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 1/10th 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
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