MAX4173TEUT-T [MAXIM]
Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier; 低成本， SOT23封装，电压输出，高边电流检测放大器
| 型号： | MAX4173TEUT-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier |
| 文件： | 总12页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1434; Rev 1; 5/99
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX4173 low-cost, precision, high-side current-
sense amplifier is available in a tiny SOT23-6 package.
It features a voltage output that eliminates the need for
gain-setting resistors and it is ideal for today’s notebook
computers, cell phones, and other systems where cur-
rent monitoring is critical. High-side current monitoring
is especially useful in battery-powered systems, since it
does not interfere with the ground path of the battery
charger. The input common-mode range of 0 to +28V is
independent of the supply voltage and ensures that the
current-sense feedback remains viable even when con-
nected to a battery in deep discharge. The MAX4173’s
wide 1.7MHz bandwidth makes it suitable for use inside
battery charger control loops.
♦ Low-Cost, Compact Current-Sense Solution
♦ Wide 0 to +28V Common-Mode Range
Independent of Supply Voltage
♦ Three Gain Versions Available
+20V/V (MAX4173T)
+50V/V (MAX4173F)
+100V/V (MAX4173H)
♦ ±0.5% Full-Scale Accuracy
♦ 420µA Supply Current
♦ Wide 1.7MHz Bandwidth (MAX4173T)
♦ +3V to +28V Operating Supply
♦ Available in Space-Saving SOT23-6 Package
The combination of three gain versions and a user-
selectable external sense resistor sets the full-scale
current reading. This feature offers a high level of inte-
gration, resulting in a simple and compact current-
sense solution.
Typ ic a l Op e ra t in g Circ u it
The MAX4173 operates from a single +3V to +28V sup-
ply, typically draws only 420µA of supply current over
the extended operating temperature range (-40°C to
+85°C), and is offered in the space-saving SOT23-6
package.
I
LOAD
V
SENSE
0 TO +28V
R
SENSE
RS+
RS-
Ap p lic a t io n s
Notebook Computers
+3V TO +28V
V
CC
0.1µF
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
MAX4173T/F/H
A/D
CONVERTER
LOAD/
BATTERY
OUT
Power-Management Systems
General System/Board-Level Current Monitoring
PA Bias Control
GND
Precision Current Sources
Ord e rin g In fo rm a t io n
PART
GAIN (V/V)
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
8 SO
SOT TOP MARK
MAX4173TEUT-T
MAX4173TESA
MAX4173FEUT-T
MAX4173FESA
MAX4173HEUT-T
MAX4173HESA
20
20
AABN
–
AABD
–
50
6 SOT23-6
8 SO
50
100
100
6 SOT23-6
8 SO
AABP
–
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
ABSOLUTE MAXIMUM RATINGS
V
CC
, RS+, RS- to GND .......................................... -0.3V to +30V
Continuous Power Dissipation (T = +70°C)
A
OUT to GND .............................................. -0.3V to (V + 0.3V)
8-Pin SO (derate 5.88mW/°C above +70°C)............... 471mW
SOT23-6 (derate 8.7mW/°C above +70°C)................. 696mW
Operating Temperature Range .......................... -40°C to +85°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +300°C
CC
Output Short-Circuit to V or GND ......................... Continuous
CC
Differential Input Voltage (V
- V ) ............................. ±0.3V
RS+
RS-
Current into Any Pin......................................................... ±20mA
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.
