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YOBON TECHNOLOGIES
YOBON TECHNOLOGIES


YB1880

Standalone Linear Lithium Battery Charger



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YB1880 pdf
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
1



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Pin Configuration
YB1880
Standalone Linear Lithium Battery Charger
Figure 2: Pin Configuration
Pin Description
Table 1
Pin Number
1
2
3
4
Pin Name
CHRG
GND
BAT
VCC
Description
Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is
pulled low by an internal N-channel MOSFET. When the charge cycle is completed,
a weak pull-down of approximately 20mA is connected to the CHRG pin, indicating
an “AC present” condition. When the YB1880 detects an under voltage lockout
condition, CHRG is forced high impedance.
Ground
Charge Current Output. Provides charge current to the battery and regulates the
final float voltage to 4.2V. An internal precision resistor divider from this pin sets the
float voltage which is disconnected in shutdown mode.
Positive Input Supply Voltage. Provides power to the charger. VCC can range from
4.25V to 6.5V and should be bypassed with at least a 1mF capacitor. When VCC
drops to within 30mV of the BAT pin voltage, the
YB1880 enters shutdown mode, dropping IBAT to less than 2mA.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge
current is programmed by connecting a 1% resistor, RPROG, to ground. When
charging in constant-current mode, this pin servos to 1V. In all modes, the voltage
on this pin can be used to measure the charge current using the following formula:
IBAT = (VPROG/RPROG) • 1000
5
PROG
The PROG pin can also be used to shut down the charger. Disconnecting the
program resistor from ground allows a 3mA current to pull the PROG pin high.
When it reaches the 1.21V shutdown threshold voltage, the charger enters
shutdown mode, charging stops and the input supply current drops to 25mA. This
pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the
clamp voltage will draw currents as high as 1.5mA. Reconnecting RPROG to
ground will return the charger to normal operation.
Ordering Information
Order Number Package Type
YB1880ST25P
SOT23-5
Supplied As
3000 units Tape & Reel
Package Marking
Please contact sales
representative
YB1880 Rev.1.0
www.yobon.com.tw
2



Part Number YB1880
Description Standalone Linear Lithium Battery Charger
Maker YOBON TECHNOLOGIES - YOBON TECHNOLOGIES
Total Page 10 Pages
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