MAX4377FAUA [ROCHESTER]

1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, MICRO MAX PACKAGE-8;
MAX4377FAUA
型号: MAX4377FAUA
厂家: Rochester Electronics    Rochester Electronics
描述:

1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, MICRO MAX PACKAGE-8

信息通信管理 光电二极管
文件: 总12页 (文件大小:1072K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
19-1781; Rev 5; 6/10  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
General Description  
Features  
6/MAX4378  
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:  
o Low-Cost, Single/Dual/Quad, High-Side Current-  
Sense Amplifiers  
o ±±0.5 Tꢀpical Full-Scale Accuracꢀ  
o +3V to +28V Supplꢀ Operation  
o Adjustable Current-Sense Capabilitꢀ with External  
Sense Resistor  
o Buffered Output Voltage with 2mA Drive  
o 1mA (tꢀp) Supplꢀ Current  
GAIN  
20  
SUFFIX  
T
F
H
o 20±MHz Bandwidth (Gain = +2±V/V)  
o Automotive Temperature Range (-4±°C to +12.°C)  
50  
100  
o High Accuracꢀ +2V to +28V Common-Mode  
Range, Functional Down to ±V, Independent of  
Supplꢀ Voltage  
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.  
o Three Gain Versions Available  
+2±V/V (MAX437_T)  
+.±V/V (MAX437_F)  
+1±±V/V (MAX437_H)  
o Available in Space-Saving .-Pin SOT23 (Single),  
8-Pin µMAX (Dual), and 14-Pin TSSOP (Quad)  
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.  
Ordering Information  
GAIN  
TEMP  
PIN-  
TOP  
PART  
(+V/V)  
RANGE  
PACKAGE MARK  
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.  
MAX4376TAUK+T  
MAX4376FAUK+T  
MAX4376HAUK+T  
20  
50  
-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  
5 SOT23  
5 SOT23  
5 SOT23  
5 SOT23  
8 SO  
ADOG  
ADOH  
ADOI  
AFGO  
100  
MAX4376HAUK/V+T 100  
MAX4376TASA+  
MAX4376FASA+  
20  
50  
8 SO  
Ordering Information continued at end of data sheet0  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
The MAX4376 is available in a tiny 5-pin SOT23 pack-  
age. The MAX4377/MAX4378 are available in space-  
Pin Configurations  
®
saving 8-pin µMAX and 14-pin TSSOP packages,  
respectively.  
TOP VIEW  
Applications  
+
Notebook Computers  
Current-Limited Power  
Supplies  
Fuel Gauges in PC  
General-System/Board-  
Level Current Monitoring  
Portable/Battery-Powered  
Systems  
Cell Phones  
Smart Battery Packages  
Automotive Current Detect  
Power Management  
Systems  
OUT  
GND  
1
2
3
5
4
RS-  
RS+  
MAX4376  
V
CC  
Battery Chargers  
SOT23  
PA Bias Control  
Pin Configurations continued at end of data sheet.  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, deliverꢀ, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www0maxim-ic0com0  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
ABSOLUTE MAXIMUM RATINGS  
CC  
OUT to GND ...............................................-0.3V to (V + 0.3V)  
V
, RS+, RS- to GND ...........................................-0.3V to +30V  
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  
Soldering Temperature (reflow) .......................................+260°C  
CC  
Differential Input Voltage (V  
- V  
)................................. 8V  
RS+  
RS-  
Output Short Circuit to V ........................................Continuous  
CC  
Output Short Circuit to GND.....................................................1s  
Current into Any Pin.......................................................... 20mA  
Continuous Power Dissipation (T = +70°C)  
A
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  
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  