MAX4173TF/H
ELECTRICAL CHARACTERISTICS
(V
= 0 to +28V, V = +3V to +28V, V
= 0, T = T
to T
, R
= ∞ unless otherwise noted. Typical values are at
RS+
CC
SENSE
A
MIN
MAX LOAD
T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
28
UNITS
V
Operating Voltage Range
Common-Mode Input Range
Common-Mode Rejection
Supply Current
V
CC
Guaranteed by PSR test
(Note 2)
3
0
V
CMR
28
V
CMR
V
> +2.0V
90
0.42
0.3
dB
RS+
I
CC
V
RS+
> +2.0V, V = 12V
1.0
3
mA
µA
CC
Leakage Current
I
, I
V
CC
= 0
RS+ RS-
V
> +2.0V
≤ +2.0V
> +2.0V
≤ +2.0V
0
50
RS+
I
RS+
V
RS+
-350
0
50
Input Bias Current
µA
V
RS+
100
100
I
RS-
V
RS+
-700
Full-Scale Sense Voltage
V
SENSE
V
SENSE
= V
- V
RS-
150
mV
RS+
V
= +100mV, V = +12V, V
RS+
= +12V
= +12V,
±0.5
5.75
3.25
SENSE
CC
V
SENSE
= +100mV, V = +12V, V
CC RS+
= +25°C
0.5
T
A
Total OUT Voltage Error
(Note 3)
V
= +100mV, V = +28V, V
RS+
= +28V
= +0.1V
0.5
-9
5.75
±24
%
V
SENSE
CC
V
SENSE
= +100mV, V = +12V, V
CC RS+
V
= +12V, V
=+12V, V = +6.25mV
SENSE
CC
RS+
±7.5
(Note 4)
MAX4173T, V = +3.0V
0.8
0.8
0.8
1.2
1.2
1.2
CC
OUT High Voltage
(Note 5)
(V
V
OH
-
)
CC
MAX4173F, V = +7.5V
CC
MAX4173H, V = +15V
CC
2
_______________________________________________________________________________________
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
ELECTRICAL CHARACTERISTICS (continued)
(V
= 0 to +28V, V = +3V to +28V, V
CC
= 0, T = T
A
to T
, R
= ∞ unless otherwise noted. Typical values are at
RS+
SENSE
MIN
MAX LOAD
T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4173T,
1.7
V
SENSE
= +100mV,
MAX4173F,
= +100mV,
1.4
1.2
0.6
V
= +12V,
= +12V,
RS+
V
SENSE
Bandwidth
BW
V
MHz
CC
MAX4173H,
C
= 5pF
LOAD
V
SENSE
= +100mV,
V
SENSE
= +6.25mV,
(Note 4)
MAX4173T
MAX4173F
MAX4173H
20
50
Gain
A
V/V
%
V
100
MAX4173T/F
T
= -40°C to +85°C
= +25°C
4.0
±2.5
4.0
A
V
SENSE
= +10mV
to +150mV
T
A
0.5
∆A
Gain Accuracy
V
MAX4173H
T
A
= -40°C to +85°C
= +25°C
V
SENSE
= +10mV
to +100mV
T
A
0.5
400
800
±2.5
V
V
RS+
= +12V,
= +12V,
V
SENSE
= +6.25mV to +100mV
CC
OUT Settling Time to 1% of
Final Value
ns
C
= 5pF
V
SENSE
= +100mV to +6.25mV
LOAD
kΩ
dB
OUT Output Resistance
Power-Supply Rejection
R
12
84
91
95
OUT
MAX4173T, V
MAX4173F, V
= 80mV, V
≥ +2V
≥ +2V
≥ +2V
60
60
60
SENSE
RS+
PSR
= 32mV, V
RS+
SENSE
MAX4173H, V
= 16mV, V
RS+
SENSE
Power-Up Time to 1% of Final
Value
V
= +100mV, C
= 5pF
LOAD
10
10
µs
µs
SENSE
Saturation Recovery Time
V
CC
= +12V, V
= +12V (Note 6)
RS+
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.
A
Note 2: Guaranteed by Total Output Voltage Error Test.
Note 3: Total OUT Voltage Error is the sum of gain and offset voltage errors.
Note 4: +6.25mV = 1/16 of +100mV full-scale voltage.
Note 5: V
such that output stage is in saturation.
SENSE
Note 6: The device does not experience phase reversal when overdriven.
_______________________________________________________________________________________
3
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +12V, V
= +12V, V
= +100mV, T = +25°C, unless otherwise noted.)
CC
RS+
SENSE
A
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. RS+ VOLTAGE
440
550
500
450
400
350
300
250
200
150
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
MAX4173T
430
420
410
400
390
380
370
MAX4173T
MAX4173H
MAX4173F
MAX4173F
MAX4173H
MAX4173T
MAX4173F
MAX4173TF/H
MAX4173H
0
5
10
15
20
25
30
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
0
0.5
1.0
1.5
(V)
2.0
2.5
28
SUPPLY VOLTAGE (V)
V
RS+
TOTAL OUTPUT ERROR vs.
FULL-SCALE SENSE VOLTAGE
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
TOTAL OUTPUT ERROR vs.
SUPPLY VOLTAGE
6
4
0.60
0.45
0.30
0.15
0
4
3
V
CC
= 28V
MAX4173H
MAX4173T
2
2
MAX4173T
MAX4173H
0
1
MAX4173H
MAX4173F
MAX4173F
-0.15
-0.30
-0.45
-0.60
-2
-4
-6
0
MAX4173T
-1
-2
MAX4173F
150
V
= 6.25mV
10
SENSE
V
= 100mV
SENSE
0
5
15
20
25
30
0
50
100
(mV)
200
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
V
SUPPLY VOLTAGE (V)
SENSE
TOTAL OUTPUT ERROR vs.
COMMON-MODE VOLTAGE
POWER-SUPPLY REJECTION
vs. FREQUENCY
GAIN ACCURACY vs. TEMPERATURE
1.2
0.8
0
6
4
-10
-20
-30
-40
-50
-60
-70
-80
-90
MAX4173H
MAX4173T
2
MAX4173T
MAX4173H
0.4
0
0
-2
-4
-6
-8
-10
MAX4173F
-0.4
-0.8
-1.2
MAX4173F
-100
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
0
5
10
15
20
25
30
100
1k
10k
100k
1M
10M
COMMON-MODE VOLTAGE (V)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
SENSE A
(V = +12V, V
= +12V, V
= +100mV, T = +25°C, unless otherwise noted.)
CC
RS+
MAX4173T
LARGE-SIGNAL TRANSIENT RESPONSE
TOTAL OUTPUT ERROR
vs. TEMPERATURE
(V
= 6mV to 100mV)
SENSE
2.0
1.5
1.0
0.5
0
C = 5pF
L
100mV
MAX4173H
MAX4173T
IN
(45mV/div)
6mV
2V
-0.5
-1.0
-1.5
-2.0
MAX4173F
OUT
(500mV/div)
0.120V
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
2µs/div
MAX4173F
MAX4173H
LARGE-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 6mV to 100mV)
(V
SENSE
= 6mV to 100mV)
C = 5pF
L
C = 5pF
L
100mV
6mV
100mV
IN
IN
(45mV/div)
(45mV/div)
6mV
10V
5V
OUT
OUT
(3V/div)
(2V/div)
0.6V
0.3V
2µs/div
2µs/div
MAX4173F
MAX4173T
SMALL-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
(V
SENSE
= 95mV TO 100mV)
(V
SENSE
= 95mV TO 100mV)
C = 5pF
L
C = 5pF
L
100mV
95mV
100mV
95mV
IN
(5mV/div)
IN
(5mV/div)
2.0V
1.9V
5V
OUT
(50mV/div)
OUT
(100mV/div)
4.75V
2µs/div
2µs/div
_______________________________________________________________________________________
5
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
SENSE A
(V = +12V, V
= +12V, V
= +100mV, T = +25°C, unless otherwise noted.)
CC
RS+
MAX4173H
START-UP DELAY (V = 0 to 4V)
SMALL-SIGNAL TRANSIENT RESPONSE
CC
(V
SENSE
= 100mV)
(V
SENSE
= 95mV to 100mV)
C = 5pF
L
4V
0V
100mV
IN
(5mV/div)
IN
(2V/div)
95mV
2V
0V
10V
OUT
(1V/div)
MAX4173TF/H
OUT
(200mV/div)
9.5V
5µs/div
2µs/div
P in De s c rip t io n
PIN
NAME
FUNCTION
SOT23-6
SO
3
1, 2
3
GND
Ground
1
V
Supply Voltage Input. Bypass to GND with a 0.1µF capacitor.
Power-Side Connection to the External Sense Resistor
Load-Side Connection for the External Sense Resistor
CC
4
8
RS+
RS-
5
6
Voltage Output. V
approximately 12kΩ.
is proportional to V
( V
- V
). Output impedance is
OUT
SENSE
RS+
RS-
6
–
4
OUT
N.C.
2, 5, 7
No Connection. Not internally connected.
6
_______________________________________________________________________________________
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
Set the full-scale output range by selecting R
the appropriate gain version of the MAX4173.
and
SENSE
De t a ile d De s c rip t io n
The MAX4173 high-side current-sense amplifier fea -
tures 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 voltages
Ap p lic a t io n s In fo rm a t io n
Re c o m m e n d e d Co m p o n e n t Va lu e s
The MAX4173 senses a wide variety of currents with
different sense resistor values. Table 1 lists common
resistor values for typical operation of the MAX4173.
greater than the supply voltage (V ).
CC
The MAX4173 operates as follows: Current from the
source flows through R
to the load (Figure 1). Since
SENSE
Ch o o s in g R
S ENS E
To measure lower currents more accurately, use a high
value for R . The high value develops a higher
the internal-sense amplifier’s inverting input has high
imp e d a nc e , ne g lig ib le c urre nt flows throug h RG2
(ne g le c ting the inp ut b ia s c urre nt). The re fore , the
s e ns e a mp lifie r’s inve rting -inp ut volta g e e q ua ls
SENSE
sense voltage that reduces offset voltage errors of the
internal op amp.
V
- (I
)(R
). The amplifier’s open-loop
SOURCE
LOAD
SENSE
In applications monitoring very high currents, R
SENSE
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
must be able to dissipate the I2R 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.
equals (I
)(R
). Since I
flows through RG1,
LOAD SENSE
RG1
I
= (I )(R ) / RG1. The internal current mirror
LOAD SENSE
RG1
multip lie s I
b y a c urre nt g a in fa c tor, β, to g ive
. Solving I
RG1
= β · I
I
= β · (I
)(R
) /
RGD
RG1
RGD
LOAD
SENSE
If I has a large high-frequency component, mini-
SENSE
mize the inductance of R . Wire-wound resistors
have the highest inductance, metal-film resistors are
somewhat better, and low-inductance metal-film resis-
tors are best suited for these applications.
RG1. Assuming infinite output impedance, V
(RGD). Substituting in for I
= (I
)
OUT
RGD
and rearranging, V
). The parts gain equals
=
SENSE
RGD
· I
OUT
β · (RGD / RG1)(R
SENSE LOAD
β · RGD / RG1. Therefore, V
= (GAIN) (R
)
OUT
SENSE
(I ), where GAIN = 20 for MAX4173T, GAIN = 50 for
LOAD
MAX4173F, and GAIN = 100 for MAX4173H.
Us in g a P CB Tra c e a s R
SENSE
S ENS E
is an issue and accuracy is not
If the cost of R
critical, use the alternative solution shown in Figure 2.
This solution uses copper PC board traces to create a
sense resistor. The resistivity of a 0.1-inch-wide trace of
2-ounce copper is approximately 30mΩ/ft. The resis-
tance-temperature coefficient of copper is fairly high
(approximately 0.4%/°C), so systems that experience a
wide temperature variance must compensate for this
effect. In addition, do not exceed the maximum power
dissipation of the copper trace.
I
LOAD
R
SENSE
TO LOAD BATTERY
V
SOURCE
0 TO +28V
RS+
RS-
I
RG1
+3V TO +28V
R
G1
R
G2
V
CC
For example, the MAX4173T (with a maximum load cur-
A1
rent of 10A and an R
of 5mΩ) creates a full-scale
SENSE
V
SENSE
of 50mV that yields a maximum V
of 1V.
OUT
R
in this case requires about 2 inches of 0.1 inch-
SENSE
wide copper trace.
MAX4173
OUT
V
OUT
Ou t p u t Im p e d a n c e
CURRENT
MIRROR
The output of the MAX4173 is a current source driving a
12kΩ re s is ta nc e . Re s is tive loa d ing a d d e d to OUT
reduces the output gain of the MAX4173. To minimize
output errors for most applications, connect OUT to a
high-impedance input stage. When output buffering is
required, choose an op amp with a common-mode
input range and an output voltage swing that includes
ground when operating with a single supply. The op
I
RGD
RGD = 12k
GND
Figure 1. Functional Diagram
_______________________________________________________________________________________
7
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
Table 1. Recommended Component Values
FULL-SCALE OUTPUT VOLTAGE
(FULL-SCALE V = 100mV)
CURRENT-SENSE RESISTOR
FULL-SCALE LOAD CURRENT
GAIN
SENSE
R
(mΩ)
I
(A)
SENSE
LOAD
V
(V)
OUT
20
50
2.0
0.1
1000
5.0
100
20
10.0
2.0
1
5
100
20
50
5.0
100
20
10.0
2.0
50
5.0
MAX4173TF/H
100
20
10.0
2.0
10
10
50
5.0
100
10.0
INPUT
0.3 in. COPPER
LOAD/BATTERY
R
SENSE
I
LOAD
V
SENSE
LOW-COST
SWITCHING
REGULATOR
V
IN
0.1 in. COPPER
0.3 in. COPPER
0 TO +28V
_
+
V
SENSE
R
SENSE
RS+
RS-
+3V TO +28V
RS+
RS-
+3V TO +28V
V
CC
V
CC
0.1µF
0.1µF
MAX4173
GND
MAX4173T
OUT
LOAD/
BATTERY
OUT
GND
Figure 2. MAX4173 Connections Showing Use of PC Board
Figure 3. Current Source
amp’s supply voltage range should be at least as high
as any voltage the system may encounter.
Cu rre n t S o u rc e Circ u it
Figure 3 shows a block diagram using the MAX4173
with a switching regulator to make a current source.
The p e rc e nt e rror introd uc e d b y outp ut loa d ing is
determined with the following formula:
R
LOAD
%
= 100
− 1
ERROR
12kΩ + R
LOAD
where R
is the external load applied to OUT.
LOAD
8
_______________________________________________________________________________________
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
P in Co n fig u ra t io n s
TOP VIEW
GND
GND
1
2
3
6
OUT
RS-
V
1
2
3
4
8
7
6
5
RS+
N.C.
RS-
CC
MAX4173
N.C.
GND
OUT
MAX4173
5
4
V
CC
RS+
N.C.
SOT23-6
SO
Ch ip In fo rm a t io n
TRANSISTOR COUNT: 187
_______________________________________________________________________________________
9
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
P a c k a g e In fo rm a t io n
MAX4173TF/H
10 ______________________________________________________________________________________
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
MAX4173TF/H
P a c k a g e In fo rm a t io n (c o n t in u e d )
______________________________________________________________________________________ 11
Lo w -Co s t , S OT2 3 , Vo lt a g e -Ou t p u t ,
Hig h -S id e Cu rre n t -S e n s e Am p lifie r
NOTES
MAX4173TF/H
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.
12 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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