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PDF ( 数据手册 , 数据表 ) YB1880

零件编号 YB1880
描述 Standalone Linear Lithium Battery Charger
制造商 YOBON TECHNOLOGIES
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YB1880 数据手册, 描述, 功能
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.
Typical Application Circuit
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
YB1880 Rev.1.0
www.yobon.com.tw
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YB1880 pdf, 数据表
YB1880
Standalone Linear Lithium Battery Charger
Thermal Limiting
An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to
rise above a preset value of approximately 120. This feature protects the YB1880 from excessive
temperature and allows the user to push the limits of the power handling capability of a given circuit board
without risk of damaging the YB1880. The charge current can be set according to typical (not worst-case)
ambient temperature with the assurance that the charger will automatically reduce the current in worst-case
conditions. Thin SOT power considerations are discussed further in the Applications Information section.
Under voltage Lockout (UVLO)
An internal under voltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode
until VCC rises above the under voltage lockout threshold. The UVLO circuit has a built-in hysteresis of
200mV. Furthermore, to protect against reverse current in the power MOSFET, the UVLO circuit keeps the
charger in shutdown mode if VCC falls to within 30mV of the battery voltage. If the UVLO comparator is
tripped, the charger will not come out of shutdown mode until VCC raises 100mV above the battery voltage.
YB1880 Rev.1.0
www.yobon.com.tw
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