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SE9017 Datasheet(PDF) 1 Page - Seaward Electronics Inc.

Part # SE9017
Description  Standalone Linear Lithium Battery Charger
Download  11 Pages
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Manufacturer  SEAWARD [Seaward Electronics Inc.]
Direct Link  http://www.seawardinc.com
Logo SEAWARD - Seaward Electronics Inc.

SE9017 Datasheet(HTML) 1 Page - Seaward Electronics Inc.

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Revision 4/16/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 1
Description
SE9017 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
SE9017
ideally
suited
for
portable
applications.
Furthermore,
the
SE9017
is
specifically designed to work within USB power
specification. At the same time, SE9017 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 SE9017
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 SE9017 automatically
enters a low current stage, dropping the battery
drain current to less than 2uA. The SE9017 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.
SE9017
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 6-Lead SOT-23 and PSOP-8
(Exposed Pad) Packages.
RoHS Compliant and 100% Lead (Pb)-Free
Pin Configuration
Application
Cellular Telephones, PDA’s, MP3 Players.
Charging Docks and Cradles
Bluetooth Applications
Application Diagram


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