Overview
Features and Benefits
- Low-Cost, Compact Current-Sense Solution
- High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
- Three Gain Versions Available
- +20V/V (MAX4173T)
- +50V/V (MAX4173F)
- +100V/V (MAX4173H)
- ±0.5% Full-Scale Accuracy
- ±3mV Input Offset Voltage (MAX4173T)
- Wide 1.7MHz Bandwidth (MAX4173T)
- 420µA Supply Current
- Available in Space-Saving SOT23 Package
Product Details
The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package. It features a voltage output that eliminates the need for gain-setting resistors and it is ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems, since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery in deep discharge. The MAX4173's wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.
The combination of three gain versions and a user-selectable external sense resistor sets the full-scale current reading. This feature offers a high level of integration, resulting in a simple and compact current-sense solution.
The MAX4173 operates from a single +3V to +28V supply, typically draws only 420µA of supply current over the extended operating temperature range (-40°C to +85°C), and is offered in the space-saving SOT23 package.
How to Measure Current with the MAX4173 Current-Sense Amplifier and a Microcontroller
How to Shrink Your Isolated Power Design with the MAX17681 Iso Buck Technology
Applications
- Cell Phones
- General System/Board-Level Current Monitoring
- Notebook Computers
- PA Bias Control
- Portable Battery-Powered Systems
- Power-Management Systems
- Precision Current Sources
- Smart Battery Packs/Chargers
Product Categories
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
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MAX4173 Reliability Data1/12/2023PDF160K
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.
PCN-PDN Information
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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.