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ADM4073 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM4073
Beschreibung Current-Sense Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADM4073 Datasheet, Funktion
www.DataSheet4U.com
Low Cost, Voltage Output,
High-Side, Current-Sense Amplifier
ADM4073
FEATURES
Low cost, compact, current-sense solution
Three available gain versions
20 V/V (ADM4073T)
50 V/V (ADM4073F)
100 V/V (ADM4073H)
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
APPLICATIONS
Cell phones, PDAs
Notebook computers
Portable/battery-powered systems
Smart battery packs/chargers
Automotive
Power management systems
PA bias control
General system/board-level current monitoring
Precision current sources
FUNCTIONAL BLOCK DIAGRAM
2V TO 28V
ILOAD
RSENSE
RS+ RS–
VOUT
3V TO 28V VCC
0.1µF
RG1
IRG1
RG2
AV
ADM4073
CURRENT
MIRROR
IRGD
VOUT
RGD = 12k
GND
Figure 1.
APPLICATION DIAGRAM
2V TO 28V
RSENSE
VOUT
3V TO 28V
0.1µF
RS+ RS–
VCC
OUT
ADM4073
ADC
GND
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.
Figure 2.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 Analog Devices, Inc. All rights reserved.






ADM4073 Datasheet, Funktion
ADM4073
TYPICAL PERFORMANCE CHARACTERISTICS
0.60
VSENSE = 6.25mV
0.55
0.50
0.45
ADM4073H
ADM4073F
0.40
0.35
ADM4073T
0.30
0
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
Figure 4. Supply Current vs. Supply Voltage (VSENSE = 6.25mV)
1.5
VSENSE = 100mV
1.4
1.3 ADM4073H
1.2
1.1
1.0
0.9
ADM4073F
0.8
0.7
0.6 ADM4073T
0.5
0
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
Figure 5. Supply Current vs. Supply Voltage (VSENSE = 100 mV)
0.7
VSENSE = 0mV
0.6 VCC = 28V
0.5
0.4
0.3
0.2
0.1
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
Figure 6. Supply Current vs. Temperature
0.45
VSENSE = 6.25mV
0.43
0.41
0.39
0.37
ADM4073H
ADM4073T
ADM4073F
0.35
0
5 10 15 20 25 30
VRS+ (V)
Figure 7. Supply Current vs. RS+ Voltage (VSENSE = 6.25 mV)
1.5 VSENSE = 100mV
1.3
ADM4073H
1.1
0.9 ADM4073F
0.7
ADM4073T
0.5
0
5 10 15 20 25 30
VRS+ (V)
Figure 8. Supply Current vs. RS+ Voltage (VSENSE = 100 mV)
1.0
VSENSE = 100mV
0.8
0.6
0.4
ADM4073T
0.2
ADM4073F
0 ADM4073H
–0.2
–0.4
–0.6
–0.8
–1.0
0
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
Figure 9. Total Output Error vs. Supply Voltage (VSENSE = 100 mV)
Rev. 0 | Page 6 of 12

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ADM4073 pdf, datenblatt
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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