Diodes ZXCT1009 User Manual
Zxct1009, High-side current monitor, Description
ZXCT1009
HIGH-SIDE CURRENT MONITOR
ZXCT1009
Document number: DS33441 Rev. 12 - 2
1 of 8
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 4µA, 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
μA 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
OUT
V
IN
R
SENSE
To load
V
OUT
R
OUT
1
2
3
ZXCT1009
V
SENSE+
V
SENSE-
I
OUT