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Maxim > Products > [Amplifiers and Comparators]  [Power and Battery Management] 
MAX9922, MAX9923
Ultra-Precision, High-Side Current-Sense Amplifiers

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


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Status
Part Number Status
MAX9922 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.
MAX9923 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 408kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
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 patented 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.

An evaluation kit is available:  MAX9922EVKIT  

Key Features   Applications/Uses
  • 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

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

    Key Specifications:  Current Sense Amplifiers
    Part Number CMVR
    (V)    		 CMVR
    (V)    		 VCC
    (V)    		 VCC
    (V)    		 ICC
    (µA)    		 Bi-Dir. Curr. Sense VSENSE_FS
    (mV)    		 VOS @25°C
    (µV)    		 Gain Gain Accuracy @25°C
    (%)    		 BW
    (kHz)    		 Comp-
    arators    		 Package/Pins Oper. Temp.
    (°C)    		 Price
    min max min max typ recomm. max max @ -3dB See Notes
    MAX9922  1.9 28 2.85 5.5 700 Yes +/-150 10 Adj. 0.4 1000 0
    µMAX/10
    		 -40 to +85 $1.29 @1k
    MAX9923 
    25 V/V
    100 V/V
    250 V/V
    		 0.3
    µMAX/10
    		 $1.29 @1k
    See All Current Sense Amplifiers (26)

    Diagram
    MAX9922, MAX9923: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX9922EVKIT

    Design Guides
  		• Amplifiers and Sensors (PDF)
  		• Battery Management (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-13 of 13

    MAX9922 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9922AUB+     N/A No Longer Available µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9922AUB+T     N/A No Longer Available

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX9922EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9922EUB+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX9923 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9923FAUB+     N/A No Longer Available

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX9923HAUB+     N/A No Longer Available

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX9923TAUB+     N/A No Longer Available

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX9923FEUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9923FEUB+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX9923HEUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9923HEUB+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX9923TEUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9923TEUB+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

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     Description 
     Key Features 
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    Document Ref.: 19-4429; Rev 0; 2009-03-23
    This page last modified: 2009-03-23


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