MAX9922
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MAX9922

Ultra-Precision, High-Side Current-Sense Amplifiers

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Use Autozeroing Front-End to Achieve VOS < 10µV, Allowing Small VSENSE and RSENSE

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.03
Features
  • Ultra-Precision VOS Over Temperature
    • MAX9922: ±10µV (max)
    • MAX9923T: ±25µV (max)
    • MAX9923H: ±20µV (max)
    • MAX9923F: ±10µV (max)
  • ±0.5% (max) Full-Scale Gain Accuracy
  • Bidirectional or Unidirectional ISENSE
  • Multiple Gains Available
    • Adjustable (MAX9922)
    • +25V/V (MAX9923T)
    • +100V/V (MAX9923H)
    • +250V/V (MAX9923F)
  • 1.9V to 28V Input Common-Mode Voltage, Independent of VDD
  • Supply Voltage: +2.85V to +5.5V
  • 700µA Supply Current, 1µA Shutdown Current
  • Extended Temperature Range (-40°C to +85°C)
  • Available in Space-Saving 10-Pin µMAX
Additional Details
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The MAX9922/MAX9923 ultra-precision, high-side current-sense amplifiers feature ultra-low offset voltage (VOS) of 25µV (max) and laser-trimmed gain accuracy better than 0.5%. The combination of low VOS and high-gain accuracy allows precise current measurements even at very small sense voltages.

The MAX9922/MAX9923 are capable of both unidirectional and bidirectional operation. For unidirectional operation, connect REF to GND. For bidirectional operation, connect REF to VDD/2.

The MAX9922 has adjustable gain set with two external resistors. The MAX9923T/MAX9923H/MAX9923F use an internal laser-trimmed resistor for fixed gain of 25V/V, 100V/V, and 250V/V, respectively. The devices operate from a +2.85V to +5.5V single supply, independent of the input common-mode voltage, and draw only 700µA operating supply current and less than 1µA in shutdown.

The +1.9V to +28V current-sense input common-mode voltage range makes the MAX9922/MAX9923 ideal for current monitoring in applications where high accuracy, large common-mode measurement range, and minimum full-scale VSENSE voltage is critical.

The MAX9922/MAX9923 use a spread-spectrum autozeroing technique that constantly measures and cancels the input offset voltage, eliminating drift over time and temperature, and the effect of 1/f noise. This, in conjunction with the indirect current-feedback technique, achieves less than 25µV (max) offset voltage.

The MAX9922/MAX9923 are available in a small 10-pin µMAX® package and are specified over the -40°C to +85°C extended temperature range.

Applications

  • Handheld Li+ Battery Current Monitoring
  • Notebook/Desktop Power Management
  • Precision Current Sources
Part Models 2
1ku List Price Starting From $2.03

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX9922EUB+
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MAX9922EUB+T
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX9922EVKIT

Evaluation Kit for the MAX9922 and MAX9923

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MAX9922EVKIT

Evaluation Kit for the MAX9922 and MAX9923

Evaluation Kit for the MAX9922 and MAX9923

Features and Benefits

  • Bidirectional or Unidirectional Current Sensing
  • Shutdown Logic Input Control
  • Multiple Gains Available
    • Adjustable (MAX9922)
    • 25V/V (MAX9923T)
    • 100V/V (MAX9923H)
    • 250V/V (MAX9923F)
  • 2.85V to 5.5V Supply Range (VDD)
  • 1.9V to 28V Input Common-Mode Range Independent of VDD
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Detail

The MAX9922 evaluation kit (EV kit) is a fully assembled and tested PCB used to evaluate the MAX9922 and MAX9923 ultra-precision, high-side current-sense amplifiers. An ultra-low offset voltage (VOS) of 10µV (max) allows accurate measurement of currents at both extremes of sense voltages (VSENSE), from 10mV to 100mV. The EV kit has a 1.9V to 28V input common-mode sense voltage range that is independent of the 2.85V to 5.5V VDD supply.

The MAX9922 EV kit comes assembled with the MAX9922 IC with adjustable gain, but can also evaluate the MAX9923 ICs with fixed gains of 25V/V (MAX9923T), 100V/V (MAX9923H), and 250V/V (MAX9923F). The MAX9922/MAX9923 are capable of both unidirectional and bidirectional operation.

Applications

  • Handheld Li+ Battery Current Monitoring
  • Notebook/Desktop Power Management
  • Precision Current Sources

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