MAX4377FAUA+T

The MAX4376/MAX4377/MAX4378 single, dual, and quad precision high-side current-sense amplifiers are available in space-saving packages. They feature buffered voltage outputs that eliminate the need for gain-setting resistors and are ideal for today’s notebook computers, cell phones, and other systems where current monitoring is critical. These precision devices are offered in three fixed-gain versions of 20, 50, and 100. 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 pack in deep discharge. The full-scale current reading can be set by choosing the appropriate voltage gain and external-sense resistor. This capability offers a high level of integration and flexibility, resulting in a simple and compact current-sense solution. The MAX4376/MAX4377/MAX4378 operate over a supply voltage range of +3V to +28V, draw 1mA of supply current per amplifier, and operate over the full automotive temperature range of -40°C to +125°C. These devices have a wide bandwidth of 2MHz, making them suitable for use inside battery-charger control loops. The buffered outputs drive up to 2mA of output current into a ground-referenced load. The MAX4376 is available in a tiny 5-pin SOT23 package. The MAX4377/MAX4378 are available in space-saving 8-pin μMAX and 14-pin TSSOP packages, respectively.

Applications

• Notebook Computers
• Current-Limited Power Supplies
• Fuel Gauges in PC
• General-System/Board-Level Current Monitoring
• Battery Chargers
• Portable/Battery-Powered Systems
• Cell Phones
• Smart Battery Packages
• Automotive Current Detect
• Power Management Systems
• PA Bias Control
• Automotive

Key features

• Low-Cost, Single/Dual/Quad, High-Side CurrentSense Amplifiers
• ±0.5% Typical Full-Scale Accuracy
• +3V to +28V Supply Operation
• Adjustable Current-Sense Capability with External Sense Resistor
• Buffered Output Voltage with 2mA Drive
• 1mA (typ) Supply Current
• 2.0MHz Bandwidth (Gain = +20V/V)
• Automotive Temperature Range (-40°C to +125°C)
• High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
• Three Gain Versions Available +20V/V (MAX437_T), +50V/V (MAX437_F), +100V/V (MAX437_H)
• Available in Space-Saving 5-Pin SOT23 (Single), 8-Pin μMAX (Dual), and 14-Pin TSSOP (Quad)
• AEC-Q100 Qualified