YB1880 Schematic ( PDF Datasheet ) - YOBON TECHNOLOGIES

Teilenummer YB1880
Beschreibung Standalone Linear Lithium Battery Charger

Gesamt 10 Seiten
YB1880 Datasheet, Funktion
Standalone Linear Lithium Battery Charger
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
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
„ 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%
„ 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
„ Cellular and Smart Phones
„ Microprocessors and DSP Core Supplies
„ Wireless and DSL Modems
„ MP3 Player
„ Digital Still and Video Cameras
„ Portable Instruments
YB1880 Rev.1.0

YB1880 Datasheet, Funktion
Function Block
Standalone Linear Lithium Battery Charger
The YB1880 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It
can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage
accuracy of ±1%. The YB1880 includes an internal P-channel power MOSFET and thermal regulation circuitry.
No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only
two external components. Furthermore, the YB1880 is capable of operating from a USB power source.
Normal Charge Cycle
A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold level and a 1%
program resistor is connected from the PROG pin to ground or when a battery is connected to the charger
output. If the BAT pin is less than 2.8V, the charger enters trickle charge mode. In this mode, the YB1880
supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for
full current charging. When the BAT pin voltage rises above 2.8V, the charger enters constant-current mode,
where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float
voltage (4.2V), the YB1880 enters constant-voltage mode and the charge current begins to decrease. When
the charge current drops to 1/10 of the programmed value, the charge cycle ends.
YB1880 Rev.1.0

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