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Deion：

SD8017 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 SD8017 ideally suited for portable applications. Furthermore, the SD8017 is specifically designed to work within USB power specification. At the same time, SD8017 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 static

at 4.2V, and the charge current can be programmed externally with a single resistor. The SD8017 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 SD8017 automatically enters a low current stage, dropping the battery  drain current to less than 2uA. The SD8017 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. SD8017 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 Directl 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 5-Lead SOT-23

(Exposed Pad) Packages.

? RoHS Compliant and Lead (Pb)-Free Application

? Cellular Telephones, PDA’s, MP3 Players.

? Charging Docks and Cradles

? Bluetooth Applications