MAX49921FATA/VY+

EVALUATION KIT AVAILABLE Click here to ask an associate for production status of specific part numbers. MAX49921 0 to 70V, High-Precision Current-Sense Amplifier General Description Benefits and Features The MAX49921 is high-precision, unidirectional current- AEC-Q100 Qualified for Automotive Applications sense amplifier (CSA) with an operating input common- 0.5V (typ) Input Offset Voltage mode range from 0 to +70V, though the device is pro- 0.05% (typ) Gain Error tected against input common-mode voltages down to -42V 0 to +70V Input Voltage Range and up to +80V, thus providing protection against reverse- -42V to +80V Protective Immunity battery and high-voltage spikes. The MAX49921 is well- 65kHz, -3dB Bandwidth suited for current monitoring of inductive loads, such as 140dB DC CMRR DC motors and solenoids, where common-mode voltages Gain Options: 20V/V, 50V/V can become negative due to inductive kickback, reverse- Rail-to-Rail Output battery conditions, or transient events. 2mm x 3mm, 8-Pin TDFN Package -40C to +125C Automotive Temperature Range The low input offset of 0.5V (typ) and low gain error of 0.05% (typ) make this device best-suited for high-preci- Ordering Information appears at end of data sheet. sion current measurements. The MAX49921 operates from a supply voltage of +2.7V Simplified Block Diagram to +5.5V with a typical quiescent supply at 0.7mA. This V DD device is specified over the full -40C to +125C automo- tive temperature range and is AEC-Q100 qualified. The MAX49921 is offered in a 2mm x 3mm, 8-pin, side-wet- table TDFN package with gain options of 20V/V and RS+ 50V/V. LEVEL OUT RS- SHIFTING Applications Solenoid Current Sensing MAX49921MAX49921 Battery Current Monitoring Current Monitoring of Inductive Loads GND High- and Low-Side Precision Current Sensing Supercapacitor Charge/Discharge Monitoring Precision High-Voltage Current Monitoring Automotive Current Sensing Ordering Information appears at end of data sheet. 19-100848 Rev 1 9/21 2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 2021 Analog Devices, Inc. All rights reserved.MAX49921 0 to 70V, High-Precision Current-Sense Amplifier TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simplified Block Diagram . 1 Absolute Maximum Ratings 3 Package Information . 3 8 TDFN . 3 Electrical Characteristics (V = 5V) . 4 DD Typical Operating Characteristics 6 Pin Configuration 9 MAX49921 9 Pin Description . 9 Detailed Description 10 Applications Information . 11 Recommended Component Values 11 Choosing the Sense Resistor . 11 Voltage Loss . 11 Accuracy 11 Efficiency and Power Dissipation . 11 Stray Inductance 11 Important Considerations 11 Power-Supply Bypassing 11 Typical Application Circuits . 12 Solenoid Current Measurement 12 DC Motor Current Measurement 12 Ordering Information 13 Revision History . 14 www.analog.com Analog Devices 2