ADM4073 [ADI]
Low Cost, Voltage Output, High-Side, Current-Sense Amplifier; 低成本，电压输出，高边电流检测放大器
| 型号： | ADM4073 |
| 厂家： | 
ADI |
| 描述： | Low Cost, Voltage Output, High-Side, Current-Sense Amplifier |
| 文件： | 总12页 (文件大小：268K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Cost, Voltage Output,
High-Side, Current-Sense Amplifier
ADM4073
FUNCTIONAL BLOCK DIAGRAM
FEATURES
I
Low cost, compact, current-sense solution
Three available gain versions
20 V/V (ADM4073T)
50 V/V (ADM4073F)
100 V/V (ADM4073H)
LOAD
R
V
SENSE
2V TO 28V
OUT
RS–
RG2
RS+
RG1
I
V
RG1
AV
CC
3V TO 28V
0.1µF
Typical 1.0% full-scale accuracy
500 μA supply current
Wide 1.8 MHz bandwidth
3 V to 28 V operating supply
Wide 2 V to 28 V common-mode range
Independent of supply voltage
Operates from −40°C to +125°C
Available in a 6-lead SOT-23 package
Pin-to-pin compatibility with the MAX4073
ADM4073
V
CURRENT
MIRROR
OUT
RGD = 12kΩ
I
RGD
GND
Figure 1.
APPLICATIONS
Cell phones, PDAs
Notebook computers
APPLICATION DIAGRAM
Portable/battery-powered systems
Smart battery packs/chargers
Automotive
R
V
SENSE
2V TO 28V
OUT
Power management systems
PA bias control
General system/board-level current monitoring
Precision current sources
RS+
CC
RS–
3V TO 28V
0.1µF
V
OUT
ADC
ADM4073
GND
Figure 2.
GENERAL DESCRIPTION
The ADM4073 is a low cost, high-side, current-sense amplifier
ideal for small portable applications such as cell phones,
notebook computers, PDAs, and other systems where current
monitoring is required. The device is available in three different
gain models, eliminating the need for gain-setting resistors.
Because the ground path is not interrupted, the ADM4073 is
particularly useful in rechargeable battery-powered systems,
while its wide 1.8 MHz bandwidth makes it suitable for use
inside battery-charger control loops. The input common-mode
range of 2 V to 28 V is independent of the supply voltage.
The voltage on the output pin is determined by the current
flowing through the selectable external sense resistor and the
gain of the version selected. The operating range is 3 V to 28 V
with a typical supply current of 500 μA. The ADM4073 is
available in a 6-lead SOT-23 package and is specified over the
automotive operating temperature range (−40°C to +125°C).
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
ADM4073
TABLE OF CONTENTS
Features .............................................................................................. 1
ESD Caution...................................................................................4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics ..............................................6
Theory of Operation ...................................................................... 10
RSENSE............................................................................................. 10
Output (OUT)............................................................................. 10
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 11
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Application Diagram........................................................................ 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Characteristics .............................................................. 4
REVISION HISTORY
7/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADM4073
SPECIFICATIONS
VRS+ = 2 V to 28 V, VSENSE = (VRS+ − VRS−) = 0, VCC = 3 V to 28 V, TA = −40°C to +125°C, unless otherwise noted. Typical values are at TA = 25°C.1
Table 1.
