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

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.

Applications

* Automotive * 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

* 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 (MAX437T)

* +50V/V (MAX437F)

* +100V/V (MAX437H)

* Available in Space-Saving 5-pin SOT23 (Single), 8-pin µMAX (Dual), and 14-pin TSSOP (Quad)

* AEC-Q100 Qualified, Refer to Ordering Information for the List of /V Parts