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 30碌A(chǔ). It features a voltage output that elimi-
nates the need for gain-setting resistors and is ideal for
today鈥檚 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.
o
30碌A(chǔ) Supply Current
o
+2.7V to +28V Operating Supply
o
0.18% Full-Scale Accuracy
o
Low 1.5鈩?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
Features
o
Low-Cost, Compact Current-Sense Solution
MAX4372T/F/H
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
TOP
MARK
ADIU
鈥?/div>
ADIV
鈥?/div>
MAX4372TEUK-T -40擄C to +85擄C 5 SOT23-5
MAX4372TESA
-40擄C to +85擄C 8 SO
MAX4372FEUK-T -40擄C to +85擄C 5 SOT23-5
MAX4372FESA
-40擄C to +85擄C 8 SO
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
MAX4372HEUK-T -40擄C to +85擄C 5 SOT23-5
ADIW
MAX4372HESA
-40擄C to +85擄C 8 SO
鈥?/div>
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
I
LOAD
GND
RS-
Pin Configurations
TOP VIEW
GND
1
5
RS-
V
CC
1
N.C.
2
GND
3
8
RS+
N.C.
RS-
N.C.
MAX4372T/F/H
A/D
CONVERTER
OUT
R
SENSE
V
SENSE
OUT
2
MAX4372T/F/H
MAX4372T/F/H
7
6
5
LOAD/
BATTERY
V
CC
3
4
RS+
OUT
4
V
CC
+2.7V TO +28V
0.1碌F
V
CC
RS+
V
IN
0 TO 28V
SOT23-5
SO
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Maxim
1
2
3
4
5
6
7
8
