Diodes ZXCT1080 User Manual
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 elim inates
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
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.
) allows the device to continue
CC
Features
Pin Assignments
1
V
CC
GND
2
3
Applications
ZXCT1080
5
S-
7
4
S+OUT
• 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
• Low quiescent current:
o 80μA supply pin
o 27μA I
• SOT25 package
CC
S+
range
Typical Application Circuit
• Industrial applications current measurement
• Battery management
• Over-current measurement
• Power management
• Automotive current measurement
V
IN
V
CC
1
R
SENSE
4
S+
S-
ZXCT1080
GND OUT
2
3
5
V
OUT
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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December 2011
© Diodes Incorporated
ZXCT1080
Pin Descriptions
Pin Name Description
V
1
2 GND Ground pin
3 OUT Output voltage pin. NMOS source follower with 20μA bias to ground
4 S+
5 S-
Absolute Maximum Ratings (T
Continuous voltage on S- and S+ -0.6 and 65 V
Voltage on all other pins
Differential sense voltage, V
Operating temperature -40 to +125 °C
Storage Temperature -55 to +150 °C
Maximum Junction Temperature 125 °C
Package Power Dissipation (Note 2)
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
2. Assumes θ
SENSE
Recommended Operating Conditions
Symbol Parameter Min Max Units
VIN
VCC
V
SENSE
V
OUT
TA
Note: 3. Based on 10x V
ZXCT1080
Document number: DS33454 Rev. 4 - 2
CC
Parameter Rating Unit
is defined as the differentail voltage between S+ and S- pins
JA
Common-mode Sense+ Input Range 3 60 V
Supply Voltage Range 4.5 12 V
Differential Sense Input Voltage Range 0 0.15 V
Ouput Voltage Range
Ambient Temperature Range -40 125 °C
This is the analogue supply and provides power to internal circuitry
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
= 25°C)
A
SENSE
= 420°C/W
SENSE
(Note 1)
(Note 3) 0 1.5 V
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
-0.6 and +14 V
800 mV
300
(@ TA = 25°C)
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December 2011
ZXCT1080
Electrical Characteristics
TA = 25°C, VIN = 12V, VCC = 5V, V
Symbol Parameter Conditions
ICC VCC Supply Current
IS+
IS-
V
O(0)
V
O(10)
Gain
V
OUT
(Note 8)
ACC
IOH
IOL
PSRR
CMRR
BW
Notes: 4. V
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
7. For V
as the variance about an output voltage of 100mV>
8. Temperature dependent measurements are extracted from characterization and simulation results.
S+ Input Current
S- Input Current 25°C 15 40 80 nA
Zero V
(Note 4, 6)
Output Offset Voltage
(Note 7)
ΔV
OUT
TC
variation with
V
OUT
SENSE
/ΔV
SENSE
error
(Note 4)
temperature
Total output error -3 3 %
Output Source Current
Output Sink Current
Supply Rejection
V
CC
Ration
Common-Mode Sense
Rejection Ratio
-3dB small signal
bandwidth
= "VS+" - "VS-"
SENSE
= 0V always being positive.
SENSE
> 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used. V
SENSE
(Note 4) = 100mV (unless otherwise specified)
SENSE
= 12V,
V
CC
V
SENSE
V
SENSE
V
SENSE
V
SENSE
(Note 4)
30 ppm/°C
ΔV
OUT
ΔV
OUT
= 4.5V to 12V
V
CC
= 60V to 3V
V
IN
V
SENSE (AC)
(Note 4)
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
=0V (Note 4)
= 0V (Note 4)
= 10mV (Note 4)
= 10mV to 150mV
= -30mV
= +30mV
= 10mVpp
TA
Min
(Note 5)
Typ.
25°C 40 80 120
Full range 145
25°C 15 27 42
Full range 60
25°C 0 35 mV
25°C -25 +25
Full range -55 +55
25°C 9.9 10 10.1
Full range 9.8 10.2
1 mA
20 µA
54 60 dB
68 80 dB
500 kHz
Max
(Note 5)
is expressed
O(10)
Units
µA
µA
mV
V/V
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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December 2011
© Diodes Incorporated
P
U
T
CUR
RENT
N
CUR
REN
T
OUT
PUT VO
TAG
OUT
PUT
OLT
G
Typical Characteristics
Test conditions unless otherwise stated:T
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
= 25°C, VIN = 12V, VCC = 5V, V
A
SENSE+
= 12V, V
ZXCT1080
= 100mV
SENSE
70
T = 125°C
A
65
T = 85°C
A
60
T = 25°C
A
T = 0°C
A
55
T = -40°C
CC
A
I , SUPPLY CURRENT (µA)
50
V = 12V
S+
V = 0mV
SENSE
2 4 6 8 10 12
V , SUPPLY VOL TAGE (V)
CC
Fig. 1 Supply Current
20
15
20
(µA)
15
T = 25°C
A
T = 125°C
A
T = -40°C
10
S+
I IN
5
A
V = 5V
CC
V = 0mV
SENSE
0 5 10 15 20 25 30 35 40
V , INPUT CURRENT (V)
S+
Fig. 2 In put C ur r ent
40
35
30
(nA)
25
20
SE
15
10
10
S+
I INPUT CURRENT (µA)
5
-50 -25 0 25 50 75 100 125
T , TEMPERATURE(°C)
A
Fig. 3 In put C ur r ent
1.6
1.4
1.2
E (V)
1.0
L
0.8
S-
I SE
5
0
0 5 10 15 20 25 30 35 40
V , INPUT VOLTAGE (V)
S+
V = 5V
CC
V = 0mV
SENSE
T = 25°C
AMB
Fig. 4 Sen s e Current
1.8
V = 150mV
SENSE
1.6
1.4
E (V)
1.2
A
V = 100mV
SENSE
1.0
V
V = 5V
CC
V = 12V
S+
0.8
0.6
0.4
OUT
V,
0.2
0.0
0.04
0.060.00 0.02 0.08 0.10 0.12 0.14
V ,SENSE VOLTAGE (V)
SENSE
Fig. 5 Output Voltage
ZXCT1080
Document number: DS33454 Rev. 4 - 2
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V = 50mV
SENSE
0.6
0.4
OUT
V,
V = 10mV
SENSE
0.2
0.0
-25
-50 0 10 075 1255025
T , TEMPERATURE (°C)
A
Fig. 6 Out put Voltage
December 2011
© Diodes Incorporated
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