MAX4173F

·Notebook Computers
·Portable/Battery-Powered Systems
·Smart Battery Packs/Chargers
·Cell Phones
·Power-Management Systems
·General System/Board-Level Current Monitoring
·PA Bias Control
·Precision Current Sources

The MAX4173F low-cost, precision, high-side currentsense 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 MAX4173F's wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.

The combination of three gain versions and a userselectable external sense resistor sets the full-scale current reading. This feature of MAX4173F offers a high level of integration, resulting in a simple and compact currentsense solution.

The MAX4173F operates from a single +3V to +28V supply, typically draws only 420A of supply current over the extended operating temperature range (-40 to +85), and is offered in the space-saving SOT23-6 package.