1. Products
  2. Amplifiers
  3. Specialty Amplifiers
  4. Current Sense Amplifiers
  5. MAX9938


Overview

Features and Benefits

  • 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

Product Details

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, and 6-pin µDFN (2mm x 2mm x 0.8mm) packages specified for operation over the -40°C to +85°C extended temperature range.

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

SPICE Model

Product Recommendations

MAX9938 Companion Parts

Recommended Related Parts

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX9938FEBS+G45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938FEBS+TG45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938FELT+ Material Declaration Reliability Data Micro Dual Flatpack No Lead
MAX9938FELT+T Material Declaration Reliability Data Micro Dual Flatpack No Lead
MAX9938FEUK+ Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938FEUK+T Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938HEBS+G45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938HEBS+TG45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938HEUK+ Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938HEUK+T Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938TEBS+G45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938TEBS+TG45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938TEUK+ Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938TEUK+T Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938WEBS+G45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938WEBS+TG45 Material Declaration Reliability Data Wafer-Level Package 2x2 Bump, Full Array
MAX9938WEUK+ Material Declaration Reliability Data Small-Outline Transistor Package
MAX9938WEUK+T Material Declaration Reliability Data Small-Outline Transistor Package
Wafer Fabrication Data

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Sample & Buy


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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.