SE9020_10 Datasheet, PDF (4/9 Pages) Seaward Electronics Inc. – Standalone Linear Lithium Battery Charger

Pin Functions
Pin Pin Function Description
Pin
Pin Function Description
P Positive Input Supply Voltage. Provides
power to the charger. Vin can range
Vin from 4.75V to 6V and should be
bypassed with at least one 1μF
capacitor.
GND
Ground.
BAT-
LED1
Charge Current Output. Provides charge current to the battery and
regulates the final charge voltage to 4.22V. SE9020C/D will
automatically identify the polarity so this pin can be connected to BAT+
also.
LED1 is ON when the Lithium battery is successfully connected to the
IC.
BAT+
Charge Current Output. Provides
charge current to the battery and
regulates the final charge voltage to
4.22V. SE9020C/D will automatically
identify the polarity so this pin can be
connected to BAT- also.
LED2
With SOT-23-6L package. LED2 supports 2 options to indicate the
Charging and/or Full of the battery. With SE9020D, the LED2 will flash
at 5Hz frequency during charging. When the battery is full, LED2 will
output a constant voltage and the flashing will stop. With SE9020C,
LED2 can drive a standard 7-color IC-LED.
With DIP-8 package LED2 can only drive a standard 7-color IC-LED.
With DIP-8 package the LED3 will flash
at 5Hz frequency during charging.
LED3 When the battery is full, LED3 will
NC
With DIP-8 package NC is the unused PIN
output a constant voltage and the
flashing will stop
Typical Operating Characteristics
Revision 11/2/2010
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 4