MAX4378 Maxim, MAX4378 Datasheet

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MAX4378

Manufacturer Part Number
MAX4378
Description
The MAX4376/MAX4377/MAX4378 single, dual, and quad precision high-side current-sense amplifiers are available in space-saving packages
Manufacturer
Maxim
Datasheet
1.MAX4376.pdf (11 pages)

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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:
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
respectively.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-1781; Rev 6; 2/11
Notebook Computers
Current-Limited Power
Supplies
Fuel Gauges in PC
General-System/Board-
Level Current Monitoring
Battery Chargers
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.
Single/Dual/Quad, High-Side Current-Sense
GAIN
100
20
50
________________________________________________________________ Maxim Integrated Products
®
and 14-pin TSSOP packages,
General Description
Portable/Battery-Powered
Systems
Cell Phones
Smart Battery Packages
Automotive Current Detect
Power Management
Systems
PA Bias Control
SUFFIX
T
F
H
Applications
Amplifiers with Internal Gain
o Low-Cost, Single/Dual/Quad, High-Side Current-
o ±0.5% Typical Full-Scale Accuracy
o +3V to +28V Supply Operation
o Adjustable Current-Sense Capability with External
o Buffered Output Voltage with 2mA Drive
o 1mA (typ) Supply Current
o 2.0MHz Bandwidth (Gain = +20V/V)
o Automotive Temperature Range (-40°C to +125°C)
o High Accuracy +2V to +28V Common-Mode
o Three Gain Versions Available
o Available in Space-Saving 5-Pin SOT23 (Single),
Ordering Information continued at end of data sheet.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations continued at end of data sheet.
MAX4376 T AUK+T
MAX4376FAUK+T
MAX4376HAUK+T
M AX 4376H A U K/V + T
MAX4376TASA+
MAX4376FASA+
Sense Amplifiers
Sense Resistor
Range, Functional Down to 0V, Independent of
Supply Voltage
8-Pin µMAX (Dual), and 14-Pin TSSOP (Quad)
+20V/V (MAX437_T)
+50V/V (MAX437_F)
+100V/V (MAX437_H)
PART
TOP VIEW
GND
OUT
V
CC
(+V/V)
GAIN
100
100
20
50
20
50
1
2
3
Ordering Information
+
MAX4376
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
SOT23
Pin Configurations
RANGE
TEMP
5
4
RS-
RS+
PIN-
PACKAGE
5 SOT23
5 SOT23
5 SOT23
5 SOT23
8 SO
8 SO
Features
ADOG
ADOH
MARK
AFGO
ADOI
TOP
—
—
1

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MAX4378 Summary of contents

Page 1

... 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. ...

Page 2

... Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

Page 3

... A PARAMETER SYMBOL Bandwidth Slew Rate Gain Gain Accuracy OUT Setting Time Final Value Maximum Capacitive Load C Output Resistance Power-Supply Rejection Power-Up Time Final Value Saturation Recovery Time Final Value Reverse Recovery Time Final Value Note 1: All devices are 100% production tested at T Note 2: Total OUT Voltage Error is the sum of gain and offset errors ...

Page 4

Single/Dual/Quad, High-Side Current-Sense Amplifiers with Internal Gain ( 12V 100mV RS+ SENSE SUPPLY CURRENT (PER AMPLIFIER) vs. SUPPLY VOLTAGE 1.00 MAX4376H 0.95 0.90 MAX4376F MAX4376F 0.85 MAX4376T 0.80 0.75 0.70 0.65 0.60 0.55 ...

Page 5

Single/Dual/Quad, High-Side Current-Sense ( 12V 100mV RS+ SENSE TOTAL OUTPUT ERROR vs. FULL-SCALE SENSE VOLTAGE MAX4376F MAX4376T - 100 V (mV) SENSE MAX4376F SMALL-SIGNAL ...

Page 6

Single/Dual/Quad, High-Side Current-Sense Amplifiers with Internal Gain ( 12V 100mV RS+ SENSE MAX4376H LARGE-SIGNAL TRANSIENT RESPONSE (V = 6mV to 100mV) SENSE C = 15pF 5kΩ 45mV/div OUT ...

Page 7

... N.C. No Connection. Not internally connected. Set the full-scale output range by selecting R the appropriate gain version of the MAX4376/ MAX4377/MAX4378. The MAX4376/MAX4377/MAX4378 sense a wide variety ). CC of currents with different sense resistor values. Table 1 lists common resistor values for typical operation of the to the SENSE MAX4376/MAX4377/MAX4378 ...

Page 8

Single/Dual/Quad, High-Side Current-Sense Amplifiers with Internal Gain Table 1. Recommended Component Values FULL-SCALE LOAD CURRENT-SENSE CURRENT, I (A) RESISTOR, R LOAD 0 LOAD R SENSE V SOURCE 0 TO +28V RS+ RS- I RG1 +3V TO ...

Page 9

... MAX4377HAUA+ 100 -40°C to +125°C MAX4377TASA+ 20 -40°C to +125°C MAX4377FASA+ 50 -40°C to +125°C MAX4377HASA+ 100 -40°C to +125°C MAX4378 T AUD+ 20 -40°C to +125°C MAX4378FAUD+ 50 -40°C to +125°C MAX4378HAUD+ 100 -40°C to +125°C MAX4378TASD+ 20 -40°C to +125°C ...

Page 10

... Amplifiers with Internal Gain For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 11

... Specified V Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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