Parameter
Min Typ
Max Unit Conditions
POWER SUPPLY
Operating Voltage Range, VCC
Common-Mode Input Range, VCMR
Common-Mode Input Rejection, CMR
Supply Current, ICC
Leakage Current, IRS+/IRS−
Input Bias Current, IRS+
Input Bias Current, IRS−
Full Scale Sense Voltage, VSENSE
Total Out Voltage Error2
3
2
28
28
V
V
Inferred from PSRR test
Inferred OUT voltage error test
VSENSE = 100 mV, VCC = 12 V
VCC = 28 V
90
0.5
0.05
20
40
150
±1
dB
mA
μA
μA
μA
mV
%
1.2
2
60
120
VCC = 0 V, VRS+ = 28 V, TA = 85°C
VSENSE = (VRS+ − VRS−
)
VSENSE = 100 mV, VCC = 12 V, VRS+ = 2 V
±1.0 ±5.0
±5.0
±1.0 ±5.0
±5.0
%
%
%
%
VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, TA = +25°C
VSENSE = 100 mV, VCC = 12 V, VRS = 12V, TA = −40°C to +125°C
VSENSE = 100 mV, VCC = 28 V, VRS = 28 V, TA = +25°C
VSENSE = 100 mV, VCC = 28 V, VRS = 28 V, TA = −40°C to +125°C
VSENSE = 6.25 mV,3 VCC = 12 V, VRS = 12 V
±±.5
%
Extrapolated Input Offset Voltage, VOS
1.0
mV
V
V
VCC = VRS+ = 12 V, VSENSE > 10 mV
VCC = 3 V, VSENSE = 150 mV (ADM40±3T)
VCC = ±.5 V, VSENSE = 150 mV (ADM40±3F)
VCC = 15 V, VSENSE = 150 mV (ADM40±3H), TA = 25°C
Out High Voltage (VCC − VOH
)
0.8
0.8
0.8
1.2
1.2
1.2
V
DYNAMIC CHARACTERISTICS
Bandwidth, BW
1.8
1.±
1.6
600
20
50
100
±1.0 ±2.0
MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM40±3T)
MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM40±3F)
MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM40±3H)
kHz
V/V
V/V
V/V
%
VSENSE = 6.25 mV,3 VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM40±3T/F/H)
Gain, AV
ADM40±3T
ADM40±3F
ADM40±3H
Gain Accuracy, dAV
VSENSE = 10 mV to 150 mV, VCC = 12 V, VRS+ = 12 V,
TA = +25°C (ADM40±3T/F)
±2.0
%
%
%
VSENSE = 10 mV to 150 mV, VCC = 12 V, VRS+ = 12 V,
TA = −40°C to +125°C (ADM40±3T/F)
VSENSE = 10 mV to 100 mV, VCC = 12 V, VRS+ = 12 V,
TA = +25°C (ADM40±3H)
VSENSE = 10 mV to 100 mV, VCC = 12 V, VRS+ = 12 V,
TA = −40°C to +125°C (ADM40±3H)
±1.0 ±1.5
±3.0
OUT SettlingTime to 1% of Final Value
400
800
12
±8
85
90
5
ns
ns
kΩ
dB
dB
dB
μs
μs
VSENSE = 6.25 mV to 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF
VSENSE = 100 mV to 6.25 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF
Output Resistance, ROUT
Power Supply Rejection Ratio, PSRR
VSENSE = 60 mV, VCC = 3 V to 28 V (ADM40±3T)
VSENSE = 24 mV, VCC = 3 V to 28 V (ADM40±3F)
VSENSE = 12 mV, VCC = 3 V to 28 V (ADM40±3H)
CLOAD = 5 pF, VSENSE = 100 mV
Power-Up Time4
Saturation Recovery Time5
5
CLOAD = 5 pF, VCC = 12 V, VRS+ = 12 V
1 100% production tested at TA = 25°C. Specifications over temperature limit are guaranteed by design.
2 Total out voltage error is the sum of the gain and offset errors.
3 6.25 mV = 1/16th of 100 mV full-scale sense voltage.
4 Output settles to within 1% of final value.
5 The device does not experience phase reversal when overdriven.
Rev. 0 | Page 3 of 12
ADM4073
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
VCC to GND
RS± to GND
OUT to GND
OUT Short-Circuit to GND
Differential Input Voltage (VRS+ − VRS−
Current into any Pin
Storage Temperature Range
Operating Temperature Range
−0.3 V to +30 V
−0.3 V to +30 V
−0.3 V to (VCC + 0.3 V)
Continuous
±5 V
)
±20 mA
−65°C to +125°C
−40°C to +125°C
300°C
THERMAL CHARACTERISTICS
Lead Temperature, Soldering (10 sec)
Junction Temperature
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
150°C
Table 3. Thermal Resistance
Package Type
θJA
Unit
6-Lead SOT-23
169.5
°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 4 of 12
ADM4073
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM4073xWRJ
GND
1
2
3
6
5
4
OUT
RS–
RS+
TOP VIEW
(Not to Scale)
GND
V
CC
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1, 2
3
GND
VCC
Chip Ground Pin.
Chip Power Supply. Requires a 0.1μF capacitor to ground.
4
RS+
Power-Side Connection to the External Sense Resistor.
5
RS−
Load-Side Connection to the External Sense Resistor.
6
OUT
Voltage Output. VOUT is proportional to VSENSE. Output impedence is approximately 12 kΩ.
