Diodes ZXCT1021 User Manual
ZXCT1021
Low offset high-side current monitor
Description
The ZXCT1021 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 ZXCT1021 provides a fixed gain of 10 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,
Features
• Accurate high-side current sensing
• Output voltage scaling
• 2.5V – 20V supply range
•25A quiescent current
• 1% typical accuracy
• SOT23-5 package
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.
Applications
• Battery chargers
• Smart battery packs
• DC motor control
• Over current monitor
• Power management
• Level translating
• Programmable current source
Pinout information Typical application circuit
NC
GND
V
OUT
Pinout - top view
V
SENSE
V
SENSE
-
+
Ordering information
Order reference Package Device
marking
ZXCT1021E5TA SOT23-5 1021 Released 7 3000 8
Issue 9 - July 2007 1 www.zetex.com
© Zetex Semiconductors plc 2007
Status Reel size
(inches)
Quantity
per reel
Tape width
(mm)
Absolute maximum ratings
ZXCT1021
Voltage on any pin
-0.6V to 20V
with respect to END pin
V
SENSE
-0.6V to VIN +0.5V
Operating temperature -40 to 85°C
Storage temperature -55 to 150°C
Package power dissipation (T
amb
= 25°C)
SOT23-5 300mW
Pinout information
Pin name Pin function
N/C Not internally connected
GND Ground
V
OUT
V
SENSE
V
SENSE+
Voltage output referenced to GND. Intended to drive high impedance loads
High impedance negative sense voltage input
-
Supply and positive sense voltage input
Issue 9 - July 2007 2 www.zetex.com
© Zetex Semiconductors plc 2007
ZXCT1021
NOTES:
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
V
SENSE
I
LOAD
(†)
VCC range 2.5 20 V
Output voltage V
V
V
= 30mV 291 300 309 mV
SENSE
= 100mV 0.98 1.00 1.02 V
SENSE
= 150mV 1.47 1.50 1.53 V
SENSE
Output resistance 10 15 20 k⍀
Output voltage
50 300 ppm
temperature coefficient
Ground pin current V
Sense voltage VIN = 20V 0
V
SENSE-
load pin
V
= 0V 25 35 A
SENSE
= 0V 100 nA
SENSE
1.5
(‡)
input current
Acc Accuracy V
Gain V
OUT
/ V
SENSE
BW Bandwidth V
V
V
= 100mV -2 2 %
SENSE
= 100mV 9.8 10 10.2 V/V
SENSE
= 10mV 300 kHz
SENSE
= 100mV 2 MHz
SENSE
V
(*) TC limits are determined by characterization
SENSE
= VIN - V
LOAD
voltages due to clipping of output voltage.
IN
(†) V
(‡) This will be reduced at lower V
Issue 9 - July 2007 3 www.zetex.com
© Zetex Semiconductors plc 2007
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