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

Description

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.

Features



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

Pin Configuration

Application



Electronic cigarette

Application Diagram