Datasheet

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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
Features
♦ Low-Cost, Compact Current-Sense Solution
♦ 30µA Supply Current
♦ +2.7V to +28V Operating Supply
♦ 0.18% Full-Scale Accuracy
♦ Low 1.5Ω Output Impedance
♦ Three Gain Versions Available
+20V/V (MAX4372T)
+50V/V (MAX4372F)
+100V/V (MAX4372H)
♦ Wide 0 to +28V Common-Mode Range,
Independent of Supply Voltage
♦ Available in Space-Saving SOT23-5 Package
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
________________________________________________________________ Maxim Integrated Products 1
RS+
15RS-
MAX4372T/F/H
SOT23-5
TOP VIEW
2
34
RS-
N.C.OUT
1
2
8
7
RS+
N.C.N.C.
GND
V
CC
SO
3
4
6
5
MAX4372T/F/H
OUT
V
CC
GND
19-1548; Rev 0; 10/99
PART
MAX4372TEUK-T
MAX4372TESA
MAX4372FEUK-T -40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
5 SOT23-5
8 SO
5 SOT23-5
Pin Configurations
Ordering Information
TOP
MARK
ADIU
—
ADIV
MAX4372FESA
MAX4372HEUK-T
MAX4372HESA -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 8 SO
5 SOT23-5
8 SO
—
ADIW
—
RS-
OUT
A/D
CONVERTER
V
CC
V
CC
GND
RS+
R
SENSE
V
SENSE
I
LOAD
V
IN
0 TO 28V
+2.7V TO +28V
0.1µF
MAX4372T/F/H
LOAD/
BATTERY
Typical Operating Circuit
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.