= 0 to 28V, V  
= (V  
- V  
) = 0V, V  
= +3.0V to +28V, R = , T = T  
to T  
unless otherwise noted. Typical  
MAX,  
RS+  
SENSE  
RS+  
RS-  
CC  
L
A
MIN  
values are at T = 25°C.) (Note 1)  
A
PARAMETER  
Operating Voltage Range  
Common-Mode Input Range  
Common-Mode Rejection  
Supply Current per Amplifier  
Leakage Current  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
28  
UNITS  
V
V
Guaranteed by PSR test  
Guaranteed by total OUT voltage error test  
2V V 28V, V = 100mV  
3
0
CC  
CM  
V
28  
V
CMR  
90  
1
dB  
mA  
µA  
RS+  
SENSE  
I
V
V
V
V
V
V
= 5mV, V  
> 2.0V, V  
= 12V  
2.2  
8
CC  
SENSE  
RS+  
CC  
I
, I  
= 0V, V  
= 28V  
RS+  
RS+ RS-  
CC  
> 2.0V  
0
60  
RS+  
RS+  
RS+  
RS+  
I
RS+  
2.0V  
-400  
0
60  
Input Bias Current  
µA  
6/MAX4378  
> 2.0V  
120  
120  
I
RS-  
2.0V  
-800  
Full-Scale Sense Voltage  
V
150  
0.5  
mV  
SENSE  
V
V
= 100mV,  
SENSE  
CC  
6.75  
3.25  
11  
= 12V, V  
= 12V  
RS+  
V
V
= 100mV,  
SENSE  
= 12V, T = +25°C  
CC  
A
V
V
= 100mV,  
SENSE  
= 28V, V  
= 28V  
CC  
RS+  
V
V
= 100mV,  
SENSE  
Total OUT Voltage Error (Note 2)  
I
2mA  
%
OUT  
= 28V, V  
= 28V,  
0.5  
9
5
CC  
RS+  
T
A
= +25°C  
V
V
= 100mV,  
SENSE  
CC  
32  
= 12V, V  
= 0.1V  
RS+  
V
V
= 6.25mV,  
SENSE  
= 12V, V  
= 12V  
7
CC  
RS+  
(Note 3)  
= 3V, I = 2mA  
OUT  
OUT High Voltage (Note 4)  
OUT Low Voltage  
(V - V  
) V  
0.9  
25  
1.2  
40  
V
CC OUT  
CC  
I
= 200µA, V  
= V  
= 12V,  
RS+  
OUT  
CC  
V
mV  
OL  
V
= 0V, T = +25°C  
A
SENSE  
2
_______________________________________________________________________________________  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
6/MAX4378  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
= 0 to 28V, V  
= (V  
- V  
) = 0V, V  
= +3.0V to +28V, R = , T = T  
to T  
unless otherwise noted. Typical  
MAX,  
RS+  
SENSE  
RS+  
RS-  
CC  
L
A
MIN  
values are at T = 25°C.) (Note 1)  
A
PARAMETER  
SYMBOL  
BW  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
V
= 100mV  
SENSE  
2
(gain = +20V/V)  
V
SENSE  
= 100mV  
V
V
C
= 12V  
CC  
1.7  
1.2  
(gain = +50V/V)  
Bandwidth  
= 12V  
MHz  
RS+  
= 15pF  
LOAD  
V
= 100mV  
SENSE  
(gain = +100V/V)  
V
= 6.25mV (Note 3)  
0.5  
10  
SENSE  
Slew Rate  
Gain  
SR  
V
= 20mV to 100mV, C  
= 15pF  
to T  
V/µs  
V/V  
SENSE  
LOAD  
+20  
+50  
+100  
MAX437_T  
MAX437_F  
MAX437_H  
A
V
V
V
= 10mV to 150mV,  
T = T  
A
5.5  
2.5  
5.5  
2.5  
SENSE  
MIN  
MAX  
= 12V, I  
= 2mA,  
CC  
OUT  
T
= +25°C  
0.5  
gain = 20 and 50  
A
Gain Accuracy  
A  
%
V
V
V
= 10mV to 150mV,  
T = T  
A
to T  
MAX  
SENSE  
MIN  
= 20V, I  
= 2mA,  
CC  
OUT  
T
A
= +25°C  
0.5  
gain = 100  
V
= 6.25mV  
SENSE  
400  
to 100mV  
OUT Setting Time to 1% of Final  
Value  
V
C
= 12V, V  
CC RS+  
= 12V,  
ns  
= 15pF  
LOAD  
V
= 100mV  
SENSE  
800  
to 6.25mV  
Maximum Capacitive Load  
Output Resistance  
C
No sustained oscillation  
1000  
5
pF  
LOAD  
R
V
V
= 100mV  
OUT  
SENSE  
RS+  
Power-Supply Rejection  
PSR  
> 2V, V  
= 1.6V, V  
= 3V to 28V  
66  
90  
dB  
OUT  
CC  
Power-Up Time to 1% of Final  
Value  
V
= 100mV, C  
= 15pF  
2
1
1
µs  
µs  
µs  
SENSE  
LOAD  
Saturation Recovery Time to 1%  
of Final Value  
V
V
= 12V, V  
= 12V, C  
= 15pF,  
= 15pF,  
CC  
RS+  
LOAD  
= 100mV  
SENSE  
Reverse Recovery Time to 1%  
of Final Value  
V
V
= 12V, V _ = 12V, C  
CC RS  
LOAD  
= -100mV to +100mV  
SENSE  
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.  
