MAX9938
nanoPower, 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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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
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Product Lifecycle
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)
Documentation & Resources
Tools & Simulations
SPICE Model
LIB
MAX9938 SPICE Macro Model
3.48K
Product Recommendations
MAX9938 Companion Parts
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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.