Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output

The MAX4372 low-cost, precision, high-side current-sense amplifier is available in a tiny, space-saving SOT23 5-pin package. Offered in three gain versions (T = 20V/V, F = 50V/V, and H = 100V/V), this device operates from a single 2.7V to 28V supply and consumes only 30µA. It features a voltage output that eliminates the need for gain-setting resistors and is ideal for today's notebook computers, cell phones, and other systems where battery/DC 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 2-cell battery pack in deep discharge.

The user can set the full-scale current reading by choosing the device (T, F, or H) with the desired voltage gain and selecting the appropriate external sense resistor. This capability offers a high level of integration and flexibility, resulting in a simple and compact current-sense solution. For higher bandwidth applications, refer to the MAX4173T/F/H data sheet.

Applications

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

* Low-Cost, Compact Current-Sense Solution

* 30µA Supply Current

* 2.7V to 28V Operating Supply

* 0.18% Full-Scale Accuracy

* 0.3mV Input Offset Voltage

* Low 1.5Ω Output Impedance

* Three Gain Versions Available

* 20V/V (MAX4372T)

* 50V/V (MAX4372F)

* 100V/V (MAX4372H)

* High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage

* Available in a Space-Saving 5-Pin SOT23 Package and 3 x 2 UCSP™ (1mm x 1.5mm) Package