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Maxim > Products > [Amplifiers and Comparators]  [Power and Battery Management] 
MAX9938
1µA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier

Industry's Smallest Current-Sense Amplifier: 1mm x 1mm with ICC < 1µA, VOS < 500µV, Gain Error < 0.5%


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 312kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX9938 high-side current-sense amplifier offers precision accuracy specifications of VOS less than 500µV (max) and gain error less than 0.5% (max). Quiescent supply current is an ultra-low 1µA. The MAX9938 fits in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin SOT23 package, making the part ideal for applications in notebook computers, cell phones, PDAs, and all battery-operated portable devices where accuracy, low quiescent current, and small size are critical.

The MAX9938 features an input common-mode voltage range from 1.6V to 28V. These current-sense amplifiers have a voltage output and are offered in four gain versions: 25V/V (MAX9938T), 50V/V (MAX9938F), 100V/V (MAX9938H), and 200V/V (MAX9938W).

The four gain selections offer flexibility in the choice of the external current-sense resistor. The very low 500µV (max) input offset voltage allows small 25mV to 50mV full-scale VSENSE voltage for very low voltage drop at full-current measurement.

The MAX9938 is offered in tiny 4-bump, UCSP (1mm x 1mm x 0.6mm footprint), 5-pin SOT23 packages, and 6-pin µDFN (2mm x 2mm x 0.8mm) packages specified for operation over the -40°C to +85°C extended temperature range.

An evaluation kit is available:  MAX9938EVKIT  

Key Features   Applications/Uses
  • Ultra-Low Supply Current of 1µA (max)
  • Low 500µV (max) Input Offset Voltage
  • Low < 0.5% (max) Gain Error
  • Input Common Mode: +1.6V to +28V
  • Voltage Output
  • Four Gain Versions Available
    • 25V/V (MAX9938T)
    • 50V/V (MAX9938F)
    • 100V/V (MAX9938H)
    • 200V/V (MAX9938W)
  • Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP, 5-Pin SOT23, or 2mm x 2mm x 0.8mm 6-Pin µDFN Packages

 
  		• Cell Phones
  		• Notebook Computers
  		• PDAs
  		• Portable/Battery-Powered Systems
  		• Power Management Systems

    Key Specifications:  Current Sense Amplifiers
    Part Number CMVR
    (V)    		 CMVR
    (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 typ recomm. max max @ -3dB See Notes
    MAX9938  1.6 28 1 No
    25
    50
    100
    		 500
    25 V/V
    50 V/V
    100 V/V
    200 V/V
    		 0.5
    30
    60
    125
    		 0
    µDFN/6
    SOT/5
    UCSP/4
    		 -40 to +85 $0.64 @1k
    See All Current Sense Amplifiers (26)

    Diagram
    MAX9938: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX9938EVKIT

    Design Guides
  		• Amplifiers and Sensors (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: 1-14 of 14

    MAX9938 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9938FELT+T    
    		Active µDFN;6 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0004 (PDF)
    Use pkgcode/variation: L622+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938FELT+  
    		Active µDFN;6 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0004 (PDF)
    Use pkgcode/variation: L622+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938FEUK+  
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938FEUK+T    
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938HEUK+  
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938HEUK+T    
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938TEUK+  
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938TEUK+T    
    		Active SOT;5 pin;9 mm²
    Outline Drawing: 21-0057 (PDF)
    Land Pattern: 90-0174 (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938FEBS+T    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938HEBS+T    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938TEBS+T    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938FEBS+TG45    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938TEBS+TG45    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9938HEBS+TG45    
    		Active UCSP;4 pin;1 mm²
    Outline Drawing: 21-0117 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX9938
  		• New Product Press Release 2008-09-04 
  		• Product Ad: Download

    Related Products
    MAX4372F, MAX4372H, MAX4372T Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output
    MAX4173, MAX4173F, MAX4173H, MAX4173T Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
    MAX4073, MAX4073F, MAX4073H, MAX4073T Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier

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    Document Ref.: 19-4110; Rev 2; 2009-02-25
    This page last modified: 2009-10-26


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