SE9014 Datasheet, PDF (1/11 Pages) Seaward Electronics Inc. – Standalon Linear Lithum Battery Charger

Description
Features
SE9014 is a complete constant-current &
constant voltage linear charger for single cell
lithium-ion and Lithium-Polymer batteries. Its
SOT-23 package and low external component count
make SE9014 ideally suited for portable
applications. Furthermore, the SE9014 is
specifically designed to work within USB power
specification. At the same time, SE9014 can also
be used in the standalone lithium-ion and
Lithium-polymer battery chargers.
No external sense resistor is needed, and no
blocking diode is required due to the internal
MOSFET architecture.
Thermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature. The charge voltage is fixed
at 4.2V, and the charge current can be programmed
externally with a single resistor. The SE9014
automatically terminates the charge cycle when the
charge current drops to 1/10^th the programmed
value after the final float voltage is reached.
When the input supply (wall adapter or USB
supply) is removed, the SE9014 automatically
enters a low current stage, dropping the battery
drain current to less than 2uA. The SE9014 can
be put into shutdown mode, reducing the supply
current to 20uA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a
status pin to indicate charge termination and the
presence of an input voltage. SE9014 is
intentionally designed to have slightly negative
Tempco. This provides extra protection to Lithium
battery during charging.
 Programmable Charge Current Up to 800mA.
 No MOSFET, Sense Resistor or Blocking Diode
Required.
 Constant-Current/Constant-Voltage Operation
with Thermal Protection to Maximize Charge Rate
without Risk of Overheating.
 Charges Single Cell Li-Ion Batteries Directly from
USB Port.
 Preset 4.2V Charge Voltage with ±1% Accuracy.
 20uA Supply Current in Shutdown.
 2.9V Trickle Charge Threshold
 Soft-Start Limits Inrush Current.
 Available in PSOP-8 (Exposed Pad) Packages.
 RoHS Compliant and 100% Lead (Pb)-Free
Application
 Electronic cigarette
Application Diagram
Pin Configuration
Revision 9/12/2014
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2014. • www.seawardinc.com.cn • Page 1