A
Note 2: Total OUT Voltage Error is the sum of gain and offset errors.  
Note 3: 6.25mV = 1/16 of 100mV full-scale sense voltage.  
Note 4: V  
such that V  
is in saturation.  
SENSE  
OUT  
_______________________________________________________________________________________  
3
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
Typical Operating Characteristics  
(V  
= V  
= 12V, V  
= 100mV, T = +25°C.)  
SENSE A  
CC  
RS+  
SUPPLY CURRENT (PER AMPLIFIER)  
vs. TEMPERATURE  
SUPPLY CURRENT (PER AMPLIFIER)  
vs. SUPPLY VOLTAGE  
TOTAL OUTPUT ERROR  
vs. SUPPLY VOLTAGE (V  
= 100mV)  
SENSE  
1.00  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
1.2  
1.0  
MAX4376H  
0.95  
0.90  
0.85  
0.80  
0.75  
0.70  
0.65  
0.60  
0.55  
0.50  
0.8  
MAX4376H  
MAX4376F  
MAX4376T  
MAX4376T  
0.6  
MAX4376F  
MAX4376F  
MAX4376T  
0.4  
0.2  
0.0  
-0.2  
-0.4  
-0.6  
-0.8  
-1.0  
MAX4376H  
-50 -25  
0
25  
50  
75 100 125  
0
5
10  
15  
20  
25  
30  
0
5
10  
15  
20  
25  
30  
TEMPERATURE (°C)  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
TOTAL OUTPUT ERROR  
vs. COMMON-MODE VOLTAGE  
TOTAL OUTPUT ERROR  
vs. SUPPLY VOLTAGE (V = 6.25mV)  
SENSE  
1.0  
0.8  
0.6  
0.4  
0.2  
0
6
5
MAX4376H  
4
3
MAX4376H  
MAX4376F  
2
6/MAX4378  
1
-0.2  
-0.4  
-0.6  
-0.8  
0
-1  
-2  
-3  
-4  
MAX4376T  
10  
MAX4376F  
MAX4376T  
-1.0  
0
5
10  
15  
20  
25  
30  
0
5
15  
20  
25  
30  
COMMON-MODE VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
TOTAL OUTPUT ERROR  
vs. TEMPERATURE  
GAIN ACCURACY  
vs. TEMPERATURE  
1.0  
0.8  
2.0  
1.5  
1.0  
0.5  
0
0.6  
MAX4376F  
MAX4376T  
0.4  
MAX4376H  
MAX4376F  
0.2  
0
-0.2  
-0.4  
-0.6  
-0.8  
-1.0  
-0.5  
-1.0  
-1.5  
-2.0  
MAX4376H  
MAX4376T  
-50 -25  
0
25 50 75 100 125 150  
-50 -25  
0
25  
50  
75 100 125  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
4
_______________________________________________________________________________________  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
6/MAX4378  
Typical Operating Characteristics (continued)  
(V  
= V  
= 12V, V  
= 100mV, T = +25°C.)  
