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Shanghai Belling - 800mA Standalone Linear Li-Ion Battery Charger

Numéro de référence BL4054
Description 800mA Standalone Linear Li-Ion Battery Charger
Fabricant Shanghai Belling 
Logo Shanghai Belling 





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BL4054 fiche technique
BL4054
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in Thin SOT
FEATURES
z Programmable Charge Current Up to
800mA
z No MOSFET, Sense Resistor or Blocking
Diode Required
z Preset 4.2V Charge Voltage with ±1%
Accuracy
z Charge Current Monitor Output for Gas
Gauging
z Thermal Regulation Maximizes Charge
Rate Without Risk of Overheating
z Charges Single Cell Li-Ion Batteries Dire-
ctly from USB Port
z Over-Voltage Protect
z Automatic Recharge
z Charge Status Output Pin
z C/10 Charge Termination
z 25μA Supply Current in Shutdown
z 2.9V Trickle Charge Threshold
z Soft-Start Limits Inrush Current
z Available in 5-Lead SOT-23 Package
APPLICATIONS
z Cellular and Smart Phones
z Charging Docks and Cradles
z Blue Tooth Applications
z PDAs
z MP3 Players
DESCRIPTION
The BL4054 is a complete constant-current /
constant voltage linear charger for single cell
Lithium-Ion batteries. No external sense
resistor is needed, and no blocking diode is
required due to the internal MOSFET archite-
cture. Thermal feedback regulates the charge
current to limit the die temperature during
high power operation or high ambient temper-
ature. The charge voltage is fixed at 4.2V,
and the charge current can be programmed
externally with a single resistor. The BL4054
automatically terminates the charge cycle
when the charge current drops to 1/10 the
programmed value after the final float voltage
is reached.
When the input supply (wall adapter or USB
supply) is removed, the BL4054 automatically
enters a low current state, dropping the
battery drain current to less than 2μΑ. The
BL4054 can be put into shutdown mode,
reducing the supply current to 25μA.
Other features include charge current monitor,
under-voltage lockout, automatic recharge
and a status pin to indicate charge termi-
nation and the presence of an input voltage.
ORDERING INFORMATION
BL4054 – XX X X XXX
Package:
TRN:TSOT23-5
RN:SOT23-5
Features:
P: Standard(default, lead free)
C: Customized
Trickle Charge
T: Trickle Charge
N: No Trickle Charge
Float Voltage
42……4.2V
43……4.3V
44……4.4V
TYPICAL APPLICATION
VCC
4.5V TO 6.5V
1μF VCC
BAT
BL4054
PROG
600mA
4.2V
Li-Ion
Battery
GND
1.65k
600mA Application Circuit
PPMIC BU
- 1 - www.belling.com.cn

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