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ZXCT1009
HIGH-SIDE CURRENT MONITOR
 
ZXCT1009  
Document number: DS33441 Rev. 12 - 2 
1 of 8
www.diodes.com
April 2011
?Diodes Incorporated 
Description 
The ZXCT1009 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. A minimum
operating current of just 4礎, combined with a SOT23
package make it a unique solution for portable battery
equipment. The SM8 device offers an alternative package
option.
 
Features 
"     Low cost, accurate high-side current sensing
"     Output voltage scaling
"     Up to 2.5V sense voltage
"     2.5V to 20V supply range
"     4糀 quiescent current
"     1% typical accuracy
"     SOT23 and SM8 packages
"     AEC-Q100.3 qualified; ZXCT1009FTA only
 
Applications 
"     Battery chargers
"     Smart battery packs
"     DC motor control
"     Over current monitor
"     Power management
"     Level translating
"     Programmable current source
"     
Pin Assignments 
SOT23
Package Suffix - F
 
 
 
 
 
 
 
 
 
SM8
Package Suffix  T8
 
 
 
 
 
 
 
 
 
 
Application Circuit 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
I
OUT
V
SENSE+
3
V
SENSE-
(Top View)
2
1
I
OUT
V
SENSE+
3
V
SENSE-
(Top View)
2
1
I
OUT
N/C
V
SENSE-
N/C
(Top View)
4
2
3
1
5
7
6
8
N/C
V
SENSE+
N/C
N/C
I
OUT
N/C
V
SENSE-
N/C
(Top View)
4
2
3
1
5
7
6
8
N/C
V
SENSE+
N/C
N/C
V
IN
R
SENSE
To load
V
OUT
R
OUT
1
2
3
ZXCT1009
V
SENSE+
V
SENSE-
I
OU T
V
IN
R
SENSE
To load
V
OUT
R
OUT
1
2
3
ZXCT1009
V
SENSE+
V
SENSE-
I
OU T
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