Low Cost, Voltage Output,
High-Side, Current-Sense Amplifier
ADM4073
FEATURES
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
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
FUNCTIONAL BLOCK DIAGRAM
I
LOAD
2V TO 28V
RS+
I
RG1
RG1
RG2
R
SENSE
RS–
V
OUT
3V TO 28V
0.1µF
V
CC
AV
ADM4073
CURRENT
MIRROR
I
RGD
GND
RGD = 12kΩ
05131-003
OUT
V
OUT
APPLICATIONS
Cell phones
PDAs
Notebook computers
Portable, battery-powered systems
Smart battery packs and chargers
Automotive
Power management systems
PA bias control
General system-level, board-level current monitoring
Precision current sources
Figure 1.
APPLICATION DIAGRAM
2V TO 28V
R
SENSE
V
OUT
RS+
3V TO 28V
0.1µF
V
CC
RS–
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. 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 registered trademarks are the 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.
05131-001
ADM4073
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
Application Diagram ........................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Characteristics .............................................................. 4
ESD Caution...................................................................................4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics ..............................................6
Theory of Operation ...................................................................... 10
R
SENSE
............................................................................................. 10
Output (OUT)............................................................................. 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
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
V
RS+
= 2 V to 28 V, V
SENSE
= (V
RS+
− V
RS−
) = 0 V, V
CC
= 3 V to 28 V, T
A
= −40°C to +125°C, unless otherwise noted. Typical values are at T
A
= 25°C.
1
Table 1.
Parameter
POWER SUPPLY
Operating Voltage Range, V
CC
Common-Mode Input Range, V
CMR
Common-Mode Input Rejection, CMR
Supply Current, I
CC
Leakage Current, I
RS+
/I
RS−
Input Bias Current, I
RS+
Input Bias Current, I
RS−
Full-Scale Sense Voltage, V
SENSE
Total Output Voltage Error
2
Min
3
2
90
0.5
0.05
20
40
150
±1
±1.0
±1.0
±7.5
1.0
0.8
0.8
0.8
1.8
1.7
1.6
600
20
50
100
±1.0
Typ
Max
28
28
1.2
2
60
120
Unit
V
V
dB
mA
μA
μA
μA
mV
%
%
%
%
%
%
mV
V
V
V
MHz
MHz
MHz
kHz
V/V
V/V
V/V
%
%
%
%
ns
ns
kΩ
dB
dB
dB
μs
μs
Conditions
Inferred from PSRR test
Inferred OUT voltage error test
V
SENSE
= 100 mV, V
CC
= 12 V
V
CC
= 28 V
V
CC
= 0 V, V
RS+
= 28 V, T
A
= 85°C
±5.0
±5.0
±5.0
±5.0
Extrapolated Input Offset Voltage, V
OS
Output High Voltage (V
CC
− V
OH
)
1.2
1.2
1.2
V
SENSE
= (V
RS+
− V
RS−
)
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS+
= 2 V
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS+
= 12 V, T
A
= +25°C
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS
= 12V, T
A
= −40°C to +125°C
V
SENSE
= 100 mV, V
CC
= 28 V, V
RS
= 28 V, T
A
= +25°C
V
SENSE
= 100 mV, V
CC
= 28 V, V
RS
= 28 V, T
A
= −40°C to +125°C
V
SENSE
= 6.25 mV,
3
V
CC
= 12 V, V
RS
= 12 V
V
CC
= V
RS+
= 12 V, V
SENSE
> 10 mV
V
CC
= 3 V, V
SENSE
= 150 mV (ADM4073T)
V
CC
= 7.5 V, V
SENSE
= 150 mV (ADM4073F)
V
CC
= 15 V, V
SENSE
= 150 mV (ADM4073H), T
A
= 25°C
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF (ADM4073T)
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF (ADM4073F)
V
SENSE
= 100 mV, V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF (ADM4073H)
V
SENSE
= 6.25 mV,
3
V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF (ADM4073T/F/H)
ADM4073T
ADM4073F
ADM4073H
V
SENSE
= 10 mV to 150 mV, V
CC
= 12 V, V
RS+
= 12 V,
T
A
= +25°C (ADM4073T/F)
V
SENSE
= 10 mV to 150 mV, V
CC
= 12 V, V
RS+
= 12 V,
T
A
= −40°C to +125°C (ADM4073T/F)
V
SENSE
= 10 mV to 100 mV, V
CC
= 12 V, V
RS+
= 12 V,
T
A
= +25°C (ADM4073H)
V
SENSE
= 10 mV to 100 mV, V
CC
= 12 V, V
RS+
= 12 V,
T
A
= −40°C to +125°C (ADM4073H)
V
SENSE
= 6.25 mV to 100 mV, V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF
V
SENSE
= 100 mV to 6.25 mV, V
CC
= 12 V, V
RS+
= 12 V, C
LOAD
= 5 pF
V
SENSE
= 60 mV, V
CC
= 3 V to 28 V (ADM4073T)
V
SENSE
= 24 mV, V
CC
= 3 V to 28 V (ADM4073F)
V
SENSE
= 12 mV, V
CC
= 3 V to 28 V (ADM4073H)
C
LOAD
= 5 pF, V
SENSE
= 100 mV
C
LOAD
= 5 pF, V
CC
= 12 V, V
RS+
= 12 V
DYNAMIC CHARACTERISTICS
Bandwidth, BW
Gain, A
V
Gain Accuracy
±2.0
±2.0
±1.0
±1.5
±3.0
OUT Settling Time to 1% of Final Value
Output Resistance, R
OUT
Power Supply Rejection Ratio, PSRR
Power-Up Time
4
Saturation Recovery Time
5
1
2
400
800
12
78
85
90
5
5
100% production tested at T
A
= 25°C. Specifications over temperature limit are guaranteed by design.
The sum of the gain and offset errors is the total OUT voltage error.
3
6.25 mV = 1/16
th
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
V
CC
to GND
RS+, RS− to GND
OUT to GND
OUT Short-Circuit to GND
Differential Input Voltage (V
RS+
− V
RS−
)
Current into Any Pin
Storage Temperature Range
Operating Temperature Range
Lead Temperature, Soldering (10 sec)
Junction Temperature
Rating
−0.3 V to +30 V
−0.3 V to +30 V
−0.3 V to (V
CC
+ 0.3 V)
Continuous
±5 V
±20 mA
−65°C to +125°C
−40°C to +125°C
300°C
150°C
THERMAL CHARACTERISTICS
θ
JA
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
6-Lead SOT-23
θ
JA
169.5
Unit
°C/W
ESD CAUTION
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
6
OUT
TOP VIEW
GND
2
(Not to Scale)
5
RS–
V
CC 3
4
RS+
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
Mnemonic
GND
GND
V
CC
RS+
RS−
OUT
Description
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.
Voltage Output. V
OUT
is proportional to V
SENSE
. Output impedance is approximately 12 kΩ.
Rev. A | Page 5 of 12
05131-002
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