19-1781; Rev 2; 10/00
Single/Dual/Quad High-Side Current-Sense
Amplifiers with Internal Gain
General Description
The MAX4376/MAX4377/MAX4378 single, dual, and
quad precision high-side current-sense amplifiers are
available in space-saving packages. They feature
buffered voltage outputs that eliminate the need for
gain-setting resistors and are ideal for today鈥檚 notebook
computers, cell phones, and other systems where cur-
rent monitoring is critical. These precision devices are
offered in three fixed-gain versions of 20, 50, and 100:
GAIN
SUFFIX
20
T
50
F
100
H
For example, MAX4376TAUK is a single high-side
amplifier with a gain of 20.
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
supply voltage and ensures that the current-sense
feedback remains viable even when connected to a
battery pack in deep discharge.
The full-scale current reading can be set by choosing
the appropriate voltage gain and external-sense resis-
tor. This capability offers a high level of integration and
flexibility, resulting in a simple and compact current-
sense solution.
The MAX4376/MAX4377/MAX4378 operate over a sup-
ply voltage range of +3V to +28V, draw 1mA of supply
current per amplifier, and operate over the full automo-
tive temperature range of -40擄C to +125擄C. These
devices have a wide bandwidth of 2MHz, making them
suitable for use inside battery-charger control loops.
The buffered outputs drive up to 2mA of output current
into a ground-referenced load.
The MAX4376 is available in a tiny 5-pin SOT23 pack-
age. The MAX4377/MAX4378 are available in space-
saving 8-pin 碌MAX and 14-pin TSSOP packages,
respectively.
Features
o
Low-Cost Single/Dual/Quad High-Side Current-
Sense Amplifiers
o
鹵0.5% Typical Full-Scale Accuracy
o
+3V to +28V Supply Operation
o
Adjustable Current-Sense Capability with External
Sense Resistor
o
Buffered Output Voltage with 2mA Drive
o
1mA (typ) Supply Current
o
2.0MHz Bandwidth (Gain = +20V/V)
o
Automotive Temperature Range (-40擄C to +125擄C)
o
Full 0 to 28V Common-Mode Range, Independent
of Supply Voltage
o
Three Gain Versions Available
+20V/V (MAX437_T)
+50V/V (MAX437_F)
+100V/V (MAX437_H)
o
Available in Space-Saving 5-pin SOT23 (Single),
8-pin 碌MAX (Dual), and 14-pin TSSOP (Quad)
MAX4376/MAX4377/MAX4378
Ordering Information
PART
MAX4376
T AUK-T
MAX4376FAUK-T
MAX4376HAUK-T
MAX4376TASA
MAX4376FASA
MAX4376HASA
GAIN
(+V/+V)
20
50
100
20
50
100
TEMP.
RANGE
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
8 SO
8 SO
8 SO
TOP
MARK
ADOG
ADOH
ADOI
鈥?/div>
鈥?/div>
鈥?/div>
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
OUT
1
Applications
5
RS-
Notebook Computers
Current-Limited Power
Supplies
Fuel Gauges in PC
General-System/Board-
Level Current Monitoring
Battery Chargers
Portable/Battery-Powered
Systems
Cell Phones
Smart Battery Packages
Automotive Current Detect
Power Management
Systems
PA Bias Control
GND
2
MAX4376
V
CC
3
4
RS+
SOT23
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
Maxim
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