General Description
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.
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.
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).
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.
Applications
Cell Phones
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
PDAs
Power Management Systems
PA Bias Control
General System/Board-Level Current Monitoring
Precision Current Sources
Features
o Low-Cost, Compact, Current-Sense Solution
o Three Gain Versions Available
+20V/V (MAX4073T)
+50V/V (MAX4073F)
+100V/V (MAX4073H)
o ±1.0% Full-Scale Accuracy
o 500µA Supply Current
o Wide 1.8MHz Bandwidth
o +3V to +28V Operating Supply
o Wide +2V to +28V Common-Mode Range
Independent of Supply Voltage
o Automotive Temperature Range (-40
°
C to +125
°
C)
o Available in Space-Saving 5-Pin SC70 Package
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
________________________________________________________________ Maxim Integrated Products
1
MAX4073T/F/H
R
SENSE
+2V TO +28V
I
LOAD
V
SENSE
V
CC
OUT
GND
RS+
+3V TO +28V
RS-
LOAD/
BATTERY
A/D
CONVERTER
0.1
µF
Typical Operating Circuit
19-2048; Rev 0; 4/01
Ordering Information
Pin Configurations appear at end of data sheet.
PART
TEMP. RANGE
PIN-PACKAGE
GAIN (V/V)
TOP MARK
MAX4073TAXK-T
-40
°C to +125°C
5 SC70-5
20
ACM
MAX4073TAUT-T
-40
°C to +125°C
6 SOT23-6
20
AAUE
MAX4073FAXK-T
-40
°C to +125°C
5 SC70-5
50
ACN
MAX4073FAUT-T
-40
°C to +125°C
6 SOT23-6
50
AAUF
MAX4073HAXK-T
-40
°C to +125°C
5 SC70-5
100
ACO
MAX4073HAUT-T
-40
°C to +125°C
6 SOT23-6
100
AAUG
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.
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
RS+
= +2V to +28V, V
SENSE
= (V
RS+
- V
RS-
) = 0, V
CC
= +3V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 1)
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.
V
CC
to GND ............................................................-0.3V to +30V
RS+, RS- to GND....................................................-0.3V to +30V
OUT to GND ...............................................-0.3V to (V
CC
+ 0.3V)
Output Short-Circuit to GND ......................................Continuous
Differential Input Voltage (V
RS+
- V
RS-
) .................................±5V
Current Into Any Pin..........................................................±20mA
Continuous Power Dissipation (T
A
= +70
°C)
5-pin SC70 (derate 2.27mW/°C above +70°C) ............200mW
6-pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Voltage Range
V
CC
(Note 2)
3
28
V
Common-Mode Input Range
V
CMR
(Note 3)
2
28
V
Common-Mode Rejection
CMR
V
SENSE
= 100mV, V
CC
= 12V
90
dB
Supply Current
I
CC
V
CC
= 28V
0.5
1.2
mA
Leakage Current
I
RS+
/I
RS-
V
CC
= 0, V
RS+
= 28V
0.05
1
µA
I
RS+
20
60
Input Bias Current
I
RS-
40
120
µA
Full-Scale Sense Voltage
V
SENSE
V
SENSE
= (V
RS+
- V
RS-
)
150
mV
V
SENSE
= 100mV, V
CC
= 12V, V
RS+
= 2V
±1.0
V
SENSE
= 100mV, V
CC
= 12V,
V
RS+
= 12V, T
A
= +25
o
C
±1.0
±5.0
V
SENSE
= 100mV, V
CC
= 12V,
V
RS+
= 12V, T
A
= T
MIN
to T
MAX
±7.0
V
SENSE
= 100mV, V
CC
= 28V,
V
RS+
= 28V, T
A
= +25
o
C
±1.0
±5.0
V
SENSE
= 100mV, V
CC
= 28V,
V
RS+
= 28V, T
A
= T
MIN
to T
MAX
±8.5
Total OUT Voltage Error (Note 4)
V
SENSE
= 6.25mV (Note 5); V
CC
= 12V,
V
RS+
= 12V
±7.5
%
Extrapolated Input Offset Voltage
V
OS
V
CC
= V
RS+
= 12V, V
SENSE
> 10mV
1.0
mV
MAX4073T, V
CC
= 3V
MAX4073F, V
CC
= 7.5V
OUT High Voltage
(V
CC
- V
OH
)
V
SENSE
=
150mV
MAX4073H, V
CC
= 15V
0.8
1.2
V
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= +2V to +28V, V
SENSE
= (V
RS+
- V
RS-
) = 0, V
CC
= +3V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4073T,
V
SENSE
= 100mV
1.8
MAX4073F,
V
SENSE
= 100mV
1.7
MAX4073H,
V
SENSE
= 100mV
1.6
MHz
Bandwidth
BW
V
CC
= 12V,
V
RS+
= 12V,
C
LOAD
= 5pF
MAX4073T/F/H
V
SENSE
= 6.25mV (Note 5)
600
kHz
MAX4073T
20
MAX4073F
50
Gain
AV
MAX4073H
100
V/V
T
A
= +25
°C
±1.0
±4.5
V
CC
= 12V,
V
RS+
= 12V,
V
SENSE
= 10mV
to 150mV,
MAX4073T/F
T
A
= T
MIN
to T
MAX
±6.5
T
A
= +25
°C
±1.0
±4.5
Gain Accuracy
AV
V
CC
= 12V,
V
RS+
= 12V,
V
SENSE
= 10mV
to 100mV,
MAX4073H
T
A
= T
MIN
to T
MAX
±6.5
%
V
SENSE
= 6.25mV to
100mV
400
OUT Settling Time to 1% of Final
Value
V
CC
= 12V
V
RS+
= 12V
C
LOAD
= 5pF
V
SENSE
= 100mV to
6.25mV
800
ns
Output Resistance
R
OUT
12
k
V
SENSE
= 60mV, MAX4073T
70
78
V
SENSE
= 24mV, MAX4073F
70
85
Power-Supply Rejection Ratio
PSRR
V
C C
= 3V to 28V
V
SENSE
= 12mV, MAX4073H
70
90
dB
Power-Up Time (Note 6)
C
LOAD
= 5pF, V
SENSE
= 100mV
5
µs
Saturation Recovery Time
(Note 7)
V
CC
= 12V, V
RS+
= 12V,
C
LOAD
= 5pF
5
µs
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
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.
