19-1630; Rev 0; 3/00
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
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.
Features
o
Current-Sense Amplifier plus Internal Comparator
and Bandgap Reference
o
50µA Supply Current
o
Single +2.7V to +28V Operating Supply
o
0.66% Full-Scale Accuracy
o
Internal Bandgap Reference
o
Latching Comparator Output
o
Three Gain Versions Available (+20V/V, +50V/V,
+100V/V)
o
Wide 0 to +28V Common-Mode Range,
Independent of Supply Voltage
MAX4373/MAX4374/MAX4375
Ordering Information
PART
MAX4373TEUA
MAX4373TESA
MAX4373FEUA
MAX4373FESA
MAX4373HEUA
MAX4373HESA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
GAIN
(V/V)
+20
+20
+50
+50
+100
+100
Ordering Information continues at end of data sheet.
________________________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
V
PULL-UP
= 5V
R3
V
CC
= 2.7V TO 28V
C1
0.1µF
V
IN
= 0 TO 28V
Typical Operating Circuit
+ V
SENSE
-
R
SENSE
RS+
V
CC
RS-
LOAD/
BATTERY
I
LOAD
MAX4373
OUT
R1
CIN
R2
GND
COUT
RESET
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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For small orders, phone 1-800-835-8769.
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