19-5889; Rev 0; 8/11
EVALUATION KIT AVAILABLE
MAX9643
60V High-Speed Precision Current-Sense Amplifier
General Description
The MAX9643 is a high-speed 60V precision unidirec-
tional current-sense amplifier ideal for a wide variety of
power-supply control applications. Its high signal band-
width allows its use within DC-DC switching converter
power-supply control loops with minimal phase delay.
The IC also features 50FV (max) precision input offset
voltage, allowing small sense resistors to be used in
applications where efficiency is important and when wide
dynamic-range current measurement is needed.
High DC CMRR and AC CMRR make it easy to use in
a wide variety of aggressive environments. The device
is available in fixed gains of 2.5V/V and 10V/V. It is also
available in a small, 8-pin TDFN (2mm x 3mm) package
and is rated over the -40NC to +125NC temperature range.
Benefits and Features
S
Supports High-Voltage Applications
Wide Input V
CM
= -1.5V to +60V
S
Delivers High-Speed Operation
15MHz Bandwidth
S
Increases System Accuracy
Precision V
OS
= 50µV (max)
S
-40NC to +125NC Specified Temperature Range
Applications
Industrial and Automotive Power Supplies
GSM Base Station Power Supply
High-Brightness LED Control
Automotive Engine Control
H-Bridge Motor Control
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX9643.related.
Typical Operating Circuit
RS+
CP1
RS-
CP2
V
EE
OUT
V
CC
GND
BOOST
POWER-SUPPLY
CONTROL
LOAD
MAX9643
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Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9643
60V High-Speed Precision Current-Sense Amplifier
ABSOLUTE MAXIMUM RATINGS
RS+ to GND, RS- to GND (Note 1) .......................-3.5V to +65V
RS+ to RS-..........................................................................
Q15V
V
CC
to GND...........................................................-0.3V to +40V
V
CC
> 4.5V
OUT to GND .....................................................-0.3V to +4.5V
V
EE
to GND ......................................................+0.3V to -4.5V
CP1 to GND ......................................................-0.3V to +4.5V
V
CC
≤
4.5V
OUT to GND ......................................... -0.3V to (V
CC
+ 0.3V)
V
EE
to GND ........................................ +0.3V to (-V
CC
+ 0.3V)
CP1 to GND .......................................... -0.3V to (V
CC
+ 0.3V)
CP2 to GND ............................................. (V
EE
- 0.3V) to +0.3V
Short-Circuit Duration ................................................Continuous
Continuous Input Current into Any Pin ............................
Q20mA
ESD on RS+, RS- .......................................................Q4kV HBM
ESD on All Other Pins ................................................Q2kV HBM
Maximum Power Dissipation
TDFN-EP (derate 16.7mW/NC at +70NC) ................1333.3mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Lead Temperature (10s, soldering) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1:
Voltages below -3.5V are allowed, as long as the input current is limited to 5mA by an external resistor.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
TDFN
Junction-to-Ambient Thermal Resistance (B
JA
) ......... 60NC/W
Junction-to-Case Thermal Resistance (B
JC
) .............. 11NC/W
Note 2:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V, V
RS+
= V
RS-
= 12V, T
A
= -40NC to +125NC, unless otherwise noted.) (Note 3)
PARAMETER
DC CHARACTERISTICS
Input Common-Mode Voltage
Range
V
CC
R
5V, guaranteed by CMRR test,
V
SENSE
P
100mV
V
CC
< 5V, guaranteed by CMRR test,
V
SENSE
P
100mV
T
A
= +25NC
-40NC < T
A
<+125NC
-1.5V
P
V
CM
P
60V, T
A
= +25NC
120
110
90
35
60
60
25
T
A
= +25NC
-40NC < T
A
< +125NC
V
CM
< 2V
V
CM
R
2V
MAX9643T
MAX9643U
100
400
300
mV
0.02
0.15
0.3
-1.5
3.5 -
V
CC
10
130
+60
V
60
50
400
FV
dB
dB
FA
FA
FA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
RS+
, V
RS-
Input Offset Voltage (Notes 4, 5)
Common-Mode Rejection Ratio
(Note 5)
CMRR vs. Frequency (Note 5)
Input Bias Current
Input Bias Current, V
CC
= 0V,
V
RS+
= V
RS-
= 60V
Input Offset Current (Note 6)
Maximum Sense Voltage Before
Input Saturation
V
OS
CMRR
-1.5V
P
V
CM
P
60V, -40NC
P
T
A
P
+125NC
AC CMRR f = 100kHz
I
RS+
, I
RS-
I
RS+
, I
RS
I
RS+
- I
RS-
T
A
= +25NC
-40NC < T
A
< +125NC
FS
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Maxim Integrated Products
2
MAX9643
60V High-Speed Precision Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS* (continued)
(V
CC
= 5V, V
RS+
= V
RS-
= 12V, T
A
= -40NC to +125NC, unless otherwise noted.) (Note 3)
PARAMETER
Voltage Gain (Note 4)
Voltage Gain Error (Note 4)
AC CHARACTERISTICS
Signal Bandwidth
Slew Rate
Delay from Output Saturation to V
OL
Delay from Input Saturation and
Delay from Output Saturation to V
OH