SENSE A  
CC  
RS+  
MAX4376T  
SMALL-SIGNAL TRANSIENT RESPONSE  
TOTAL OUTPUT ERROR  
vs. FULL-SCALE SENSE VOLTAGE  
(V  
= 95mV TO 100mV)  
SENSE  
5
4
C = 15pF  
L
R =1kΩ  
L
100mV  
95mV  
IN  
5mV/div  
3
2
MAX4376H  
MAX4376F  
1
2.0V  
1.9V  
0
OUT  
50mV/div  
-1  
MAX4376T  
-2  
0
50  
100  
(mV)  
150  
200  
2µs/div  
V
SENSE  
MAX4376F  
SMALL-SIGNAL TRANSIENT RESPONSE  
MAX4376H  
SMALL-SIGNAL TRANSIENT RESPONSE  
(V  
SENSE  
= 95mV TO 100mV)  
(V  
= 95mV to 100mV)  
SENSE  
C = 15pF  
L
R = 2.5kΩ  
L
C = 15pF  
L
R = 5kΩ  
L
100mV  
95mV  
100mV  
IN  
IN  
5mV/div  
5mV/div  
95mV  
5V  
10V  
OUT  
100mV/div  
OUT  
200mV/div  
4.75V  
9.5V  
2µs/div  
2µs/div  
MAX4376F  
LARGE-SIGNAL TRANSIENT RESPONSE  
MAX4376T  
LARGE-SIGNAL TRANSIENT RESPONSE  
(V  
= 6mV to 100mV)  
(V  
= 6mV to 100mV)  
SENSE  
SENSE  
C = 15pF  
L
C = 15pF  
L
R = 2.5kΩ  
L
R = 1kΩ  
L
100mV  
6mV  
100mV  
IN  
IN  
45mV/div  
45mV/div  
6mV  
2V  
5V  
OUT  
500mV/div  
OUT  
2V/div  
0.3V  
0.120V  
2µs/div  
2µs/div  
_______________________________________________________________________________________  
.
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
Typical Operating Characteristics (continued)  
(V  
= V  
= 12V, V  
= 100mV, T = +25°C.)  
CC  
RS+  
SENSE  
A
MAX4376H  
LARGE-SIGNAL TRANSIENT RESPONSE  
SMALL-SIGNAL GAIN  
vs. FREQUENCY  
(V  
SENSE  
= 6mV to 100mV)  
45  
40  
35  
30  
25  
20  
15  
10  
5
C = 15pF  
L
R = 5kΩ  
L
MAX4376H  
100mV  
IN  
MAX4376F  
45mV/div  
6mV  
10V  
MAX4376T  
OUT  
3V/div  
0.6V  
0
2µs/div  
1.E+04  
1.E+05  
1.E+06  
1.E+07  
FREQUENCY (Hz)  
OUTPUT LOW  
vs. TEMPERATURE  
OVERDRIVE RESPONSE  
AV = +20V/V  
MAX4376/7/8 toc16  
400  
350  
300  
250  
200  
150  
100  
50  
750mV  
350mV  
IN  
200mV/div  
6/MAX4378  
MAX4376T  
MAX4376F  
MAX4376H  
V
OH  
OUT  
2V/div  
7V  
0
-50 -25  
0
25  
50  
75 100 125  
TIME (500ns)  
TEMPERATURE (°C)  
6
_______________________________________________________________________________________  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
6/MAX4378  
Pin Description  
PIN  
MAX4376  
MAX4376  
MAX4377  
MAX4378  
NAME  
FUNCTION  
µMAX-8/  
SO-8  
SO-14/  
TSSOP-14  
SOT23-5  
SO-8  
Output Voltage. V  
is proportional to the magnitude  
OUT_  
of the sense voltage (V  
approximately zero when V  
reversal).  
- V ). V  
is  
RS+  
RS-  
OUT_  
1
4
1, 7  
1, 7, 8, 14  
OUT, OUT_  
GND  
> V  
(no phase  
RS -  
RS - +  
2
3
3
4
8
11  
4
Ground  
1
V
Supply Voltage  
CC  
4
8
6
3, 5  
2, 6  
3, 5, 10, 12  
2, 6, 9, 13  
RS+, RS_+  
RS-, RS_-  
N.C.  
Power connection to the external sense resistor  
Load-side connection to the external sense resistor  
No Connection. Not internally connected.  
