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Current Sense Amps now come in Small Packages
Maxim's lastest current sense amp is both compact and efficient.
Maxim Integrated Products introduces the MAX4372, a
micropower high-side current-sense amplifier with buffered output in a
space-saving 5-pin SOT23 package (only 3mm x 3mm). Unlike other current-sensing
techniques (which use low-side sensing), this tiny device prevents disruption of
the circuit ground plane by employing a single external resistor between the
power supply and the load. The combination of factory-trimmed gain and this
external sense resistor lets the user select the full-scale range of the
measured current. Three factory-trimmed gains are available: +20V/V (MAX4372T),
+50V/V (MAX4372F), and +100V/V (MAX4372H).
The MAX4372 features a wide
+2.7V to +28V supply voltage range and draws only 30ľA of supply current while
achieving a 275kHz bandwidth (AV = +20V/V). The circuit architecture
allows the input common-mode voltage to range from 0V to +28V, independent of
the supply voltage. Ground-sensing inputs maintain linearity and keep the output
phase from reversing when the input common-mode voltage is near ground. This
feature is useful during power-up or power-down transients and during some input
fault conditions. The MAX4372 achieves a 0.18% full-scale accuracy.
The MAX4372 is offered in
both 5-pin SOT23 and 8-pin SO packages.
The company's Web site address is http://www.maxim.com/.
[Reprinted with kind permission from Maxim]
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