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.
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)
MAX4376/MAX4377/MAX4378
Ordering Information
PART
MAX4376
T AUK+T
MAX4376FAUK+T
MAX4376HAUK+T
MAX4376HAUK/V+T
MAX4376TASA+
MAX4376FASA+
GAIN
(+V/V)
20
50
100
100
20
50
TEMP
RANGE
-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
PIN-
PACKAGE
5 SOT23
5 SOT23
5 SOT23
5 SOT23
8 SO
8 SO
TOP
MARK
ADOG
ADOH
ADOI
AFGO
—
—
Ordering Information continued at end of data sheet.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations
TOP VIEW
+
OUT
1
5
RS-
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
GND
2
MAX4376
V
CC
3
4
RS+
SOT23
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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
Amplifiers with Internal Gain
MAX4376/MAX4377/MAX4378
ABSOLUTE MAXIMUM RATINGS
V
CC
, RS+, RS- to GND ...........................................-0.3V to +30V
OUT to GND ...............................................-0.3V to (V
CC
+ 0.3V)
Differential Input Voltage (V
RS+
- V
RS-
).................................±8V
Output Short Circuit to V
CC
........................................Continuous
Output Short Circuit to GND .....................................................1s
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
RS+
= 0 to 28V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, V
CC
= +3.0V to +28V, R
L
=
∞,
T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical
values are at T
A
= 25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Common-Mode Input Range
Common-Mode Rejection
Supply Current per Amplifier
Leakage Current
SYMBOL
V
CC
V
CM
CMR
I
CC
I
RS+
, I
RS-
I
RS
+
Input Bias Current
I
RS-
Full-Scale Sense Voltage
V
SENSE
V
SENSE
= 100mV,
V
CC
= 12V, V
RS+
= 12V
V
SENSE
= 100mV,
V
CC
= 12V, T
A
= +25°C
V
SENSE
= 100mV,
V
CC
= 28V, V
RS+
= 28V
Total OUT Voltage Error (Note 2)
I
OUT
≤
2mA
V
SENSE
= 100mV,
V
CC
= 28V, V
RS+
= 28V,
T
A
= +25°C
V
SENSE
= 100mV,
V
CC
= 12V, V
RS+
= 0.1V
V
SENSE
= 6.25mV,
V
CC
= 12V, V
RS+
= 12V
(Note 3)
OUT High Voltage (Note 4)
OUT Low Voltage
(V
CC
- V
OUT
) V
CC
= 3V, I
OUT
= 2mA
V
OL
I
OUT
= 200µA, V
CC
= V
RS+
= 12V,
V
SENSE
= 0V, T
A
= +25°C
±0.5
±0.5
CONDITIONS
Guaranteed by PSR test
Guaranteed by total OUT voltage error test
2V
≤
V
RS+
≤
28V, V
SENSE
= 100mV
V
SENSE
= 5mV, V
RS+
> 2.0V, V
CC
= 12V
V
CC
= 0V, V
RS+
= 28V
V
RS+
> 2.0V
V
RS+
≤
2.0V
V
RS+
> 2.0V
V
RS+
≤
2.0V
0
-400
0
-800
150
±6.75
±3.25
±11
%
MIN
3
0
90
1
2.2
8
60
60
120
120
mV
µA
TYP
MAX
28
28
UNITS
V
V
dB
mA
µA
±5
±9
±32
±7
0.9
25
1.2
40
V
mV
2
_______________________________________________________________________________________
Single/Dual/Quad, High-Side Current-Sense
Amplifiers with Internal Gain
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= 0 to 28V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, V
CC
= +3.0V to +28V, R
L
=
∞,
T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical
values are at T
A
= 25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
SENSE
= 100mV
(gain = +20V/V)
Bandwidth
BW
V
CC
= 12V
V
RS+
= 12V
C
LOAD
= 15pF
V
SENSE
= 100mV
(gain = +50V/V)
V
SENSE
= 100mV
(gain = +100V/V)
V
SENSE
= 6.25mV (Note 3)
Slew Rate
Gain
SR
A
V
V
SENSE
= 20mV to 100mV, C
LOAD
= 15pF
MAX437_T
MAX437_F
MAX437_H
V
SENSE
= 10mV to 150mV,
V
CC
= 12V, I
OUT
= 2mA,
gain = 20 and 50
V
SENSE
= 10mV to 150mV,
V
CC
= 20V, I
OUT
= 2mA,
gain = 100
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
V
SENSE
= 6.25mV
to 100mV
V
SENSE
= 100mV
to 6.25mV
±0.5
400
ns
800
1000
5
66
90
2
1
1
pF
Ω
dB
µs
µs
µs
±0.5
MIN
TYP
2
1.7
1.2
0.5
10
+20
+50
+100
±5.5
±2.5
%
5.5
±2.5
V/V
V/µs
MAX
UNITS
MAX4376/MAX4377/MAX4378
MHz
Gain Accuracy
∆A
V
OUT Setting Time to 1% of Final
Value
Maximum Capacitive Load
Output Resistance
Power-Supply Rejection
Power-Up Time to 1% of Final
Value
Saturation Recovery Time to 1%
of Final Value
Reverse Recovery Time to 1%
of Final Value
C
LOAD
R
OUT
PSR
V
CC
= 12V, V
RS+
= 12V,
C
LOAD
= 15pF
No sustained oscillation
V
SENSE
= 100mV
V
RS+
> 2V, V
OUT
= 1.6V, V
CC
= 3V to 28V
V
SENSE
= 100mV, C
LOAD
= 15pF
V
CC
= 12V, V
RS+
= 12V, C
LOAD
= 15pF,
V
SENSE
= 100mV
V
CC
= 12V, V
RS
_ = 12V, C
LOAD
= 15pF,
V
SENSE
= -100mV to +100mV
Note 1:
Note 2:
Note 3:
Note 4:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Total OUT Voltage Error is the sum of gain and offset errors.
