MAX4372 High-Precision, High-Side Current-Sense Amplifier

The MAX4372 low-cost, high-precision, high-side current-sense amplifier is available in a tiny, space-saving SOT23-5-pin package. Available in three gain versions (T = 20V/V, F = 50V/V, and H = 100V/V), the 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 requiring battery/DC current monitoring. High-side current monitoring in battery-powered systems is particularly useful because it does not interfere with the ground path of the battery charger. The input common-mode range is 0 to 28V independent of the supply voltage and ensures that current-sense feedback remains viable even when connected to a 2-cell Li-Ion battery in deep discharge. The user can set the desired voltage gain for full-scale current reading by selecting the device (T, F, or H) and selecting the appropriate external sense resistor. This functionality provides a high level of integration and flexibility in a simple and compact current-sensing solution. For higher-bandwidth applications, refer to the MAX4173T/F/H data sheet.

　　Key Features

　　Low-cost, compact current sensing solution

　　30μA supply current

　　2.7V to 28V operating power supply

　　0.18% full scale accuracy

　　0.3mV input offset voltage

　　1.5Ω low output impedance

　　Three gain versions

　　20V/V (MAX4372T)

　　50V/V (MAX4372F)

　　100V/V (MAX4372H)

　　High-precision +2 V to +28 V common-mode range, functional down to 0 V, independent of supply voltage

　　Available in space-saving 5-pin SOT23 and 3 × 2 UCSP™ (1 mm x 1.5 mm) packages