Diodes ZXCT1008 User Manual
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Description
The ZXCT1008 is a high side current sense monitor. Using this
device eliminates the need to disrupt the ground plane when
sensing a load current.
It takes a high side voltage developed across a current shunt
resistor and translates it into a proportional output current. A user
defined output resistor scales the output current into a ground-
referenced voltage.
The wide input voltage range of 20V down to as low as 2.5V make
it suitable for a range of applications. The ability to withstand high
voltage transients and reverse polarity connection makes this part
very suitable for automotive and other transient rich environment.
Features
Low cost, accurate high-side current sensing
-40 to +125℃ temperature range
Up to 500mV sense voltage
2.5V to 20V supply range
4A quiescent current
1% typical accuracy
SOT23
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q100 Standards for High Reliability
Applications
Automotive current measurement
DC motor and solenoid control
Over current monitor
Power management
HIGH-SIDE CURRENT MONITOR
Pin Assignments
SOT23
Package Suffix - F
3V
SE NSE-
SE NSE-
V
V
SE NSE+
SE NSE+
3V
2
2
(Top View)
(Top View)
Application Circuit
in
V
RSENSE
VSENSE+
ZXCT1008
IOUT
VSENSE-
Rlim
R
1
1
I
I
OUT
OUT
To load
Vout
ZXCT1008
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,
"Green" and lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
ZXCT1008
Document number: DS33441 Rev. 6 - 2
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ZXCT1008
Pin Descriptions
Pin Name Pin Function
V
SENSE+
V
SENSE-
I
OUT
Absolute Maximum Ratings (@T
Voltage on any pin (relative to I
Continous output current, I
Continuous sense voltage, V
Operating temperature, T
Storage temperature -55 to +125 °C
Package power dissipation
@ TA = +25°C (Derate to
zero @ +125°C)
Operation above the absolute maximum rating may cause device failure. Operation at the absolute
maximum ratings for extended periods may reduce device reliability.
Electrical Characteristics (@T
Symbol Parameter Conditions
VIN V
1
I
OUT
V
SENSE
I
SENSE-
ACC
Connection to supply voltage
Connection to load
Output current, proportional to measured current
= +25°C, unless otherwise specified.)
A
Description Rating Unit
-0.6 to 20
25 mA
-0.5 to +5 V
-40 to
+85
450
= 100, unless otherwise specified.)
OUT
range
CC
Output Current
†
Sense Voltage
V
SENSE -
Input Current
)
OUT
OUT
†
SENSE
A
SOT23
SM8 2 W
= +25°C, VIN = 5V, R
A
V
= 0V
SENSE
V
= 10mV
SENSE
V
= 100mV
SENSE
V
= 200mV
SENSE
V
= 500mV
SENSE
Accuracy
R
= 0.1
SENSE
V
= 200mV
SENSE
V
°C
mW
Limits
Min Typ Max
2.5
1
90
0.975
1.95
4.8
0
4
104
1.0
2.0
5.0
20 V
15
120
1.025
2.05
5.2
500 mV
100 nA
-2.5
2.5 %
Units
µA
µA
mA
mA
mA
GM
BW Bandwidth
Notes: 4. Includes input offset voltage contribution
†. V
V
= V
= I
‡ -20dBm=63mVPP into 50
ZXCT1008
Document number: DS33441 Rev. 6 - 2
Transconductance,
I
OUT/VSENSE
SENSE
SENSE
is defined as the differential voltage between V
SENSE
IN
LOAD
- V
x R
+
LOAD
- V
SENSE
= V
SENSE-
V
V
SENSE(DC)
SENSE(DC)
= 10mv, RF PIN = -40dBm
= 100mv, RF PIN = -20dBm‡
and V
SENSE+
SENSE-
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10000
‡
300
2
µA/V
kHz
MHz
.
January 2014
© Diodes Incorporated
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Typical Characteristics
ZXCT1008
ZXCT1008
Document number: DS33441 Rev. 6 - 2
3 of 8
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January 2014
© Diodes Incorporated
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