MAX4173T_11 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier 420μA Supply Current

19-1434; Rev 5; 4/11
Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier
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 cur-
rent 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 con-
nected to a battery in deep discharge. The MAX4173’s
wide 1.7MHz bandwidth makes it suitable for use inside
battery charger control loops.
The combination of three gain versions and a user-
selectable external sense resistor sets the full-scale
current reading. This feature offers a high level of inte-
gration, resulting in a simple and compact current-
sense solution.
The MAX4173 operates from a single +3V to +28V sup-
ply, typically draws only 420µA of supply current over
the extended operating temperature range (-40°C to
+85°C), and is offered in the space-saving SOT23
package.
Applications
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General System/Board-Level Current Monitoring
PA Bias Control
Precision Current Sources
Features
o Low-Cost, Compact Current-Sense Solution
o High Accuracy +2V to +28V Common-Mode
Range, Functional Down to 0V, Independent of
Supply Voltage
o Three Gain Versions Available
+20V/V (MAX4173T)
+50V/V (MAX4173F)
+100V/V (MAX4173H)
o ±0.5% Full-Scale Accuracy
o ±3mV Input Offset Voltage (MAX4173T)
o Wide 1.7MHz Bandwidth (MAX4173T)
o 420µA Supply Current
o Available in Space-Saving SOT23 Package
Typical Operating Circuit
0 TO +28V
+3V TO +28V
0.1µF
V_SENSE
R_SENSE
RS+
RS-
V_CC
I_LOAD
MAX4173T/F/H
A/D
CONVERTER
OUT
GND
LOAD/
BATTERY
PART
GAIN (V/V)
MAX4173TEUT+T
20
MAX4173TESA+
20
MAX4173FEUT+T
50
MAX4173FESA+
50
MAX4173HEUT+T
100
MAX4173HESA+
100
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations appear at end of data sheet.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Ordering Information
PIN-PACKAGE
6 SOT23
8 SO
6 SOT23
8 SO
6 SOT23
8 SO
SOT TOP MARK
AABN
—
AABO
—
AABP
—
________________________________________________________________ Maxim Integrated Products 1
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