General Description

The MAX4173 low-cost, precision, high-side current sense amplifier is available in a tiny SOT23-6 package. It features a voltage output that eliminates the need for gain-setting resistors and it is ideal for today’s notebook computers, cell phones, and other systems where 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 battery in deep discharge. The MAX4173’s wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.

Features

♦Low-Cost, Compact Current-Sense Solution

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

Supply Voltage

♦Three Gain Versions Available

  +20V/V (MAX4173T)

  +50V/V (MAX4173F)

  +100V/V (MAX4173H)

♦±0.5% Full-Scale Accuracy

♦±3mV Input Offset Voltage (MAX4173T)

♦Wide 1.7MHz Bandwidth (MAX4173T)

♦420µA Supply Current

♦Available in Space-Saving SOT23 Package