MAX4373 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs

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.
________________________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
Pin Configurations appear at end of data sheet.
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
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
Ordering Information continues at end of data sheet.
Typical Operating Circuit
V_IN = 0 TO 28V
V_CC = 2.7V TO 28V
C1
0.1µF
V_PULL-UP = 5V
R3
+ V_SENSE -
R_SENSE
RS+
RS-
V_CC
I_LOAD
LOAD/
BATTERY
MAX4373
OUT
R1
CIN
COUT
RESET
R2
GND
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