19-5543; Rev 2; 1/11
TION KIT
EVALUA BLE
AVAILA
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
General Description
The MAX9611/MAX9612 are high-side current-sense
amplifiers with an integrated 12-bit ADC and a gain
block that can be configured either as an op amp or
comparator, making these devices ideal for a number of
industrial and automotive applications.
The high-side, current-sense amplifiers operate over a
wide 0V to 60V input common-mode voltage range. The
programmable full-scale voltage (440mV, 110mV, and
55mV) of these amplifiers offers wide dynamic range,
accurate current measurement, and application flexibility
in choosing sense resistor values. A choice of either an
internal op amp or a comparator is provided to the user.
The internal amplifier can be used to limit the inrush cur-
rent or to create a current source in a closed-loop sys-
tem. The comparator can be used to monitor fault events
for fast response.
An I
2
C controlled 12-bit, 500sps analog-to-digital con-
verter (ADC) can be used to read the voltage across the
sense resistor (V
SENSE
), the input common-mode voltage
(V
RSCM
), op-amp/comparator output (V
OUT
), op-amp/
comparator reference voltage (V
SET
), and internal die
temperature. The I
2
C bus is compatible with 1.8V and
3.3V logic, allowing modern microcontrollers to interface
to it.
The MAX9611 features a noninverting input-to-output
configuration while the MAX9612 features an inverting
input-to-output configuration.
The MAX9611/MAX9612 operate with a 2.7V to 5.5V
supply voltage range, are fully specified over the -40NC
to +125NC automotive temperature range, and are avail-
able in a 3mm x 5mm, 10-pin
FMAX
M
package.
Features
S
0V to +60V Input Common-Mode Voltage Range
S
2.7V to 5.5V Power-Supply Range, Compatible
with 1.8V and 3.3V Logic
S
5µA Software Shutdown Current
S
Integrated 12-Bit ADC
S
13µV Current-Sense ADC Resolution
S
500µV (max) Current-Sense ADC Input Offset
Voltage
S
0.5% (max) Current-Sense ADC Gain Error
S
I
2
C Bus with 16 Addresses
S
Small, 3mm x 5mm 10-Pin µMAX Package
S
-40NC to +125NC Operating Temperature Range
MAX9611/MAX9612
Ordering Information/
Selector Guide
PART
MAX9611AUB+
MAX9612AUB+
OUTPUT
Noninverting
Inverting
PIN-PACKAGE
10
FMAX
10
FMAX
Note:
All devices operate over the -40NC to +125NC tempera-
ture range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit
0V TO 60V
R
SENSE
Applications
Hybrid Automotive Power Supplies
Server Backplanes
Base-Station PA Control
Base-Station Feeder Cable Bias-T
Telecom Cards
Battery-Operated Equipment
0.1µF
V
IN
RS+
V
CC
RS-
A0
A1
LOAD
OUT
SET
MAX9611
MAX9612
SCL
SCL
µC
1.8V LOGIC
GND
SDA
SDA
F
MAX is a registered trademark of Maxim Integrated Products, Inc.
Functional Diagrams appear at end of data sheet.
_______________________________________________________________
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.
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
MAX9611/MAX9612
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND.............................................................-0.3V to +6V
RS+, RS-, OUT to GND .........................................-0.3V to +65V
Differential Input Voltage, RS+ - RS- .................................
Q65V
All Other Pins to GND .............................................-0.3V to +6V
OUT Short-Circuit to GND .........................................Continuous
Continuous Current into Any Pin .....................................
