The MAX4173FESA 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 MAX4173FESA 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.
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Feature
- 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
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