5
2, 5, 7  
Set the full-scale output range by selecting R  
the appropriate gain version of the MAX4376/  
MAX4377/MAX4378.  
and  
SENSE  
Detailed Description  
The MAX4376/MAX4377/MAX4378 high-side current-  
sense amplifiers feature a 0 to +28V input common-mode  
range that is independent of supply voltage. This feature  
allows the monitoring of current out of a battery in deep  
discharge and also enables high-side current sensing at  
Applications Information  
Recommended Component Values  
The MAX4376/MAX4377/MAX4378 sense a wide variety  
of currents with different sense resistor values. Table 1  
lists common resistor values for typical operation of the  
MAX4376/MAX4377/MAX4378.  
voltages greater than the supply voltage (V ).  
CC  
The MAX4376/MAX4377/MAX4378 operate as follows:  
current from the source flows through R  
to the  
SENSE  
load (Figure 1). Since the internal sense amplifier’s  
inverting input has high impedance, negligible current  
flows through RG2 (neglecting the input bias current).  
Therefore, the sense amplifier’s inverting-input voltage  
Choosing R  
SENSE  
To measure lower currents more accurately, use a high  
value for R . The high value develops a higher  
SENSE  
equals V  
- (I  
)(R  
).  
SOURCE  
LOAD  
SENSE  
sense voltage that reduces offset voltage errors of the  
internal op amp.  
The amplifier’s open-loop gain forces its noninverting  
input to the same voltage as the inverting input.  
In applications monitoring very high currents, R  
2
SENSE  
Therefore, the drop across RG1 equals (I  
)
LOAD  
must be able to dissipate the I R losses. If the resistor’s  
rated power dissipation is exceeded, its value may drift  
or it may fail altogether, causing a differential voltage  
across the terminals in excess of the absolute maxi-  
mum ratings.  
(R  
LOAD  
). Since I  
flows through RG1, I  
=
SENSE  
RG1  
RG1  
(I  
)(R  
RG1  
. Solving I  
)/RG1. The internal current mirror multi-  
SENSE  
plies I  
by a current gain factor, β, to give I  
= β x  
RGD  
)/RG1.  
SENSE  
I
= β x (I  
)(R  
RG1  
RGD  
LOAD  
Therefore:  
If I  
has a large high-frequency component, mini-  
SENSE  
mize the inductance of R  
. Wire-wound resistors  
V
OUT  
= β x (RGD/RG1)(R  
x I  
) x amp gain  
LOAD  
SENSE  
SENSE  
have the highest inductance, metal-film resistors are  
somewhat better, and low-inductance metal-film resis-  
tors are best suited for these applications.  
where amp gain is 2, 5, or 10.  
The part’s gain equals (β x RGD / RG1) x amp gain.  
Bidirectional Current-Sense Amplifier  
Systems such as laptop computers and other devices  
that have internal charge circuitry require a precise  
bidirectional current-sense amplifier to monitor accu-  
rately the battery’s current regardless of polarity. Figure  
2 shows the MAX4377 used as a bidirectional current  
Therefore:  
V
OUT  
= (GAIN)(R  
)(I  
)
SENSE LOAD  
where GAIN = 20 for MAX437_T.  
GAIN = 50 for MAX437_F.  
GAIN = 100 for MAX437_H.  
_______________________________________________________________________________________  
7
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
Table 10 Recommended Component Values  
FULL-SCALE OUTPUT VOLTAGE  
FULL-SCALE LOAD  
CURRENT-SENSE  
RESISTOR, R (m)  
(FULL-SCALE V  
= 1±±mV),  
GAIN (+V/V)  
SENSE  
CURRENT, I  
(A)  
LOAD  
SENSE  
V
OUT  
(V)  
0.1  
1000  
20  
50  
2.0  
5.0  
100  
20  
10.0  
2.0  
1
5
100  
20  
50  
5.0  
100  
20  
10.0  
2.0  
50  
5.0  
100  
20  
10.0  
2.0  
10  
10  
50  
5.0  
100  
10.0  
I
LOAD  
R
SENSE  
TO LOAD BATTERY  
V
SOURCE  
R
SENSE  
SYSTEM  
AND  
CHARGER  
0 TO +28V  
BATTERY  
RS+  
RS-  
+3V TO +28V  
I
RG1  
R
MAX4376  
+3V TO +28V  
R
G1  
G2  
V
CC  
V
CC  
6/MAX4378  
RS1+  
RS1-  
A1  
OUT1  
MAX4377  
V
OUT  
CURRENT  
MIRROR  
OUT  
OUT  
A
= 2, 5,  
V
OR 10  
I
RGD  
RS2-  
RGD  
OUT2  
GND  
RS2+  
Figure 1. Functional Diagram  
monitor. This is useful for implementing either smart  
battery packs or fuel gauges.  