Q20mA
Continuous Power Dissipation (T
A
= +70NC)
10-Pin
FMAX
(derate 8.8mW/NC above +70NC)...........707mW
FMAX
Package Junction-to-Ambient
Thermal Resistance (B
JA
) (Note 1)............................113NC/W
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1:
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 consideration, refer to
www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, V
RS+
= V
RS-
= +12V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
Input Common-Mode Range
SYMBOL
CONDITIONS
Guaranteed by CMRR
T
A
= +25NC, gain = 8x
T
A
= -40NC to +125NC, gain = 8x
Input Offset Voltage ADC Path
(Note 3)
V
OS
T
A
= +25NC, gain = 4x
T
A
= -40NC to +125NC, gain = 4x
T
A
= +25NC, gain = 1x
T
A
= -40NC to +125NC, gain = 1x
T
A
= +25NC, gain = 8x
T
A
= -40NC to + 85NC, gain = 8x
T
A
= -40NC to +125NC, gain = 8x
Gain Error (Note 3)
GE
T
A
= +25NC, gain = 4x
T
A
= -40NC to +125NC, gain = 4x
T
A
= +25NC, gain = 1x
T
A
= -40NC to +125NC, gain = 1x
Differential Input Resistance
Common-Mode Input Resistance
Input Bias Current
Input Offset Current (Note 4)
R
INDM
R
INCM
I
RS+
, I
RS-
(I
RS+
) - (I
RS-)
T
A
= +25NC
T
A
= -40NC to +125NC
T
A
= +25NC
T
A
= -40NC to +125NC
3
300
12
1
2
5
6
6
1
0.4
0.1
0.1
0.045
MIN
0
0.045
TYP
MAX
60
0.5
2
0.5
2
0.8
2.6
0.5
1.8
2.5
1.7
3.1
4
4.7
kI
MI
FA
nA
%
mV
UNITS
V
CURRENT-SENSE AMPLIFIER DC CHARACTERISTICS
2
______________________________________________________________________________________
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
RS+
= V
RS-
= +12V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Gain = 8x,
V
SENSE
= 50mV
V
RS-
= 0V to 60V,
T
A
= +25NC
Gain = 4x,
V
SENSE
= 100mV
Gain = 1x,
V
SENSE
=400mV
Gain 8x,
V
SENSE
= 50mV
V
RS-
= 0V to 60V,
T
A
= -40NC to +125NC
Gain 4x,
V
SENSE
= 100mV
Gain 1x,
V
SENSE
= 400mV
Gain = 8x,
V
SENSE
= 50mV
Power-Supply Rejection Ratio
PSRR
V
CC
= 2.7V to 5.5V
Gain = 4x,
V
SENSE
= 100mV
Gain = 1x,
V
SENSE
= 400mV
Full-Scale Sense Volt
age
FS
Used in gain error
measurement
Gain = 8x
LSB Step Size
LSB
Gain = 4x
Gain = 1x
ANALOG PATH, CSA + AMPLIFIER/COMPARATOR
Input Offset Voltage
SET Input Bias Current
Maximum SET Input Voltage
Range
Signal Bandwidth
Gain Bandwidth
Propagation Delay
Internal Hysteresis
Output Sink Current
Output Leakage Current
Output Voltage Low
V
OL
BW
GBW
t
PD
V
HYS
In comparator mode, 10mV overdrive
In comparator mode, nonlatching
V
OUT
= 4V
V
OUT
= 36V
I
SINK
= 8mA, T
A
= -40°C to +85°C
I
SINK
= 8mA, T
A
= -40NC to +125NC
0.5
Gain = 1x, RS- = 11.6V
V
OS
I
B
T
A
= +25NC
T
A
= -40NC to +125NC
1
1.126
4
2.5
1.5
8
20
1.7
3
1
1.5
0.350
4
10
50
mV
nA
V
MHz
MHz
Fs
mV
mA
FA
V
Gain = 8x
Gain = 4x
Gain = 1x
MIN
106
106
100
94
94
84
57
56
48
72
67
57
55
110
440
13.44
26.88
107.50
FV
mV
dB
TYP
120
120
120
dB
MAX
UNITS
MAX9611/MAX9612
Common-Mode Rejection Ratio
CMRR
_______________________________________________________________________________________
3
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
MAX9611/MAX9612
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
RS+
= V
RS-
= +12V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
Full-Scale Input Voltage
LSB Step Size
Gain Error
