YB1880
Standalone Linear Lithium Battery Charger
Description
YB1880 is a complete constant-current &
constant voltage linear charger for single cell
lithium-ion batteries. Its SOT-23 package and low
external component count make YB1880 ideally
suited for portable applications. Furthermore, the
YB1880 is specifically designed to work within USB
power specification. At the same time, YB1880 can
also be used in the standalone lithium-ion battery
charger.
No external sense resistor is needed, and no
blocking diode is required due to the internal
MOSFET architecture. Thermal feedback regulates
the charger 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 YB1880
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 YB1880 automatically
enters a low current stage, dropping the battery
drain current to less than 2μA. The YB1880 can be
put into shutdown mode, reducing the supply
current to 20μA.
Other features include charge current monitor,
under-voltage lockout, automatic recharge and a
status pin to indicate charge termination and the
presence of an input voltage.
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
20μA Supply Current in Shutdown
2.9V Trickle Charge Threshold
Available Without Trickle Charge
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
Pb-free Package
Application
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
PDA
MP3 Player
Digital Still and Video Cameras
Portable Instruments
Typical Application Circuit
YB1880 Rev.1.0
www.yobon.com.tw
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YOBON [ YOBON TECHNOLOGIES,INC. ]
