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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%

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.

Key Features 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

MAX9938: Typical Operating Circuit Applications/Uses Cell Phones Notebook Computers PDAs Portable/Battery-Powered Systems Power Management Systems

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9938EVKIT

Related Products

• MAX4073：Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier
• MAX4372：Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output

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