Diodes ZXCT1022 User Manual
ZXCT1022
NC
GND
V
OUT
V
SENSE
-
V
SENSE
+
Pinout - top view
Low offset high-side current monitor
Description
The ZXCT1022 is a precision high-side current
sense monitor. Using this type of device
eliminates the need to disrupt the ground
plane when sensing a load current.
The ZXCT1022 provides a fixed gain of 100 for
applications where minimal sense voltage is
required.
The very low offset voltage enables a typical
accuracy of 3% for sense voltages of only 10mV,
giving better tolerances for small sense
resistors necessary at higher currents.
The wide input voltage range of 20V down to as
low as 2.5V make it suitable for a range of
applications. With a minimum operating
current of just 25µA, combined with its SOT235 package make it suitable for portable battery
equipment too.
Features
• Accurate high-side current sensing
• Ground referred output
• 2.5V – 20V supply range
•25A quiescent current
• SOT23-5 package
Applications
• Battery chargers
• Smart battery packs
• DC motor control
• Over-current protection
• Power supply current measurement
• Level translating
Pinout information Typical application circuit
Ordering information
Order reference Package Device
ZXCT1022E5TA SOT23-5 1022 Active 7 3000 8
Issue 6 - March 2008 1 www.zetex.com
© Zetex Semiconductors plc 2008
Status Reel size
marking
(inches)
Quantity
per reel
Tape width
(mm)
Absolute maximum ratings
NOTES:
ZXCT1022
Voltage on V
Voltage on V
SENSE
(‡)
V
s+
(*) (†)
s-
(*)
pin
V
OUT
(*)(†)
pin
-0.6V to 20V
-0.6V to V
S+
-0.6V to +0.5V
Operating temperature -40 to 85°C
Storage temperature -55 to 150°C
Package power dissipation (T
= 25°C)
A
- SOT23-5 - 450mW
(*) with respect to GND pin
(†) voltage not to exceed 20V
(‡) V
SENSE
= VS+ - V
S-
Pinout information
Pin name Pin function
N/C Not internally connected
GND Ground
V
OUT
Voltage output referenced to GND. Intended to
drive high impedance loads
+0.5V
V
_ High impedance negative sense voltage input
S
V
S+
Supply and positive sense voltage input
Issue 6 - March 2008 2 www.zetex.com
© Zetex Semiconductors plc 2008
ZXCT1022
NOTES:
V
IN
2–()
100
-----------------------
Electrical characteristics test conditions T
= 25°C, VIN = 15V
amb
Symbol Parameter Conditions Limits Unit
Min. Typ. Max.
V
IN
V
OUT
R
OUT
(*)
T
C
I
Q
SENSE
(†)
V
I
SENSE
Acc Accuracy V
Gain V
BW Bandwidth V
VCC range 2.5 20 V
Output voltage V
V
V
V
= 0V 0 30 100 mV
SENSE
= 10mV 0.97 1.0 1.03 V
SENSE
= 30mV 2.91 3.0 3.09 V
SENSE
= 100mV 9.7 10.0 10.3 V
SENSE
Output resistance 10 15 20 k⍀
Output temperature
50 300 ppm
coefficient
Ground pin current V
Sense voltage VIN = 20V 0
Load pin current V
OUT
/ V
SENSE
V
V
= 0V 25 35 A
SENSE
= 0V 100 nA
SENSE
= 10mV -3 3 %
SENSE
= 10mV 97 100 103 V/V
SENSE
= 10mV 300 kHz
SENSE
= 100mV 2 MHz
SENSE
180
(‡)
mV
(*) TC limits are determined by characterization
SENSE
V
SENSE
= VIN - V
=
LOAD
is limited by operating voltage and is approximately:
SENSE
(†) V
(‡) For linear operation maximum V
Issue 6 - March 2008 3 www.zetex.com
© Zetex Semiconductors plc 2008
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