ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
Description
The ZXCT1080 is a high side current sense monitor with a
gain of 10 and a voltage output. Using this device eliminates
the need to disrupt the ground plane when sensing a load
current.
The wide input voltage range of 60V down to as low as 3V
make it suitable for a range of applications; including systems
operating from industrial 24 to 28V rails and 48V rails.
The separate supply pin (V
CC
) allows the device to continue
functioning under short circuit conditions, giving an end stop
voltage at the output.
The
ZXCT1080
has
an
extended
ambient
operating
temperature range of -40°C to 125°C enabling it to be used in
a wide range of applications including automotive.
Pin Assignments
V
CC
1
5 S-
GND 2
OUT 3
7
S+
4
Features
•
•
•
•
•
•
•
3V to 60V continuous high side voltage
Accurate high-side current sensing
-40 to 125°C temperature range
AEC-Q100 Grade 1 qualified
Output voltage scaling x10
4.5V to 12V V
CC
range
Low quiescent current:
o
o
•
80μA supply pin
27μA I
S+
Applications
•
•
•
•
•
Industrial applications current measurement
Battery management
Over-current measurement
Power management
Automotive current measurement
SOT25 package
Typical Application Circuit
V
IN
4
V
CC
S+
R
SENSE
5
S-
1
ZXCT1080
GND
OUT
2
3
V
OUT
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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December 2011
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ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
Pin Descriptions
Pin
1
2
3
4
Name
V
CC
GND
OUT
S+
Description
This is the analogue supply and provides power to internal circuitry
Ground pin
Output voltage pin. NMOS source follower with 20μA bias to ground
This is the positive input of the current monitor and has an input range from
60V down to 3V. The current through this pin varies with differential sense
voltage
This is the negative input of the current monitor and has an input range
from 60V down to 3V
5
S-
Absolute Maximum Ratings
(T
A
= 25°C)
Parameter
Continuous voltage on S- and S+
Voltage on all other pins
Differential sense voltage, V
SENSE
(Note 1)
Operating temperature
Storage Temperature
Maximum Junction Temperature
Package Power Dissipation (Note 2)
Rating
-0.6 and 65
-0.6 and +14
800
-40 to +125
-55 to +150
125
300
(@ T
A
= 25°C)
Unit
V
V
mV
°C
°C
°C
mW
Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings,
for extended periods, may reduce device reliabilty.
Note:
1. V
SENSE
is defined as the differentail voltage between S+ and S- pins
2. Assumes
θ
JA
= 420°C/W
Recommended Operating Conditions
Symbol
V
IN
V
CC
V
SENSE
V
OUT
T
A
Note:
Parameter
Common-mode Sense+ Input Range
Supply Voltage Range
Differential Sense Input Voltage Range
Ouput Voltage Range (Note 3)
Ambient Temperature Range
Min
3
4.5
0
0
-40
Max
60
12
0.15
1.5
125
Units
V
V
V
V
°C
3. Based on 10x V
SENSE
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
Electrical Characteristics
T
A
= 25°C, V
IN
= 12V, V
CC
= 5V, V
SENSE
(Note 4
) = 100mV (unless otherwise specified)
Symbol
I
CC
I
S+
I
S-
V
O(0)
V
O(10)
Gain
V
OUT
TC
(Note 8
)
A
CC
I
OH
I
OL
PSRR
CMRR
BW
Notes:
Parameter
V
CC
Supply Current
S+ Input Current
S- Input Current
Zero V
SENSE
error
(Note 4, 6
)
Output Offset Voltage
(Note 7
)
ΔV
OUT
/ΔV
SENSE
(Note 4)
V
OUT
variation with
temperature
Total output error
Output Source Current
Output Sink Current
V
CC
Supply Rejection
Ration
Common-Mode Sense
Rejection Ratio
-3dB small signal
bandwidth
Conditions
V
CC
= 12V,
V
SENSE
=0V
(Note 4
)
T
A
25°C
Full range
25°C
Full range
Min
(Note 5)
40
15
15
0
-25
-55
9.9
9.8
Typ.
80
27
40
Max
Units
(Note 5)
120
145
42
60
80
35
+25
µA
µA
nA
mV
mV
V/V
ppm/°C
3
%
mA
µA
dB
dB
kHz
V
SENSE
= 0V
(Note 4
)
25°C
25°C
V
SENSE
= 10mV
(Note 4
)
V
SENSE
= 10mV to 150mV
(Note 4
)
25°C
Full range
25°C
Full range
10
+55
10.1
10.2
30
-3
ΔV
OUT
= -30mV
ΔV
OUT
= +30mV
V
CC
= 4.5V to 12V
V
IN
= 60V to 3V
V
SENSE (AC)
= 10mVpp
(Note 4
)
54
68
1
20
60
80
500
4. V
SENSE
= "V
S+
" - "V
S-
"
5. All Min and Max specifications over full temperature range are guaranteed by design and characterization
6. The ZXCT1080 operates from a positive power rail and the internal voltage-current converter current flow is unidirectional; these result in the output
offset voltage for V
SENSE
= 0V always being positive.
