
Battery Current Monitoring
High- and Low-Side Precision Current Sensing

Part Models: 2
1ku List Price: Starting From $1.50

Documentation

Data Sheet 1

MAX49918: Bidirectional, On-The-Fly Programmable Gain, Current-Sense Amplifier with Wide Measurement Range Data Sheet (Rev.0) 10/20/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX49918IATB+	10-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX49918IATB+T	10-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX49918IATB+	PRODUCTION	pcn_2400

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

MAX49918

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

Evaluation Kit for the MAX49918

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Features and Benefits

Programmable Gain Options through I2C from 10V/V to 200V/V (8 steps)
±1μV (typ) Input Offset Voltage for REF1 = REF2 = VDD/2
±5μV (typ) Input Offset Voltage for REF1 = VDD and REF2 = GND for Gain = 20V/V
±0.01% (typ) Gain Error
-5V to +70V Input Voltage Range
-6V to +80V Protective Immunity
70kHz, -3dB Bandwidth for Gain = 20V/V
145dB DC CMRR
Rail-to-Rail Output
3mm x 3mm TDFN-10 Package
-40°C to +125°C Temperature Range

Product Details

The MAX49918 evaluation kit (EV kit) is a fully tested and assembled circuit that demonstrates the capabilities of the MAX49918, a high-precision, wide measurement range, programmable gain, bidirectional current-sense amplifier that monitors two distinct current levels.

The gain of MAX49918 is programmed by I2C communication.

The MAX49918 EV kit operates over the automotive temperature range of -40°C to +125°C.

The EV kit reserves a PCB footprint so that a MAX32625PICO board can be soldered on it. With the MAX32625PICO board, users can control the gain conveniently with the GUI software.

Resources

MAX49918EVKIT: Evaluation Kit for the MAX49918 (Rev.0)
10/20/2023

MAX49918EVKIT Gerber Files
10/20/2023

Software

MAX49918 Evaluation Software
23.95 M

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