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
4
_______________________________________________________________________________________
0.43
0.46
0.45
0.44
0.47
0.48
0.49
0.50
0.51
0.52
0.53
0
10
5
15
20
25
30
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX4073 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
SENSE
= 6.25mV
MAX4073H
MAX4073F
MAX4073T
0.5
0.8
0.7
0.6
0.9
1.0
1.1
1.2
1.3
1.4
1.5
0
10
5
15
20
25
30
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX4073 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
SENSE
= 100mV
MAX4073H
MAX4073F
MAX4073T
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
-50
0
25
-25
50
75
100
125
SUPPLY CURRENT vs.
TEMPERATURE
MAX4073 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
SENSE
= 0
V
CC
= +28V
0.47
0.49
0.48
0.51
0.50
0.53
0.52
0.54
0
10
15
5
20
25
30
SUPPLY CURRENT vs.
V
RS+
VOLTAGE
MAX4073 toc04
V
RS+
(V)
SUPPLY CURRENT (mA)
V
SENSE
= 6.25mV
MAX4073H
MAX4073F
MAX4073T
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
0
10
5
15
20
25
30
TOTAL OUTPUT ERROR vs.
SUPPLY VOLTAGE
MAX
4073 toc07
SUPPLY VOLTAGE (V)
TOTAL OUTPUT ERROR (%)
V
SENSE
= 100mV
MAX4073F
MAX4073H
MAX4073T
0.60
0.90
0.80
0.70
1.00
1.10
1.20
1.30
1.40
1.50
1.60
0
10
5
15
20
25
30
SUPPLY CURRENT vs.
V
RS+
VOLTAGE
MAX4073 toc05
V
RS+
(V)
SUPPLY CURRENT (mA)
V
SENSE
= 100mV
MAX4073H
MAX4073F
MAX4073T
0
0.3
0.2
0.1
0.5
0.4
0.9
0.8
0.7
0.6
1.0
-50
-25
0
25
50
75
100
125
OUTPUT HIGH VOLTAGE
(V
CC
- V
OH
) vs. TEMPERATURE
MAX4073 toc06
TEMPERATURE (
°C)
V
CC
- V
OH
(V)
V
SENSE
= 150mV
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
0
10
5
15
20
25
30
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
MAX4073 toc08
SUPPLY VOLTAGE (V)
TOTAL OUTPUT ERROR (%)
V
SENSE
= 6.25mV
Typical Operating Characteristics
(V
CC
= +12V, V
RS+
= +12V, V
SENSE
= 100mV, C
L
= 5pF, T
A
= +25
°C, unless otherwise noted.)
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
0
10
5
15
20
25
30
TOTAL OUTPUT ERROR
vs. COMMON-MODE VOLTAGE
MAX4073 toc09
COMMON-MODE VOLTAGE (V)
TOTAL OUTPUT ERROR (%)
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
_______________________________________________________________________________________
5
-1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
0.8
0.6
1.0
-50
0
25
-25
50
75
100 125 150
TOTAL OUTPUT ERROR
vs. TEMPERATURE
MAX4073 toc10
TEMPERATURE (
°C)
TOTAL OUTPUT ERROR (%)
V
CC
= +12V
V
CC
= +28V
GAIN ACCURACY
vs. TEMPERATURE
MAX4073 toc11
-2.0
-1.5
-0.5
-1.0
1.0
1.5
0.5
0
2.0
GAIN ACCURACY (%)
-50
0
25
-25
50
75
100
125
TEMPERATURE (
°C)
V
SENSE
= (10mV - 100mV)
100
1000
5
10
15
20
25
35
30
40
45
0.1
1
10
SMALL-SIGNAL GAIN vs.
FREQUENCY
MAX4073 toc12
FREQUENCY (kHz)
GAIN (dB)
0
10,000
MAX4073H
MAX4073F
MAX4073T
Typical Operating Characteristics (continued)
(V
CC
= +12V, V
RS+
= +12V, V
SENSE
= 100mV, C
L
= 5pF, T
A
= +25
°C, unless otherwise noted.)
100
20
0.1
10
100
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
40
30
50
60
70
80
90
MAX4073 toc13
FREQUENCY (kHz)
PSRR (dB)
1
1000
MAX4073H
MAX4073F
MAX4073T
1
µs/div
MAX4073T SMALL-SIGNAL
TRANSIENT RESPONSE
V
SENSE
2.5mV/div
OUT
50mV/div
95mV
100mV
2V
1.9V
MAX4073 toc14
1
µs/div
MAX4073F SMALL-SIGNAL
TRANSIENT RESPONSE
V
SENSE
2.5mV/div
OUT
125mV/div
95mV
100mV
5V
4.75V
MAX4073 toc15
1
µs/div
MAX4073H SMALL-SIGNAL
TRANSIENT RESPONSE
V
SENSE
2.5mV/div
95mV
100mV
10V
9.5V
MAX4073 toc16
OUT
250mV/div
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