Description
SE1052 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and CC
(constant current) modes. It also has built-in LED
drivers specifically designed for stand-alone Battery
Charging applications. SE1052 integrates three
voltage references, three operational amplifiers, and
two current sensing circuits together in the same IC.
The
1
st
voltage
reference,
together
with
one
operational amplifier, controls the output voltage.
The 2
nd
voltage reference, together with another
operational amplifier, senses and limits the amount of
the current on the low side, hence the overall current
at the output. The 3
rd
voltage reference and
operational amplifier senses when the charging
current drops to 10% of the programmed value.
During charging, SE1052 will turn on Red LED. When
the charging is completed, SE1052 will turn on Green
LED. The SE1052 is available in SOP8 and DIP8
package.
Features
Constant Voltage and Constant Current Control
Low Voltage Operation
Precision Internal Voltage References
Low External Component Count
Current Sink Output Stage
Easy Compensation
Low AC Mains Voltage Rejection
Rugged 1.5KV ESD withstand capability.
Internal 2 LED drivers
Available in SOP8 and DIP-8 Package.
RoHS Compliant and 100% Lead (Pb)-Free
Application
Adapters
Digital Camera Chargers.
Cellphone Chargers.
Other Battery Chargers
Ordering Information
Device
Package
SOP8 and
V
OUT
Fixed output voltages
1.21V
Pin Configuration
SOP8 T View
op
Green
Output
GND
Vctrl
1
2
3
4
8
7
6
5
Red
Ictrl
Vsense Output
Vcc
GND
Vctrl
3
4
6
5
Vsense
Vcc
2
7
Ictrl
Green
DIP8 Top View
1
8
Red
SE1052
DIP8
(Lead-free)
Pin Description
Name
Green
V
OUT
GND
V
CTRL
V
CC
V
SENSE
I
CTRL
Red
Pin#
1
2
3
4
5
6
7
8
Type
Driver
Current Sink Output
Power Supply
Analog Input
Power Supply
Analog Input
Analog Input
Driver
Function
Turning on Green LED when the charging is completed.
Output Pin. Sinking Current Only
Ground Line. 0V Reference For All Voltages
Input Pin of the Voltage Control Loop
Positive Power Supply Line
Input Pin of the Current Control Loop
Input Pin of the Current Control Loop
Turning on Red LED when the charging is in progress.
Revision 5/7/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 1
SEAWARD [ Seaward Electronics Inc. ]