7. For V
SENSE
> 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used. V
O(10)
is expressed
as the variance about an output voltage of 100mV>
8. Temperature dependent measurements are extracted from characterization and simulation results.
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
Typical Characteristics
Test conditions unless otherwise stated:T
A
= 25°C, V
IN
= 12V, V
CC
= 5V, V
SENSE+
= 12V, V
SENSE
= 100mV
70
T
A
= 125°C
20
I
S+
INPUT CURRENT (µA)
I
CC
, SUPPLY CURRENT (µA)
65
T
A
= 85°C
15
T
A
= 25°C
T
A
= 125°C
60
T
A
= 25°C
T
A
= 0°C
55
T
A
= -40°C
V
S+
= 12V
V
SENSE
= 0mV
10
T
A
= -40°C
V
CC
= 5V
V
SENSE
= 0mV
50
2
4
6
8
10
V
CC
, SUPPLY VOLTAGE (V)
Fig. 1 Supply Current
12
5
0
5
10 15
20 25
30 35
V
S+
, INPUT CURRENT (V)
Fig. 2 Input Current
40
40
20
I
S+
INPUT CURRENT (µA)
35
I
S-
SENSE CURRENT (nA)
30
25
20
15
10
5
V
CC
= 5V
V
SENSE
= 0mV
T
AMB
= 25°C
15
10
5
-50
-25
0
25
50
75 100
T
A
, TEMPERATURE(°C)
Fig. 3 Input Current
125
0
0
5
10 15
20 25
30
V
S+
, INPUT VOLTAGE (V)
Fig. 4 Sense Current
35
40
1.6
1.4
V
OUT
, OUTPUT VOLTAGE (V)
V
OUT
, OUTPUT VOLTAGE (V)
1.8
V
SENSE
= 150mV
1.6
1.4
1.2
V
SENSE
= 100mV
V
CC
= 5V
V
S+
= 12V
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14
V
SENSE
,SENSE VOLTAGE (V)
Fig. 5 Output Voltage
1.0
0.8
0.6
0.4
0.2
0.0
-50
V
SENSE
= 10mV
V
SENSE
= 50mV
-25
0
25
50 75
100
T
A
, TEMPERATURE (°C)
Fig. 6 Output Voltage
125
ZXCT1080
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ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
Typical Characteristics
(cont.)
Test conditions unless otherwise stated:T
A
= 25°C, V
IN
= 12V, V
CC
= 5V, V
SENSE+
= 12V, V
SENSE
= 100mV
30
ΔV
OUT
, OUTPUT VOLTAGE (mV)
25
20
15
V
IN
= 12V
V
CC
= 5V
V
SENSE
= 100mV
T
A
= 125°C
T
A
= 85°C
T
A
= 25°C
T
A
= 0°C
T
A
= -40°C
0
-1
ΔOUTPUT
VOLTAGE (mV)
-2
-3
-4
-5
-6
-7
0.0
V
IN
= 12V
V
CC
= 5V
V
SENSE
= 100mV
T
A
= -40°C
T
A
= 0°C
T
A
= 25°C
10
5
T
A
= 85°C
T
A
= 125°C
0
0
10
15
20
25
30
I
OL
, OUTPUT SINK CURRENT (µA)
Fig. 7 Output Current Sink
5
0.2 0.4
0.6
0.8 1.0
1.2 1.4
I
OH
, OUTPUT SOURCE CURRENT (mA)
Fig. 8 Output Current Source
10.1
12m
V
SENSE
= 150mV
V
SENSE
= 100mV
V
SENSE
= 50mV
V
SENSE
= 10mV
ΔOUTPUT
VOLTAGE (V)
10.0
10m
8m
6m
4m
2m
0
GAIN
9.9
9.8
V
CC
= 5V
T
AMB
= 25°C
9.7
0
50m
100m
V
SENSE
, SENSE VOLTAGE (V)
Fig. 9 Differential gain
150m
0
5
10
15 20 25
30
V
S+
, INPUT VOLTAGE (V)
Fig. 10 Output Voltage
35
40
6m
ΔOUTPUT
VOLTAGE (V)
4m
2m
0
-2m
-4m
0
5
10
15 20 25 30
V
S+
, INPUT VOLTAGE (V)
Fig. 11 Output Voltage
35
40
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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December 2011
© Diodes Incorporated
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