MAX4376_09 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Single/Dual/Quad, High-Side Current-Sense Amplifiers with Internal Gain

19-1781; Rev 4; 4/09
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’s 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°C to +125°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 µMAX and 14-pin TSSOP packages,
respectively.
Applications
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
Features
♦ Low-Cost, Single/Dual/Quad, High-Side Current-
Sense Amplifiers
♦ ±0.5% Typical Full-Scale Accuracy
♦ +3V to +28V Supply Operation
♦ Adjustable Current-Sense Capability with External
Sense Resistor
♦ Buffered Output Voltage with 2mA Drive
♦ 1mA (typ) Supply Current
♦ 2.0MHz Bandwidth (Gain = +20V/V)
♦ Automotive Temperature Range (-40°C to +125°C)
♦ Full 0 to 28V Common-Mode Range, Independent
of Supply Voltage
♦ Three Gain Versions Available
+20V/V (MAX437_T)
+50V/V (MAX437_F)
+100V/V (MAX437_H)
♦ Available in Space-Saving 5-Pin SOT23 (Single),
8-Pin µMAX (Dual), and 14-Pin TSSOP (Quad)
Ordering Information
PART
GAIN
(+V/V)
TEMP
RANGE
PIN-
TOP
PACKAGE MARK
MAX4376TAUK+T 20 -40°C to +125°C 5 SOT23
MAX4376FAUK+T 50 -40°C to +125°C 5 SOT23
MAX4376HAUK+T 100 -40°C to +125°C 5 SOT23
MAX4376HAUK/V+T 100 -40°C to +125°C 5 SOT23
MAX4376TASA+
20 -40°C to +125°C 8 SO
MAX4376FASA+
50 -40°C to +125°C 8 SO
Ordering Information continued at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
ADOG
ADOH
ADOI
AFGO
—
—
Pin Configurations
TOP VIEW
+
OUT 1
5 RS-
MAX4376
GND 2
V_CC 3
4 RS+
SOT23
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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