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General Description
The MAX4373/MAX4374/MAX4375 low-cost, micropow-
er, high-side current-sense supervisors contain a high-
side current-sense amplifier, bandgap reference, and
comparator with latching output. They feature a voltage
output that eliminates the need for gain-setting resistors,
making them 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 battery-powered systems since it
does not interfere with the ground path of the battery
charger. The 0 to +28V input common-mode range is
independent of the supply voltage, which ensures that
the current-sense feedback remains viable even when
connected to a battery pack in deep discharge.
The comparator output of the MAX4373/MAX4374/
MAX4375 is latched to provide a turn-off flag that
doesn’t oscillate. In addition, the MAX4374/MAX4375
contain a second comparator for use in window-detec-
tion functions. The MAX4373/MAX4374/MAX4375 are
available in three different gain versions (T = +20V/V,
F = +50V/V, H = +100V/V) and use an external sense
resistor to set the sensitivity of the input voltage to the
load current. These features offer a high level of inte-
gration, resulting in a simple and compact current-
sense solution.
The MAX4373/MAX4374/MAX4375 operate from a sin-
gle +2.7V to +28V supply and consume 50µA. They are
specified for the extended operating temperature range
(-40°C to +85°C) and are available in 8-pin and 10-pin
µMAX® packages.
Applications
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General-System/Board-Level Current Monitoring
Precision Current Sources
Features
♦ Current-Sense Amplifier plus Internal Comparator
and Bandgap Reference with Improved Accuracy
♦ 50µA Supply Current
♦ Single +2.7V to +28V Operating Supply
♦ 1mV (max) Input Offset Voltage
♦ 2% (max) Full-Scale Accuracy
♦ Internal Bandgap Reference (±1.6% Accuracy)
♦ Latching Comparator Output
♦ Three Gain Versions Available (+20V/V, +50V/V,
+100V/V)
♦ High Accuracy +2V to +28V Common-Mode
Range, Functional Down to 0V, Independent of
Supply Voltage
MAX4373/MAX4374/MAX4375
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
________________________________________________________________
Maxim Integrated Products
1
MAX4373
RS-RS+
OUT
CIN
LOAD/
BATTERY
V
CC
= 2.7V TO 28V
V
IN
= 0 TO 28V
GND
V
CC
R
SENSE
+ V
SENSE
-
I
LOAD
V
PULL-UP
(UP TO 5V)
R3
COUT
C1
0.1µF
R2
R1
RESET
Typical Operating Circuit
19-1630; Rev 4; 1/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Pin Configurations appear at end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Ordering Information
PART TEMP RANGE
PIN-
PACKAGE
GAIN
(V/V)
MAX4373TEUA+ -40°C to +85°C 8 µMAX +20
MAX4373TESA+ -40°C to +85°C 8 SO +20
MAX4373FEUA+ -40°C to +85°C 8 µMAX +50
MAX4373FESA+ -40°C to +85°C 8 SO +50
MAX4373HEUA+ -40°C to +85°C 8 µMAX +100
MAX4373HESA+ -40°C to +85°C 8 SO +100
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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