OUTPUT CHARACTERISTICS
Output Short-Circuit Current
Output-Voltage Low (MAX9643T)
(Note 5)
I
SC
I
OUT
= 100FA sink, T
A
= +25NC
I
OUT
= 100FA sink, -40NC < T
A
< +125NC
I
OUT
= 1mA sink, T
A
= +25NC
I
OUT
= 1mA sink, -40NC < T
A
< +125NC
I
OUT
= 100FA sink, T
A
= +25NC
I
OUT
= 100FA sink, -40NC < T
A
< +125NC
I
OUT
= 1mA sink, T
A
= +25NC
I
OUT
= 1mA sink, -40NC < T
A
< +125NC
I
OUT
= 1mA source, V
CC
< 4.5V
I
OUT
= 1mA source, V
CC
R
4.5V
R
LOAD
= Open, no sustained oscillation
Guaranteed by PSRR
V
CC
= 2.7V to 36V, V
SENSE
= 10mV,
T
A
= +25NC
-40NC < T
A
< +125NC
T
A
= +25NC
-40NC < T
A
< +125NC
DV
EE
= 500mV
4
2.7
107
100
1000
1400
1600
FA
mA
125
V
CC
- 1.3
3.2
30
36
2.3
3.39
0.2
0.6
0.5
0.6
1
1
10
10
3
3
10
10
V
pF
V
dB
mV
mV
mA
BW
SR
V
SENSE
= 25mV
DC
+ 2mV
P-P
, MAX9643T
V
SENSE
= 25mV
DC
+ 2mV
P-P
, MAX9643U
V
OUT
= 10mV to 110mV
V
SENSE
= 0 to 20mV
V
SENSE
= 10V to 10mV
15
10
12
100
1
MHz
V/Fs
ns
Fs
GE
SYMBOL
MAX9643T
MAX9643U
T
A
= +25NC
-40NC < T
A
< +125NC
CONDITIONS
MIN
TYP
2.5
10
0.06
0.5
0.6
MAX
UNITS
V/V
%
V
OL
Output-Voltage Low (MAX9643U)
(Note 5)
V
OL
Output-Voltage High (Note 7)
Capacitive Drive Capability
V
OH
CL
V
CC
PSRR
POWER-SUPPLY CHARACTERISTICS
Power Supply
Power-Supply Rejection Ratio
(Note 5)
Quiescent Supply Current
Charge-Pump Current
Note
Note
Note
Note
Note
3:
4:
5:
6:
7:
I
CC
I
EE
All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design and/or characterization.
Gain and offset voltage are calculated based on two point measurements: V
SENSE1
= 10mV and V
SENSE2
= 100mV.
V
OS
, V
OL
, CMRR, and PSRR are measured with the charge pump off.
Guaranteed by design and/or characterization.
The maximum V
SENSE
of the MAX9643T is 400mV. With the gain = 2.5V/V, the output swing high is not applicable to the
MAX9643T.
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Maxim Integrated Products
3
MAX9643
60V High-Speed Precision Current-Sense Amplifier
Typical Operating Characteristics
(V
CC
= 5V, V
RS+
= V
RS-
= 12V, T
A
= -40NC to +125NC, unless otherwise noted. All devices are 100% production tested at T
A
= +25NC.
Temperature limits are guaranteed by design and/or characterization.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9643 toc02
MAX9643 toc01
INPUT OFFSET VOLTAGE HISTOGRAM
40
35
30
OCCURRENCE (%)
25
20
15
10
5
0
-20 -15 -10 -5
0
5 10 15 20 25 30
INPUT OFFSET VOLTAGE (V)
SUPPLY CURRENT
vs. TEMPERATURE
1.4
1.3
SUPPLY CURRENT (mA)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
MAX9643 toc03
1.5
1.4
1.3
SUPPLY CURRENT (mA)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
10
20
SUPPLY VOLTAGE (V)
30
1.5
40
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
GAIN ERROR
vs. COMMON-MODE VOLTAGE
MAX9643 toc04
GAIN ERROR vs. TEMPERATURE
COMMON-MODE REJECTION RATIO (dB)
0.18
0.16
GAIN ERROR (%)
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
MAX9643 toc05
COMMON-MODE REJECTION RATIO
vs. FREQUENCY (V
CM_AC
= 100mV)
-20
-40
-60
-80
-100
-120
-140
MAX9643 toc06
0.20
0.18
0.16
GAIN ERROR (%)
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
-10
0
10
20
30
40
50
0.20
0
60
-50
-25
0
25
50
75
100
125
1
10
100
1000
10,000 100,000
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (kHz)
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Maxim Integrated Products
4
MAX9643
60V High-Speed Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
CC
= 5V, V
RS+
= V
RS-
= 12V, T
A
= -40NC to +125NC, unless otherwise noted. All devices are 100% production tested at T
A
= +25NC.
Temperature limits are guaranteed by design and/or characterization.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9643 toc07
SMALL SIGNAL vs. FREQUENCY
(MAX9643T)
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
1
10
100
1000
FREQUENCY (kHz)
MAX9643 toc08
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.95
0.90
SUPPLY CURRENT (mA)
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
MAX9643 toc09
0
POWER-SUPPLY REJECTION RATIO (dB)
-20
-40
-60
-80
-100
-120
-140
1
10
100
FREQUENCY (kHz)
1000
1.00
SMALL-SIGNAL GAIN (dB)
10,000
10,000 100,000
0
5
10
15
20
25
30
35
40
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX9643 toc10
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
MAX9643 toc11
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
MAX9643 toc12
800
780
760
SUPPLY CURRENT (µA)
740
720
700
680
660
640
620
600
-50
-25
0
25
50
75
100
4.0
3.9
OUTPUT-VOLTAGE HIGH (V)
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
600
500
400
300
200
100
0
125
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT SOURCE CURRENT (mA)
OUTPUT-VOLTAGE LOW (µV)
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT SINK CURRENT (mA)
TEMPERATURE (°C)
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Maxim Integrated Products
5
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