Input Offset Voltage
SYMBOL
CONDITIONS
MIN
TYP
57.3
14
0.8
14
MAX
UNITS
V
mV
6
7
110
160
57.3
LSB
GE
V
OSOUT
V
RSCM
=
(V
RS+
- V
RS-
)/2
T
A
= +25NC
T
A
= -40NC to +125NC
1.10
268
GE
V
OSOUT
INL
DNL
V
RSCM
=
(V
RS+
- V
RS-
)/2
T
A
= +25NC
T
A
= -40NC to +125NC
1
0.2
0.48
-40
LSB
0.48
12
2
V
IL
V
IH
V
HYS
V
CC
= 2.7V to 5.5V
V
CC
= 2.7V to 5.5V
1.45
0.05 x
V
CC
1
1/4 x V
CC
1/2 x V
CC
3/4 x V
CC
1
200
0.4
+125
T
A
= +25NC
T
A
= -40NC to +125°C
0.3
0.2
5
6
10
14
T
A
= +25NC
T
A
= -40NC to +125°C
14
14
0.3
6
7
80
160
%
mV
OUT VOLTAGE MEASUREMENT (V
OUT
)
LSB
GE
V
OSOUT
V
RSCM
=
(V
RS+
- V
RS-
)/2
T
A
= +25NC
T
A
= -40NC to +125NC
T
A
= +25NC
T
A
= -40NC to +125°C
COMMON-MODE VOLTAGE MEASUREMENT (V
RSCM
)
Full-Scale Input Voltage
LSB Step Size
Gain Error
Input Offset Voltage
V
mV
%
mV
SET VOLTAGE MEASUREMENT (V
SET
)
Full-Scale Input Voltage
LSB Step Size
Gain Error
Input Offset Voltage
Integral Nonlinearity
Differential Nonlinearity
TEMPERATURE MEASUREMENT
Accuracy
Typical Measurement Range
LSB Step Size
ANALOG-TO-DIGITAL CONVERTER
Resolution
Conversion Time
SCL/SDA LOGIC LEVELS
Input Voltage Low
Input Voltage High
Input Hysteresis
Input Leakage Current
A1/A0 LOGIC LEVELS
Logic State 00-01 Threshold
Logic State 01-10 Threshold
Logic State 10-11 Threshold
Input Leakage Current
V
V
V
nA
V
V
V
200
nA
Bit
ms
NC
NC
NC
V
FV
%
mV
LSB
LSB
4
______________________________________________________________________________________
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
RS+
= V
RS-
= +12V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
Power-Supply Input Range
Quiescent Current
Shutdown Current
Serial-Clock Frequency
Bus Free Time Between a STOP
and a START Condition
Hold Time, (Repeated) START
Condition
SCL Clock Low Period
SCL Clock High Period
Setup Time for a Repeated
START Condition
Data Hold Time
Data Setup Time
SDA/SCL Receiving Rise Time
SDA/SCL Receiving Fall Time
SDA Transmitting Fall Time
STOP Condition Setup Time
Bus Capacitance
Pulse Width of Spike Suppressed
SYMBOL
V
CC
I
CC
I
SHDN
f
SCL
t
BUF
t
DH,STA
t
LOW
t
HIGH
t
SU,STA
t
DH,DAT
t
SU,DAT
t
R
t
F
t
F
t
SU,STO
C
B
t
SP
50
(Note 5)
(Note 5)
(Note 5)
No activity on SCL
0
1.3
0.6
1.3
0.6
0.6
0
100
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
0.6
400
300
300
250
Fs
pF
ns
ns
900
CONDITIONS
Guaranteed by PSRR
MIN
2.7
1.6
5
TYP
MAX
5.5
2.6
10
400
UNITS
V
mA
FA
kHz
Fs
Fs
Fs
Fs
Fs
Fs
ns
POWER-SUPPLY CHARACTERISTICS
MAX9611/MAX9612
I
2
C TIMING CHARACTERISTICS (COMPATIBLE WITH SMBus)
Note 2:
All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design.
Note 3:
V
OS
and gain error of current-sense amplifier extrapolated from from a two-point measurement made at V
SENSE
= (V
RS+
-
V
RS-
) = 5mV to 50mV in gain of 8x, 5mV to 100mV in gain of 4x, and 10mV to 400mV in gain of 1x.
Note 4:
Guaranteed by design.
Note 5:
C
B
is in pF.
I
2
C Timing Diagram
SDA
t
SU,DAT
t
HD,DAT
t
HIGH
t
SU,STA
t
BUF
t
HD,STA
t
SU,STO
t
LOW
SCL
t
HD,STA
t
R
t
F
REPEATED START CONDITION
STOP
CONDITION
START
CONDITION
START CONDITION
_______________________________________________________________________________________
5
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