Rev. 0 | Page 5 of 12
ADM4073
TYPICAL PERFORMANCE CHARACTERISTICS
0.60
0.45
0.43
0.41
0.39
0.37
0.35
V
= 6.25mV
V
= 6.25mV
SENSE
SENSE
0.55
0.50
0.45
0.40
0.35
0.30
ADM4073H
ADM4073H
ADM4073T
ADM4073F
ADM4073F
ADM4073T
0
5
10
15
20
25
30
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
V
(V)
RS+
Figure 4. Supply Current vs. Supply Voltage (VSENSE = 6.25mV)
Figure 7. Supply Current vs. RS+ Voltage (VSENSE = 6.25 mV)
1.5
V
= 100mV
SENSE
V
= 100mV
SENSE
1.5
1.3
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
ADM4073H
ADM4073H
ADM4073F
1.1
0.9
0.7
0.5
ADM4073F
ADM4073T
25
ADM4073T
20
0
5
10
15
20
30
0
5
10
15
25
30
V
(V)
RS+
SUPPLY VOLTAGE (V)
Figure 8. Supply Current vs. RS+ Voltage (VSENSE = 100 mV)
Figure 5. Supply Current vs. Supply Voltage (VSENSE = 100 mV)
0.7
1.0
0.8
V
V
= 0mV
V
= 100mV
SENSE
= 28V
SENSE
CC
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
ADM4073F
ADM4073H
0.4
ADM4073T
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–50
–25
0
25
50
75
100
125
150
0
5
10
15
20
25
30
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Figure 6. Supply Current vs. Temperature
Figure 9. Total Output Error vs. Supply Voltage (VSENSE = 100 mV)
Rev. 0 | Page 6 of 12
ADM4073
1.0
0.8
2.0
1.5
V
= 6.25mV
SENSE
0.6
1.0
0.4
ADM4073F
ADM4073T
0.5
0.2
0
0
–0.2
–0.4
–0.6
–0.8
–1.0
–0.5
–1.0
–1.5
–2.0
ADM4073H
15
0
5
10
20
25
30
–50
–25
0
25
50
75
100
125
150
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Figure 10. Total Output Error vs. Supply Voltage (VSENSE = 6.25 mV)
Figure 13. Gain Accuracy vs. Temperature
1.0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
ADM4073F
0.5
ADM4073H
ADM4073H
0
ADM4073T
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
ADM4073F
ADM4073T
0
5
10
15
20
25
30
–50
0
50
100
150
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
Figure 11. Total Output Error vs. Common-Mode Voltage
Figure 14. O/P High Voltage (VCC − VOH) vs. Temperature
70
60
50
40
30
20
10
0
0.10
ADM4073F
0.08
0.06
0.04
0.02
0
V
V
= 28V
= 12V
CC
CC
ADM4073T
ADM4073H
–0.02
–0.04
–0.06
–0.08
–0.10
0.1
1
10
100
1000
10000
–50
0
50
TEMPERATURE (°C)
100
150
FREQUENCY (kHz)
Figure 15. PSRR vs. Frequency
Figure 12. Total Output Error vs. Temperature
Rev. 0 | Page ± of 12
ADM4073
45
40
35
30
25
20
15
10
5
ADM4073H
ADM4073F
100mV
95mV
10V
V
SENSE
ADM4073T
2.5mV/DIV
OUT
9.5V
250mV/DIV
0
0.1
1µs/DIV
1
10
100
1000
10000
FREQUENCY (kHz)
Figure 19. ADM4073H Small Signal Transient Response
Figure 16. Small Signal Gain vs. Frequency
100mV
100mV
6.25mV
2V
V
V
SENSE
SENSE
95mV
2V
2.5mV/DIV
45mV/DIV
OUT
50mV/DIV
OUT
0.9V/DIV
1.9V
0.120V
1µs/DIV
1µs/DIV
Figure 17. ADM4073T Small Signal Transient Response
Figure 20. ADM4073T Large Signal Transient Response
100mV
95mV
5V
100mV
6.25mV
5V
V
V
SENSE
45mV/DIV
SENSE
2.5mV/DIV
OUT
125mV/DIV
OUT
2.35V/DIV
4.75V
0.3V
1µs/DIV
1µs/DIV
Figure 18. ADM4073F Small Signal Transient Response
Figure 21. ADM4073F Large Signal Transient Response
Rev. 0 | Page 8 of 12
ADM4073
V
= 0V TO 4V
CC
100mV
6.25mV
10V
4V
0V
2V
0V
V
V
CC
2V/DIV
SENSE
45mV/DIV
OUT
OUT
1V/DIV
0.6V
4.7V/DIV
1µs/DIV
1µs/DIV
Figure 22. ADM4073H Large Signal Transient Response
Figure 24. ADM4073T Start-Up Delay
V
= 3V
CC
250mV
50mV
V
SENSE
100mV/DIV
V
OH
OUT
600mV/DIV
1V
1µs/DIV
Figure 23. ADM4073T Overdrive Response
Rev. 0 | Page 9 of 12
ADM4073
THEORY OF OPERATION
The current from the source flows through RSENSE, which
generates a voltage drop, VSENSE, across the RS+ and RS−
terminals of the sense amplifier. The Input Stage Amplifier A1
regulates its inputs to be equal, thereby shunting a current
proportional to VSENSE/RG1 to the output current mirror. This
current is then multiplied by a gain factor b in the output stage
To measure lower currents accurately, as large a sense resistor
as possible should be used to utilize the higher end of the sense
voltage range. This reduces the effects of the offset voltage
errors in the internal amplifier.
