BL4054/BL4054B
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in SOT23-5/TSOT23-5
FEATURES
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Preset 4.2V Charge Voltage with ±1%
Accuracy
Charge Current Monitor Output for Gas
Gauging
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Over-Voltage Protect
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25µA Supply Current in Shutdown
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
resistor is needed, and no blocking diode is
required due to the internal MOSFET
architecture.
Thermal
feedback regulates the charge 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 BL4054/BL4054B automatical
-ly 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/BL4054B
automatically enters a low current state, dropping
the battery drain current to less than 2µΑ. The
BL4054/BL4054B 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 termination and the
presence of an input voltage.
The only difference between BL4054 and
BL4054B is that at power on, BL4054 will check
the battery voltage first, it will not start charging
unless the battery voltage is below the
auto-rechrage threshold. BL4054B does not
perform this check. So BL4054B can guarantee
the high battery capacity at all time, while BL4054
can prevent the battery from being repeatedly
charged in some specific applications.
APPLICATIONS
Cellular and Smart Phones
Charging Docks and Cradles
BlueTooth Applications
PDAs
MP3/MP4/MP5 Players
DESCRIPTION
The BL4054/BL4054B is a complete constant
current / constant voltage linear charger for single
cell Lithium-Ion batteries. No external sense
ORDERING INFORMATION
BL4054/BL4054B – XX X X XXX
Package:
RN: SOT23-5
TRN: TSOT23-5
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
V
CC
4.5V to 6.5V
1uF
V
CC
BAT
600mA
BL4054/BL4054B
PROG
GND
4.2V
Li-Ion
Battery
1.65k
600mA Application Circuit
PPMIC BU
BL4054/BL4054B Rev 1.4
5/2009
www.belling.com.cn
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1
BELLING [ SHANGHAI BELLING CO., LTD. ]
