Issue 1- July 2005 1 www.zetex.com
© Zetex Semiconductors plc 2005
ZXCT1011
High-side low drift current monitor
Description
The ZXCT1011 is a high side current sense monitor. Using this type of device eliminates the need
to disrupt the ground plane when sensing a load current.
The ZXCT1011 takes the 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.
A current reference resistor, external to the IC, results in an improved temperature coefficient
compared to the ZXCT1009.
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 4uA, combined with its SOT23-5 package
make it suitable for portable battery equipment too.
Features
■ Accurate high-side current sensing
■ 2.5V to 20V supply range
■ 4 µA quiescent current
■ 1% typical accuracy
■ Package SOT23-5
■ Temperature range -40 to 125°C
Applications
■ Automotive current measurement
■ Battery management
■ DC motor and solenoid control
■ Over current monitor
■ Power management
Typical application circuit Pin connections
Ordering information
Vin
Load
V
R
sense
ZXCT1011
V
sense+
I
out
GND
V
sense-
R
shunt
120 Ω
5
4
2
3
Rout
N/C
I
out
R
shunt
V
sense+
V
sense-
Order code Pack Part
mark
Reel Size
inches (mm)
Tape width Quantity Per
reel
ZXCT1011E5TA SOT23-5 1011 7 (180) 8mm 3,000
