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MAX4377：Single/Dual/Quad High-Side Current-Sense Amplifiers with Internal Gain

Industry's-First SOT23 High-Side Current-Sense Amplifier with Buffered Output

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: GAIN SUFFIX 20 T 50 F 100 H For example, MAX4376TAUK is a single high-side amplifier with a gain of 20. 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.

Key Features Low-Cost Single/Dual/Quad High-Side Current-Sense 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)

MAX4376, MAX4377, MAX4378: Pin Configuration Applications/Uses Automotive Current Detect Battery Chargers Cell Phones Current-Limited Power Supplies Fuel Gauges in PC General-System/Board-Level Current Monitoring Notebook Computers PA Bias Control Portable/Battery-Powered Systems Power-Management Systems Smart Battery Packages

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Related Products

• MAX4173T：Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
• MAX4173H：Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
• MAX4173F：Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier

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