Description
SE9020C/D is a complete Limit-current &
constant voltage charger for single cell Lithium-ion
and Lithium-Polymer batteries. Its SOT-23-6L
package and low external component count make
SE9020C/D ideally suited for portable applications.
Furthermore, the SE9020C/D is specifically
designed to work within Universal Travel Charger.
SE9020C/D has a built-in detector that will
automatically detect the polarity of the inserted
battery and charge the battery at the correct the
polarity. The charge voltage is fixed at 4.2V. The
SE9020C/D automatically terminates the charge
cycle when the charge current drops to 14mA after
the final float voltage is reached.
When the input supply is removed, the
SE9020C/D automatically enters a low current
stage, dropping the battery drain current to less
than 7mA. The SE9020C/D can be put into
shutdown mode, reducing the supply current to
30uA.
SE9020C/D supports two LED drivers that
give the customers the option to select which
method fit best in their respective applications. One
LED driver is internally set to indicate the power
on/off of the IC. Another LED driver can either drive
a standard LED named SE9020D or 7-color LED
named SE9020C, which will be explained in detail
in the application notes.
Features
Automatically Identifies the polarity of the battery
Typical-Current to 250mA
Short-Circuit Protection
Low external component
Build in high precision reference voltage
Preset 4.2V Charge Voltage with ±1% Accuracy.
20uA Supply Current in Shutdown.
Support Standalone Battery Charger.
Support both 2-LED and Flashing LED
schemes.
Available in 6-Lead SOT-23-6L DIP-8 and COB
Packages.
RoHS Compliant and 100% Lead (Pb)-Free
Pin Configuration
Application
Universal Travel Charger
Pin Configuration
1
LED2
2
VIN
3
BAT-
4
GND
5
BAT+
6
LED3
7
LED1
COB
Revision 2/16/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 1
SEAWARD [ Seaward Electronics Inc. ]
