AVAILAB
LE
MAX4372T/F/H
Low-Cost, UCSP/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-pin 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 sup-
ply 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
30µA Supply Current
o
2.7V to 28V Operating Supply
o
0.18% Full-Scale Accuracy
o
0.3mV Input Offset Voltage
o
Low 1.5Ω Output Impedance
o
Three Gain Versions Available
20V/V (MAX4372T)
50V/V (MAX4372F)
100V/V (MAX4372H)
o
High Accuracy
+2V
to +28V Common-Mode
Range, Functional Down to 0V, Independent of
Supply Voltage
o
Available in a Space-Saving 5-Pin SOT23 Package
and 3 x 2 UCSP™ (1mm x 1.5mm) Package
Features
o
Low-Cost, Compact Current-Sense Solution
Ordering Information
PART
MAX4372TEUK-T
MAX4372TEUK+T
MAX4372TESA+T
MAX4372TEBT-T
MAX4372TEBT+T
TEMP RANGE PIN-PACKAGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
5 SOT23-5
8 SO
3 x 2 UCSP
TOP
MARK
ADIU
—
ACX
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
Functional Diagrams
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
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.
Ordering Information continued at end of datasheet.
Typical Operating Circuit
I
LOAD
GND
RS-
Pin Configurations
TOP VIEW
+
GND
1
5
RS-
A
V
CC
GND
OUT
TOP VIEW
(BUMPS ON BOTTOM)
1
2
3
OUT
2
MAX4372T/F/H
A/D
CONVERTER
MAX4372T/F/H
OUT
R
SENSE
V
SENSE
LOAD/
BATTERY
MAX4372T/F/H
B
RS+
RS-
4
RS+
V
CC
3
V
CC
+2.7V TO +28V
0.1µF
V
CC
RS+
V
IN
0 TO 28V
Pin Configurations appear at end of data sheet.
SOT23-5
Functional Diagrams continued at end of data sheet.
Pin Configurations continued at end of datasheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
UCSP
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1548; Rev 5; 5/11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
