MAX4372T/F/H
Low-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Features
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 oper-
ates from a single 2.7V to 28V supply and consumes only
30μA. It features a voltage output that eliminates 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 common-
mode range of 0 to 28V is independent of the supply volt-
age 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 choos-
ing the device (T, F, or H) with the desired voltage gain
and selecting the appropriate external sense resistor.
This capability offers a high level of integration and flex-
ibility, resulting in a simple and compact current-sense
solution. For higher bandwidth applications, refer to the
MAX4173T/F/H data sheet.
●
Low-Cost, Compact Current-Sense Solution
● 30μA Supply Current
●
2.7V to 28V Operating Supply
●
0.18% Full-Scale Accuracy
● 0.3mV Input Offset Voltage
● Low 1.5Ω Output Impedance
●
Three Gain Versions Available
• 20V/V (MAX4372T)
• 50V/V (MAX4372F)
• 100V/V (MAX4372H)
●
High Accuracy +2V to +28V Common-Mode Range,
Functional Down to 0V, Independent of Supply
Voltage
●
Available in a Space-Saving 5-Pin SOT23 Package
and 3 x 2 UCSP™ (1mm x 1.5mm) Package
Ordering Information
PART
MAX4372TEUK+T
MAX4372TEBT+T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23
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
+Denotes 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 appears at end of data sheet.
Typical Operating Circuit
I
LOAD
GND
RS-
Pin Configurations
TOP VIEW
TOP VIEW
(BUMPS ON BOTTOM)
1
GND
1
5
RS-
A
V
CC
GND
OUT
V
CC
+2.7V TO +28V
0.1µF
2
3
A/D
CONVERTER
MAX4372T
MAX4372F
OUT
MAX4372H
R
SENSE
V
SENSE
LOAD/
BATTERY
OUT
2
MAX4372T
MAX4372F
MAX4372H
4
RS+
B
V
CC
3
MAX4372T
MAX4372F
RS+
MAX4372H
RS-
V
CC
RS+
V
IN
0 TO 28V
UCSP
SOT23
Pin Configurations continued at end of datasheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
19-1548; Rev 5; 5/11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
