MAX49921

PRODUCTION

0 to 70V, High-Precision Current-Sense Amplifier

Unidirectional Automotive CSA with Most Extended Protection Immunity

Data Sheet (Rev. 1)
Product Selection Table
Viewing:

Overview

  • AEC-Q100 Qualified for Automotive Applications
  • ± 0.5µV (typ) Input Offset Voltage
  • ± 0.05% (typ) Gain Error
  • 0 to +70V Input Voltage Range
  • -42V to +80V Protective Immunity
  • 65kHz, -3dB Bandwidth
  • 140dB DC CMRR
  • Gain Options: 20V/V, 50V/V
  • Rail-to-Rail Output
  • 2mm x 3mm, 8-Pin TDFN Package
  • -40°C to +125°C Automotive Temperature Range

The MAX49921 is high-precision, unidirectional current-sense amplifier (CSA) with an operating input common-mode range from 0 to +70V, though the device is protected against input common-mode voltages down to -42V and up to +80V, thus providing protection against reverse-battery and high-voltage spikes. The MAX49921 is well-suited for current monitoring of inductive loads, such as DC motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events.

The low input offset of ±0.5µV (typ) and low gain error of ± 0.05% (typ) make this device best suited for high-precision current measurements.

The MAX49921 operates from a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. This device is specified over the full -40°C to +125°C automotive temperature range and is AEC-Q100 qualified. The MAX49921 is offered in a 2mm x 3mm, 8-pin, side-wettable TDFN package with gain options of 20V/V and 50V/V.

Applications

  • Automotive Current Sensing
  • Battery Current Monitoring
  • Current Monitoring of Inductive Loads
  • High- and Low-Side Precision Current Sensing
  • Precision High-Voltage Current Monitoring
  • Solenoid Current Sensing
  • Supercapacitor Charge/Discharge Monitoring
MAX49921
0 to 70V, High-Precision Current-Sense Amplifier
MAX49921: Simplified Block Diagram
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts Product Life Cycle Description
Current Sense Amplifiers 5
MAX9919
PRODUCTION -20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
MAX9920
PRODUCTION -20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
MAX40201
RECOMMENDED FOR NEW DESIGNS Dual-Channel, 0V to 76V Current-Sense Amplifier
MAX40056F
RECOMMENDED FOR NEW DESIGNS Bidirectional Current Sense Amplifier with PWM-Rejection
MAX40056U
PRODUCTION Bidirectional Current Sense Amplifier with PWM-Rejection
Modal heading
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Evaluation Kits

eval board
schematic 1
MAX49921EVKIT

Evaluation Kit for the MAX49921

Buy Now View Details

Features and Benefits

  • Precision Real-Time Current Monitoring
  • 0V to +70V Input Common-Mode Range
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX49921 evaluation kit (EV kit) provides a proven design to evaluate the MAX49921 high precision, high voltage, unidirectional current-sense amplifier. This EV kit demonstrates the MAX49921 in a small, 2mm x 3mm 8-pin TDFN package.

The EV kit PCB comes with a MAX49921FATA/VY+ installed, which is the 50V/V gain version. The other gain option available is the pin-compatible MAX49921TATA/ VY+ (G = 20V/V). Contact the factory for MAX49921TATA/ VY+ availability.

Applications

  • Automotive Current Sensing
  • Battery Current Monitoring
  • Current Monitoring of Inductive Loads
  • High- and Low-Side Precision Current Sensing
  • Precision High-Voltage Current Monitoring
  • Solenoid Current Sensing
  • Super-Capacitor Charge/Discharge Monitoring
MAX49921EVKIT
Evaluation Kit for the MAX49921
MAX49921EVKIT: Photo Boardt

Latest Discussions

No discussions on MAX49921 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed