MAX4073TAXK [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO5, MO-203, SC-70, 5 PIN;
| 型号： | MAX4073TAXK |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO5, MO-203, SC-70, 5 PIN 光电二极管 |
| 文件： | 总10页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2048; Rev 0; 4/01
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
General Description
Features
The MAX4073 low-cost, high-side current-sense ampli-
fier features a voltage output that eliminates the need
for gain-setting resistors making it ideal for cell phones,
notebook computers, PDAs, and other systems where
current monitoring is crucial. High-side current moni-
toring does not interfere with the ground path of the
battery charger making the MAX4073 particularly useful
in battery-powered systems. The input common-mode
range of +2V to +28V is independent of the supply volt-
age. The MAX4073’s wide 1.8MHz bandwidth makes it
suitable for use inside battery-charger control loops.
♦ Low-Cost, Compact, Current-Sense Solution
♦ Three Gain Versions Available
+20V/V (MAX4073T)
+50V/V (MAX4073F)
+100V/V (MAX4073H)
♦
1ꢀ0ꢁ Full-Scale Accuracꢂ
♦ 500µA Supplꢂ Current
♦ Wide 1ꢀ8MHz Bandwidth
♦ +3V to +28V Operating Supplꢂ
The combination of three gain versions and a selec-
table external-sense resistor sets the full-scale current
reading. The MAX4073 offers a high level of integra-
tion, resulting in a simple and compact current-sense
solution.
♦ Wide +2V to +28V Common-Mode Range
Independent of Supplꢂ Voltage
♦ Automotive Temperature Range (-40°C to +125°C)
♦ Available in Space-Saving 5-Pin SC70 Package
The MAX4073 operates from a +3V to +28V single sup-
ply and draws only 0.5mA of supply current. This
device is specified over the automotive operating tem-
perature range (-40°C to +125°C) and is available in a
space-saving 5-pin SC70 package (half the size of the
SOT23).
Typical Operating Circuit
I
LOAD
V
SENSE
+2V TO +28V
For a similar device in a 6-pin SOT23 with a wider com-
mon-mode voltage range (0 to +28V), see the
MAX4173 data sheet.
R
SENSE
RS+
RS-
+3V TO +28V
V
CC
Applications
Cell Phones
Notebook Computers
0.1µF
MAX4073T/F/H
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
PDAs
A/D
CONVERTER
LOAD/
BATTERY
OUT
GND
Power Management Systems
PA Bias Control
General System/Board-Level Current Monitoring
Precision Current Sources
Pin Configurations appear at end of data sheet.
Ordering Information
PART
TEMPꢀ 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 SC70-5
GAIN (V/V)
TOP MARK
ACM
MAX4073TAXK-T
MAX4073TAUT-T
MAX4073FAXK-T
MAX4073FAUT-T
MAX4073HAXK-T
MAX4073HAUT-T
20
20
6 SOT23-6
5 SC70-5
AAUE
ACN
50
6 SOT23-6
5 SC70-5
50
AAUF
ACO
100
100
6 SOT23-6
AAUG
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
ABSOLUTE MAXIMUM RATINGS
CC
RS+, RS- to GND....................................................-0.3V to +30V
OUT to GND ...............................................-0.3V to (V + 0.3V)
V
to GND............................................................-0.3V to +30V
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
CC
Output Short-Circuit to GND ......................................Continuous
Differential Input Voltage (V - V ) ................................. 5V
RS+
RS-
Current Into Any Pin.......................................................... 20mA
Continuous Power Dissipation (T = +70°C)
A
5-pin SC70 (derate 2.27mW/°C above +70°C)............200mW
6-pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
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
= +2V to +28V, V
= (V
- V ) = 0, V
= +3V to +28V, T = T
A
to T , unless otherwise noted. Typical values are
MAX
RS+
SENSE
RS+
RS-
CC
MIN
at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
3
TYP
MAX
28
UNITS
V
Operating Voltage Range
Common-Mode Input Range
V
(Note 2)
(Note 3)
CC
V
2
28
V
CMR
Common-Mode Rejection
Supply Current
CMR
V
V
V
= 100mV, V
= 12V
90
0.5
0.05
20
dB
mA
µA
SENSE
CC
I
= 28V
1.2
1
CC
CC
CC
Leakage Current
I
/I
= 0, V
= 28V
RS+ RS-
RS+
I
60
120
RS+
Input Bias Current
µA
I
40
RS-
Full-Scale Sense Voltage
V
V
V
= (V
- V )
RS-
150
mV
SENSE
SENSE
SENSE
RS+
= 100mV, V
= 12V, V
= 2V
RS+
1.0
1.0
CC
V
V
= 100mV, V
= 12V,
SENSE
CC
5.0
7.0
5.0
8.5
= 12V, T = +25oC
RS+
A
V
V
= 100mV, V
= 12V, T = T
= 12V,
SENSE
CC
to T
MAX
RS+
A
MIN
Total OUT Voltage Error (Note 4)
%
V
V
= 100mV, V
= 28V,
SENSE
CC
1.0
= 28V, T = +25oC
RS+
A
V
V
= 100mV, V
= 28V, T = T
= 28V,
SENSE
CC
to T
MAX
RS+
A
MIN
V
V
= 6.25mV (Note 5); V
= 12V
= 12V,
CC
SENSE
7.5
1.0
RS+
Extrapolated Input Offset Voltage
OUT High Voltage
V
V
= V
= 12V, V > 10mV
SENSE
mV
V
OS
- V
CC
RS+
MAX4073T, V = 3V
CC
V
=
SENSE
(V
)
MAX4073F, V = 7.5V
0.8
1.2
CC
OH
CC
150mV
MAX4073H, V
= 15V
CC
2
_______________________________________________________________________________________
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2V to +28V, V
= (V
- V ) = 0, V
= +3V to +28V, T = T
A
to T , unless otherwise noted. Typical values are
MAX
RS+
SENSE
RS+
RS-
CC
MIN
at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4073T,
1.8
V
= 100mV
SENSE
MAX4073F,
= 100mV
1.7
1.6
600
MHz
V
V
C
= 12V,
= 12V,
RS+
CC
V
SENSE
Bandwidth
BW
MAX4073H,
= 5pF
LOAD
V
SENSE = 100mV
MAX4073T/F/H
kHz
V/V
V
SENSE = 6.25mV (Note 5)
MAX4073T
MAX4073F
MAX4073H
20
50
A
Gain
V
100
V
V
V
CC = 12V,
RS+ = 12V,
SENSE = 10mV
T
T
A = +25°C
1.0
4.5
6.5
to 150mV,
MAX4073T/F
T
T
A = MIN to MAX
∆A
Gain Accuracy
V
%
V
V
V
CC = 12V,
RS+ = 12V,
SENSE = 10mV
T
T
A = +25°C
1.0
4.5
6.5
to 100mV,
MAX4073H
T
T
A = MIN to MAX
V
= 6.25mV to
= 100mV to
SENSE
400
800
V
V
C
CC = 12V
RS+ = 12V
OUT Settling Time to 1% of Final
Value
100mV
ns
V
SENSE
= 5pF
LOAD
6.25mV
Output Resistance
R
12
78
85
90
5
kΩ
OUT
V
= 60mV, MAX4073T
= 24mV, MAX4073F
= 12mV, MAX4073H
70
70
70
SENSE
Power-Supply Rejection Ratio
Power-Up Time (Note 6)
PSRR
V
V
SENSE
dB
CC = 3V to 28V
V
SENSE
C
= 5pF, V
= 100mV
µs
µs
LOAD
SENSE
Saturation Recovery Time
(Note 7)
V
C
= 12V, V
= 12V,
RS+
CC
5
= 5pF
LOAD
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.
A
Note 2: Inferred from PSRR test.
Note 3: Inferred from OUT Voltage Error test.
Note 4: Total OUT Voltage Error is the sum of the gain and offset errors.
Note 5: 6.25mV = 1/16 of 100mV full-scale sense voltage.
Note 6: Output settles to within 1% of final value.
Note 7: The device will not experience phase reversal when overdriven.
_______________________________________________________________________________________
3
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Typical Operating Characteristics
(V
= +12V, V
= +12V, V
= 100mV, C = 5pF, T = +25°C, unless otherwise noted.)
SENSE
L A
CC
RS+
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
SUPPLY CURRENT vs.
TEMPERATURE
1.5
0.53
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
V
= 0
= +28V
SENSE
CC
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.52
0.51
0.50
0.49
0.48
0.47
0.46
0.45
0.44
0.43
MAX4073H
MAX4073F
MAX4073H
MAX4073F
MAX4073T
MAX4073T
V
= 6.25mV
V
= 100mV
SENSE
SENSE
0
5
10
15
20
25
30
-50 -25
0
25
50
75 100 125
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
TEMPERATURE (˚C)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs.
SUPPLY CURRENT vs.
OUTPUT HIGH VOLTAGE
(V - V ) vs. TEMPERATURE
V
VOLTAGE
V
VOLTAGE
RS+
RS+
CC
OH
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.54
0.53
0.52
0.51
0.50
0.49
0.48
0.47
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 100mV
SENSE
V
= 6.25mV
V
= 150mV
SENSE
SENSE
MAX4073H
MAX4073H
MAX4073F
MAX4073T
MAX4073F
MAX4073T
0
5
10
15
(V)
20
25
30
0
5
10
15
20
25
30
-50 -25
0
25
50
75 100 125
V
V
(V)
TEMPERATURE (°C)
RS+
RS+
TOTAL OUTPUT ERROR vs.
SUPPLY VOLTAGE
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
TOTAL OUTPUT ERROR
vs. COMMON-MODE VOLTAGE
1.0
0.8
2.0
1.5
1.0
0.5
0
1.0
0.5
V
= 100mV
V
= 6.25mV
SENSE
SENSE
MAX4073F
0.6
0
0.4
MAX4073H
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.5
-1.0
-1.5
-2.0
MAX4073T
0
5
10
15
20
25
30
0
5
10
15
20
25
30
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
4
_______________________________________________________________________________________
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
= +12V, V
= +12V, V = 100mV, C = 5pF, T = +25°C, unless otherwise noted.)
SENSE
CC
RS+
L
A
GAIN ACCURACY
vs. TEMPERATURE
SMALL-SIGNAL GAIN vs.
FREQUENCY
TOTAL OUTPUT ERROR
vs. TEMPERATURE
1.0
2.0
45
40
35
30
V
= (10mV - 100mV)
MAX4073H
MAX4073F
SENSE
0.8
0.6
1.5
1.0
0.5
0
V
CC
= +12V
0.4
MAX4073T
0.2
25
20
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.5
-1.0
V
= +28V
15
10
5
CC
-1.5
-2.0
0
-50 -25
0
25
75 100 125
0.1
1
10
FREQUENCY (kHz)
50
100
1000
10,000
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX4073T SMALL-SIGNAL
TRANSIENT RESPONSE
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX4073 toc14
100
90
MAX4073H
100mV
95mV
MAX4073F
MAX4073T
80
V
SENSE
2.5mV/div
70
60
2V
50
40
30
20
OUT
50mV/div
1.9V
1µs/div
1000
0.1
1
10
100
FREQUENCY (kHz)
MAX4073H SMALL-SIGNAL
TRANSIENT RESPONSE
MAX4073F SMALL-SIGNAL
TRANSIENT RESPONSE
MAX4073 toc16
MAX4073 toc15
100mV
95mV
10V
100mV
95mV
V
V
SENSE
2.5mV/div
SENSE
2.5mV/div
5V
OUT
125mV/div
OUT
250mV/div
9.5V
4.75V
1µs/div
1µs/div
_______________________________________________________________________________________
5
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
= +12V, V
= +12V, V
= 100mV, C = 5pF, T = +25°C, unless otherwise noted.)
CC
RS+
SENSE
L
A
MAX4073T LARGE-SIGNAL
TRANSIENT RESPONSE
MAX4073F LARGE-SIGNAL
TRANSIENT RESPONSE
MAX4073 toc17
MAX4073 toc18
100mV
6.25mV
100mV
6.25mV
V
SENSE
45mV/div
V
SENSE
45mV/div
2V
5V
OUT
0.9V/div
OUT
2.35V/div
0.120V
0.3V
1µs/div
1µs/div
MAX4073H LARGE-SIGNAL
TRANSIENT RESPONSE
MAX4073T
OVERDRIVE RESPONSE
MAX4073 toc20
MAX4073 toc19
V
= +3V
CC
250mV
50mV
100mV
6.25mV
V
V
SENSE
100mV/div
SENSE
45mV/div
V
OH
10V
OUT
4.7V/div
OUT
600mV/div
0.6V
1V
1µs/div
1µs/div
MAX4073T
START-UP DELAY
MAX4073 toc21
V
CC
= 0 to +4V
4V
V
CC
2V/div
0
2V
OUT
1V/div
0
1µs/div
6
_______________________________________________________________________________________
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Pin Description
PIN
NAME
GND
FUNCTION
SOT23-6
SC70-5
1, 2
2
Ground
3
4
5
3
4
5
V
Supply Voltage Input. Bypass to GND with a 0.1µF capacitor.
Power-Side Connection to the External Sense Resistor
Load-Side Connection to the External Sense Resistor
CC
RS+
RS-
Voltage Output. V
12kΩ.
is proportional to V . Output impedance is approximately
SENSE
OUT
6
1
OUT
Detailed Description
I
LOAD
R
SENSE
TO LOAD/BATTERY
The MAX4073 high-side current-sense amplifier fea-
tures a +2V to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current out of a battery as low as +2V and
also enables high-side current sensing at voltages
V
SOURCE
+2V TO +28V
RS+
RS-
I
RG1
+3V TO +28V
R
R
G1
G2
V
CC
greater than the supply voltage (V ).
CC
The MAX4073 operates as follows: current from the
source flows through R
to the load (Figure 1). Since
SENSE
A1
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 equals
MAX4073T/F/H
V
- (I
)(R
). The amplifier’s open-loop
SOURCE
LOAD
SENSE
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
V
OUT
CURRENT
MIRROR
OUT
I
equals (I
)(R
). Since I
flows through RG1,
RGD
LOAD SENSE
RG1
I
= (I
)(R ) / RG1. The internal current mirror
RG1
LOAD SENSE
multiplies I
by a current gain factor, β, to give
RGD = 12kΩ
RG1
= β ✕ I
I
. Solving I
= β ✕ (I
)(R
OUT
) /
RGD
RGD
RG1
RGD
LOAD SENSE
GND
RG1. Assuming infinite output impedance, V
= (I
OUT
)
(RGD). Substituting in for I
and rearranging, V
). The parts gain equals
LOAD
=
RGD
✕ I
β ✕ (RGD / RG1)(R
SENSE
β ✕ RGD / RG1. Therefore, V
= (GAIN) (R
)
SENSE
OUT
Figure 1. Functional Diagram
(I
), where GAIN = 20V/V for MAX4073T, GAIN =
LOAD
50V/V for MAX4073F, and GAIN = 100V/V for MAX4073H.
higher-sense voltage that reduces offset voltage errors
of the internal op amp. Typical sense voltages range
between 10mV and 150mV.
Set the full-scale output range by selecting R
the appropriate gain version of the MAX4073.
and
SENSE
In applications monitoring very high currents, R
SENSE
Applications Information
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 ( 5V).
Recommended Component Values
The MAX4073 senses a wide variety of currents with
different sense resistor values. Table 1 lists common
resistor values for typical operation of the MAX4073.
If I
has a large high-frequency component, mini-
SENSE
Choosing R
SENSE
mize the inductance of R
. Wire-wound resistors
SENSE
To measure lower currents more accurately, use a
large value for R . The larger value develops a
have the highest inductance, metal-film resistors are
SENSE
_______________________________________________________________________________________
7
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
somewhat better, and low-inductance metal-film resis-
INPUT
LOAD/BATTERY
0.3in COPPER
tors are best suited for these applications.
R
SENSE
0.3in COPPER
0.1in COPPER
For V
= 100mV, full-scale output voltage can be
SENSE
_
+
2V, 5V, or 10V depending on the gain. For proper oper-
ation, ensure V exceeds the full-scale output voltage
V
SENSE
CC
by 1.2V (see Output High Voltage (V
Temperature in the Typical Operating Characteristics).
- V ) vs.
OH
CC
RS+
RS-
+3V TO +28V
V
CC
0.1µF
Using a PCB Trace as R
SENSE
If the cost of R
is an issue and accuracy is not
SENSE
MAX4073T
OUT
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.
GND
Figure 2. MAX4073T Connections Showing Use of PC Board
For example, the MAX4073T (with a maximum load cur-
I
rent of 10A and an R
of 5mΩ) creates a full-scale
LOAD
SENSE
V
SENSE
LOW-COST
SWITCHING
REGULATOR
V
IN
+2V TO +28V
V
of 50mV that yields a maximum V
in this case requires about 2 inches of 0.1 inch-
of 1V.
OUT
SENSE
R
R
SENSE
SENSE
wide copper trace.
RS+
RS-
+3V TO +28V
V
CC
Output Impedance
0.1µF
The output of the MAX4073 is a current source driving a
12kΩ resistance. Resistive loading added to OUT
reduces the output gain of the MAX4073. 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
amp’s supply voltage range should be at least as high
as any voltage the system may encounter.
MAX4073T/F/H
LOAD/
BATTERY
OUT
GND
Figure 3. Current Source
The percent error introduced by output loading is deter-
mined with the following formula:
R
LOAD
%
= 100
− 1
ERROR
12kΩ + R
LOAD
where R
is the external load applied to OUT.
LOAD
Current Source Circuit
Figure 3 shows a block diagram using the MAX4073
with a switching regulator to make a current source.
8
_______________________________________________________________________________________
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Table 1ꢀ Recommended Component Values
FULL-SCALE OUTPUT VOLTAGE
(FULL-SCALE V = 100mV)
FULL-SCALE LOAD CURRENT
CURRENT-SENSE RESISTOR
GAIN
SENSE
I
(A)
R
(mΩ)
LOAD
SENSE
V
OUT
(V)
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
100
20
10.0
2.0
10
10
50
5.0
100
10.0
Pin Configurations
TOP VIEW
GND
GND
OUT
GND
1
2
3
5
4
RS-
RS+
1
2
3
6
5
4
OUT
RS-
RS+
MAX4073T/F/H
MAX4073T/F/H
V
V
CC
CC
SOT23-6
SC70-5
Chip Information
TRANSISTOR COUNT: 187
PROCESS: Bipolar
_______________________________________________________________________________________
9
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
Package Information
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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