ADM4073WFWRJZ-RL7 [ADI]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6, ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN;
| 型号： | ADM4073WFWRJZ-RL7 |
| 厂家： | 
ADI |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6, ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN 光电二极管 |
| 文件： | 总12页 (文件大小：221K) |
| 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
LOAD
Low cost, compact, current-sense solution
3 available gain versions
20 V/V (ADM4073T)
50 V/V (ADM4073F)
100 V/V (ADM4073H)
Typical 1.0% full-scale accuracy
Supply current: 500 μA
Wide bandwidth: 1.8 MHz
R
V
SENSE
2V TO 28V
OUT
RS–
RG2
RS+
RG1
I
V
RG1
AV
CC
3V TO 28V
0.1µF
Operating supply: 3 V to 28 V
Wide common-mode range: 2 V to 28 V
Independent of supply voltage
Operating temperature range: −40°C to +125°C
Available in a 6-lead SOT-23 package
Pin-to-pin compatibility with the MAX4073
ADM4073
OUT
CURRENT
MIRROR
V
OUT
RGD = 12kΩ
I
RGD
GND
APPLICATIONS
Figure 1.
Cell phones
PDAs
Notebook computers
APPLICATION DIAGRAM
R
V
SENSE
2V TO 28V
OUT
Portable, battery-powered systems
Smart battery packs and chargers
Automotive
Power management systems
PA bias control
RS+
CC
RS–
3V TO 28V
0.1µF
V
OUT
ADC
ADM4073
General system-level, board-level current monitoring
Precision current sources
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. A
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
www.analog.com
Fax: 781.461.3113 ©2006–2008 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
10/08—Rev. 0 to Rev. A
Changes to Theory of Operation Section and Output (OUT)
Section.............................................................................................. 10
Changes to Ordering Guide .......................................................... 11
7/06—Revision 0: Initial Version
Rev. A | Page 2 of 12
ADM4073
SPECIFICATIONS
VRS+ = 2 V to 28 V, VSENSE = (VRS+ − VRS−) = 0 V, 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 Output 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
Output High Voltage (VCC − VOH)
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
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
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 The sum of the gain and offset errors is the total OUT voltage error.
3 6.25 mV = 1/16th of 100 mV full-scale sense voltage.
4 Output settles to within 1% of final value.
5 When overdriven, this device does not experience phase reversal.
Rev. A | Page 3 of 12
ADM4073
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
THERMAL CHARACTERISTICS
Rating
VCC to GND
RS+, 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
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
θJA
Unit
)
6-Lead SOT-23
169.5
°C/W
±20 mA
−65°C to +125°C
−40°C to +125°C
300°C
ESD CAUTION
Lead Temperature, Soldering (10 sec)
Junction Temperature
150°C
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.
Rev. A | Page 4 of 12
ADM4073
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
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
GND
GND
VCC
RS+
RS−
Description
1
2
3
4
5
6
Chip Ground Pin.
Chip Ground Pin.
Chip Power Supply. Requires a 0.1 μF capacitor to ground.
Power-Side Connection to the External Sense Resistor.
Load-Side Connection to the External Sense Resistor.
OUT
Voltage Output. VOUT is proportional to VSENSE. Output impedance is approximately 12 kΩ.
Rev. A | 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 = 6.25 mV)
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. A | 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. Output High Voltage (VCC − VOH) vs. Temperature
70
0.10
ADM4073F
0.08
0.06
60
V
V
= 28V
= 12V
CC
CC
50
40
0.04
0.02
0
ADM4073T
30
–0.02
–0.04
–0.06
–0.08
–0.10
20
ADM4073H
10
0
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. A | 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
45mV/DIV
SENSE
95mV
2V
2.5mV/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. A | 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. A | Page 9 of 12
ADM4073
THEORY OF OPERATION
The current from the source flows through RSENSE, which gen-
erates 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 of b in the output stage current mir-
ror and flows through RGD to generate VOUT. Therefore, VOUT is
related to VSENSE by the ratio of RG1 to RGD and the current gain
of b.
To measure lower currents accurately, use as large a sense
resistor as possible 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 alto-
gether. This, in turn, causes the voltage across the RS+ and RS−
pins to exceed the absolute maximum ratings.
V
OUT = AV × VSENSE
where:
AV = RGD/RG1 × b
If the monitored supply rail has a large amplitude high
frequency component, choose a sense resistor with low
inductance.
Av is equal to different voltages depending upon the model of
the device.
R
SENSE
INPUT
COPPER PCB TRACE
OUTPUT
•
•
•
20 V/V for ADM4073T.
50 V/V for ADM4073F.
100 V/V for ADM4073H.
RS+
CC
RS–
3V TO 28V
0.1µF
V
I
LOAD
OUT
R
V
SENSE
2V TO 28V
OUT
ADM4073
RS–
RS+
GND
I
V
RG1
CC
3V TO 28V
0.1µF
R
R
G2
G1
Figure 26. Using PCB Trace for Current Sensing
AV
OUTPUT (OUT)
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.
ADM4073
OUT
CURRENT
MIRROR
V
OUT
R
= 12kΩ
GD
I
RGD
The percent error introduced by output loading is determined
with the following formula:
GND
Figure 25. Functional Block Diagram
% Error =100
1− RLOAD
/
ROUT _ INT + RLOAD
RSENSE
where:
R
R
LOAD is the external load applied to OUT.
OUT_INT is the internal output resistance (12 kΩ).
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, such as 10 V for 10 A. Then, select
a gain model that gives the most efficient use of the sense volt-
age range (150 mV max).
In the example above, using the ADM4073H (gain of 100) gives
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. A | 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
ADM40±3WFWRJZ-RL±1, 2
Gain
Temperature Range
−40°C to +125°C
−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
RJ-6
50
6-Lead SOT-23
M2C
100
50
6-Lead SOT-23
M2D
6-Lead SOT-23
M2C
1 Z = RoHS Compliant Part.
2 Automotive Grade.
Rev. A | Page 11 of 12
ADM4073
NOTES
©2006–2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05131-0-10/08(A)
Rev. A | Page 12 of 12
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