MAX49921
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MAX49921

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

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Unidirectional Automotive CSA with Most Extended Protection Immunity

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1ku List Price Starting From $1.10
Features
  • 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
Additional Details
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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
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file View Data Sheet (Rev.1)
Documentation View All Documentation
Part Models 4
1ku List Price Starting From $1.10
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MAX49921

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UPDATED 10/06/2021
English

MAX49921: 0 to 70V, High-Precision Current-Sense Amplifier Data Sheet (Rev.1)

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Documentation

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2022-10-04

05:59

Introduction to the MAX49921 Bi- and Unidirectional, 0V to 70V Current-Sense Amplifiers

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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
MAX49921FATA/VY+ 8-LFCSP_SS-2X2X0.75 external-link
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MAX49921FATA/VY+T 8-LFCSP_SS-2X2X0.75 external-link
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MAX49921TATA/VY+ 8-LFCSP_SS-2X2X0.75 external-link
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MAX49921TATA/VY+T 8-LFCSP_SS-2X2X0.75 external-link
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Evaluation Kits 1

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MAX49921EVKIT

Evaluation Kit for the MAX49921

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MAX49921EVKIT

Evaluation Kit for the MAX49921

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MAX49921EVKIT
Evaluation Kit for the MAX49921

Features and Benefits

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

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

Resources

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MAX49921EVKIT ODB Files - Design Files Download

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Evaluation Kits1

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MAX49921EVKIT

Evaluation Kit for the MAX49921

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