6.25mV = 1/16 of 100mV full-scale sense voltage.
V
SENSE
such that V
OUT
is in saturation.
_______________________________________________________________________________________
3
Single/Dual/Quad, High-Side Current-Sense
Amplifiers with Internal Gain
MAX4376/MAX4377/MAX4378
Typical Operating Characteristics
(V
CC
= V
RS+
= 12V, V
SENSE
= 100mV, T
A
= +25°C.)
SUPPLY CURRENT (PER AMPLIFIER)
vs. TEMPERATURE
MAX4376/7/8 toc02
MAX4376/7/8 toc01
SUPPLY CURRENT (PER AMPLIFIER)
vs. SUPPLY VOLTAGE
1.00
0.95
0.90
SUPPLY CURRENT (mA)
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
0.2
0
-50
MAX4376T
MAX4376H
MAX4376F
1.4
1.2
SUPPLY CURRENT (mA)
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE (V
SENSE
= 100mV)
1.0
TOTAL OUTPUT ERROR (%)
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX4376H
MAX4376T
MAX4376F
MAX4376/7/8 toc03
1.2
MAX4376H
1.0
0.8
0.6
0.4
MAX4376F
MAX4376T
-25
0
25
50
75
100
125
0
5
10
15
20
25
30
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE (V
SENSE
= 6.25mV)
MAX4376/7/8 toc04
TOTAL OUTPUT ERROR
vs. COMMON-MODE VOLTAGE
0.8
TOTAL OUTPUT ERROR (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX4376F
MAX4376T
MAX4376H
MAX4376/7/8 toc05
6
5
4
TOTAL OUTPUT ERROR (%)
3
2
1
0
-1
-2
-3
-4
0
5
10
15
20
25
MAX4376T
MAX4376F
MAX4376H
1.0
30
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
GAIN ACCURACY
vs. TEMPERATURE
MAX4376/7/8 toc06
TOTAL OUTPUT ERROR
vs. TEMPERATURE
0.8
TOTAL OUTPUT ERROR (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX4376H
MAX4376T
MAX4376F
MAX4376/7/8 toc07
2.0
1.5
GAIN ACCURACY (%)
1.0
MAX4376H
0.5
0
-0.5
-1.0
-1.5
-2.0
-50
-25
0
25
50
75
100
MAX4376T
MAX4376F
1.0
125
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Single/Dual/Quad, High-Side Current-Sense
Amplifiers with Internal Gain
Typical Operating Characteristics (continued)
(V
CC
= V
RS+
= 12V, V
SENSE
= 100mV, T
A
= +25°C.)
TOTAL OUTPUT ERROR
vs. FULL-SCALE SENSE VOLTAGE
MAX4376/7/8 toc08
MAX4376/MAX4377/MAX4378
MAX4376T
SMALL-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 95mV TO 100mV)
C
L
= 15pF
R
L
=1kΩ
IN
5mV/div
MAX4376 toc09
5
4
TOTAL OUTPUT ERROR (%)
3
2
1
0
-1
-2
0
50
100
V
SENSE
(mV)
150
MAX4376T
MAX4376F
MAX4376H
100mV
95mV
2.0V
OUT
50mV/div
1.9V
200
2µs/div
MAX4376F
SMALL-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 95mV TO 100mV)
MAX4376 toc10
MAX4376H
SMALL-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 95mV to 100mV)
C
L
= 15pF
R
L
= 5kΩ
IN
5mV/div
MAX4376 toc11
C
L
= 15pF
R
L
= 2.5kΩ
IN
5mV/div
100mV
95mV
100mV
95mV
5V
OUT
100mV/div
4.75V
2µs/div
2µs/div
OUT
200mV/div
10V
9.5V
MAX4376T
LARGE-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 6mV to 100mV)
MAX4376 toc12
MAX4376F
LARGE-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 6mV to 100mV)
C
L
= 15pF
R
L
= 2.5kΩ
100mV
IN
45mV/div
MAX4376 toc13
C
L
= 15pF
R
L
= 1kΩ
IN
45mV/div
100mV
6mV
2V
6mV
5V
OUT
500mV/div
0.120V
OUT
2V/div
0.3V
2µs/div
2µs/div
_______________________________________________________________________________________
5
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