MAX4372T Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Low-Cost, SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output

19-1548; Rev 0; 10/99
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
General Description
The MAX4372 low-cost, precision, high-side current-
sense amplifier is available in a tiny, space-saving
SOT23-5 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 con-
sumes only 30µA. It features a voltage output that elimi-
nates 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 bat-
tery-powered systems since it does not interfere with
the ground path of the battery charger. The input com-
mon-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 volt-
age gain and selecting the appropriate external sense
resistor. This capability offers a high level of integration
and flexibility, resulting in a simple and compact cur-
rent-sense solution. For higher bandwidth applications,
refer to the MAX4173T/F/H data sheet.
Applications
Power-Management Systems
General-System/Board-Level Current Monitoring
Notebook Computers
Portable/Battery-Powered Systems
Smart-Battery Packs/Chargers
Cell Phones
Precision-Current Sources
Pin Configurations
TOP VIEW
Features
o Low-Cost, Compact Current-Sense Solution
o 30µA Supply Current
o +2.7V to +28V Operating Supply
o 0.18% Full-Scale Accuracy
o Low 1.5Ω Output Impedance
o Three Gain Versions Available
+20V/V (MAX4372T)
+50V/V (MAX4372F)
+100V/V (MAX4372H)
o Wide 0 to +28V Common-Mode Range,
Independent of Supply Voltage
o Available in Space-Saving SOT23-5 Package
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
TOP
MARK
MAX4372TEUK-T -40°C to +85°C 5 SOT23-5
ADIU
MAX4372TESA -40°C to +85°C 8 SO
—
MAX4372FEUK-T -40°C to +85°C 5 SOT23-5
ADIV
MAX4372FESA -40°C to +85°C 8 SO
—
MAX4372HEUK-T -40°C to +85°C 5 SOT23-5
ADIW
MAX4372HESA -40°C to +85°C 8 SO
—
Note: Gain values are as follows: +20V/V for the T version,
+50V/V for the F version, and +100V/V for the H version.
Typical Operating Circuit
GND
RS-
I_LOAD
GND 1
5 RS-
OUT
MAX4372T/F/H
2
V_{CC 3}
4 RS+
V_CC 1
8 RS+
N.C. 2
7 N.C.
MAX4372T/F/H
GND 3
6 RS-
OUT 4
5 N.C.
SOT23-5
SO
A/D
CONVERTER
V_CC
+2.7V TO +28V
0.1µF
MAX4372T/F/H
OUT
R_SENSE
V_SENSE
LOAD/
BATTERY
V_CC
RS+
V_IN
0 TO 28V
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