Figure 2. Bidirectional Current Monitor  
Current Source Circuit  
Figure 3 shows a block diagram using the MAX4376  
with a switching regulator to make a current source.  
8
_______________________________________________________________________________________  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
6/MAX4378  
Chip Information  
I
LOAD  
V
SENSE  
PROCESS: BiCMOS  
V
IN  
0 TO +18V  
MAX1745  
LOW-COST  
SWITCHING  
REGULATOR  
R
SENSE  
RS+  
RS-  
+3V TO +28V  
V
CC  
0.1µF  
MAX4376  
LOAD/  
BATTERY  
OUT  
GND  
Figure 3. Current Source  
Pin Configurations (continued)  
TOP VIEW  
+
+
+
V
1
2
3
4
8
7
6
5
RS+  
OUT1  
RS1-  
RS1+  
GND  
1
2
3
4
8
7
6
5
V
OUT1  
RS1-  
RS1+  
1
2
3
14 OUT4  
13 RS4-  
12 RS4+  
CC  
CC  
N.C.  
GND  
OUT  
N.C.  
RS-  
OUT2  
RS2-  
RS2+  
MAX4376  
MAX4377  
MAX4378  
N.C.  
V
4
5
6
7
11 GND  
10 RS3+  
CC  
RS2+  
RS2-  
OUT2  
SO  
µMAX/SO  
9
8
RS3-  
OUT3  
SO/TSSOP  
Ordering Information (continued)  
Typical Operating Circuit  
GAIN  
(+V/V)  
TEMP  
RANGE  
PIN-  
TOP  
PART  
I
LOAD  
V
SENSE  
PACKAGE MARK  
0 TO +28V  
MAX4377TAUA+  
MAX4377FAUA+  
MAX4377HAUA+  
MAX4377TASA+  
MAX4377FASA+  
MAX4377HASA+  
MAX4378TAUD+  
MAX4378FAUD+  
MAX4378HAUD+  
MAX4378TASD+  
MAX4378FASD+  
MAX4378HASD+  
20  
50  
-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  
-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  
8 µMAX  
8 µMAX  
8 µMAX  
8 SO  
R
SENSE  
RS+  
RS-  
+3V TO +28V  
100  
20  
V
CC  
0.1µF  
50  
8 SO  
100  
20  
8 SO  
MAX4376T/F/H  
14 TSSOP  
14 TSSOP  
14 TSSOP  
14 SO  
A/D  
CONVERTER  
LOAD/  
BATTERY  
50  
OUT  
100  
20  
GND  
50  
14 SO  
100  
14 SO  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
_______________________________________________________________________________________  
9
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
Package Information  
For the latest package outline information and land patterns, go to www0maxim-ic0com/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.  
LAND  
PATTERN NO0  
PACKAGE TYPE  
PACKAGE CODE  
OUTLINE NO0  
5 SOT  
U5+1  
S8+2  
21-±±.7  
21-±±41  
9±-±174  
9±-±±96  
8 SOIC  
8 µMAX  
14 SOIC  
14 TSSOP  
U8+1  
S14+1  
U14+1  
21-±±36  
21-±±41  
21-±±66  
9±-±±92  
9±-±±96  
9±-±117  
6/MAX4378  
1± ______________________________________________________________________________________  
Single/Dual/Quad, High-Side Current-Sense  
Amplifiers with Internal Gain  
6/MAX4378  
Revision History  
REVISION  
NUMBER  
REVISION  
DATE  
PAGES  
CHANGED  
DESCRIPTION  
4
4/09  
Added automotive part number and lead-free designations  
1, 9  
Clarified 0V to 2V is not a high-accuracy range for the device, added soldering  
temperature and Package Information section  
5
6/10  
1, 2, 10  
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  
© 2010 Maxim Integrated Products  
Maxim is a registered trademark of Maxim Integrated Products, Inc.  

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