When currents are very large, it is important to take the I2R
power losses across the sense resistor into account. If the sense
resistor’s rated power dissipation is not sufficient, its value can
drift, giving an inaccurate output voltage, or it could fail
altogether. This, in turn, causes the voltage across the RS+ and
RS− pins to exceed the absolute maximum ratings.
current mirror and flows through RGD to generate VOUT
Therefore, VOUT is related to VSENSE by the ratio of R G1 to RGD and
the current gain b.
.
V
OUT = AV × VSENSE
where:
If the monitored supply rail has a large amplitude high
frequency component, a sense resistor with low inductance
should be chosen.
AV = RGD/RG1 × b
where:
R
SENSE
INPUT
COPPER PCB TRACE
OUTPUT
AV = 20 V/V (for ADM4073T).
AV = 50 V/V (for ADM4073H).
AV = 100 V/V (for ADM4073F).
RS+
CC
RS–
I
3V TO 28V
0.1µF
LOAD
SENSE
V
R
V
2V TO 28V
OUT
OUT
RS–
RS+
RG1
ADM4073
I
V
RG1
AV
CC
3V TO 28V
0.1µF
GND
RG2
Figure 26. Using PCB Trace for Current Sensing
OUTPUT (OUT)
ADM4073
The output stage of the ADM4073 is a current source driving a
pull-down resistance. To ensure optimum accuracy, care must
be taken not to load this output externally. To minimize output
errors, ensure OUT is connected to a high impedance input
stage. If this is not possible, output buffering is recommended.
V
CURRENT
MIRROR
OUT
RGD = 12kΩ
I
RGD
GND
Figure 25. Functional Block Diagram
The percent error introduced by output loading is determined
with the following formula:
RSENSE
% Error =100
R
LOAD /ROUT _ INT + RSENSE
−1
The ADM4073 has the ability to sense a wide variety of
currents by selecting a particular sense resistor. Select a suitable
output voltage for full-scale current, for example, 10 V for 10 A.
Then select a gain model that gives the most efficient use of the
sense voltage range (150 mV max).
where:
R
R
LOAD is the external load applied to OUT.
OUT_INT is the internal output resistance (12 kΩ).
In the example above, using the ADM4073H (gain of 100) give
an output voltage of 10 V when the sense voltage is 100 mV.
Use the following equation to determine what value of sense
resistor gives 100 mV with 10 A flowing through it:
R
R
SENSE = 100 mV/10 A
SENSE = 10 mΩ
V
OUT = (ILOAD × RSENSE) × AV
Rev. 0 | Page 10 of 12
ADM4073
OUTLINE DIMENSIONS
2.90 BSC
6
1
5
2
4
3
2.80 BSC
1.60 BSC
PIN 1
INDICATOR
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
0.22
0.08
10°
4°
0°
0.60
0.45
0.30
0.50
0.30
0.15 MAX
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 27. 6-Lead Small Outline Transistor Package [SOT-23]
(RJ-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADM40±3TWRJZ-REEL±1
ADM40±3FWRJZ-REEL±1
ADM40±3HWRJZ-REEL±1
Gain
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
6-Lead SOT-23
Package Option
Branding
M2E
20
RJ-6
RJ-6
RJ-6
50
6-Lead SOT-23
M2C
100
6-Lead SOT-23
M2D
1 Z = Pb-free part.
Rev. 0 | Page 11 of 12
ADM4073
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05131-0-7/06(0)
Rev. 0 | Page 12 of 12
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