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500mA/1.5A Standalone Linear Li-Ion Battery Charge
DESCRIPTION
The BL8573 is a single cell, fully integrated
constant current (CC)/constant voltage (CV) Li-ion
battery charger. Its compact package with
minimum external components requirement
makes the BL8573 ideal for portable applications.
No external sense resistor or blocking diode is
necessary for the BL8573. Build-in thermal
feedback mechanism regulates the charge
current to control the die temperature during
high power operation or at elevated ambient
temperature.
The BL8573 has a pre-charge function for trickle
charging deeply discharged batteries. The fast
charge current can be programmed by an
external resistor. CV regulation mode is
automatically enabled once the battery’s
charging curve reaches the constant voltage
portion. The output current then decays and is
finally terminated once the charge current drops
to 1/10
th
of the programmed value. The BL8573
keeps monitoring the battery voltage and enables
a new charge cycle once the voltage drops by
150mV below the CV value.
Power supply state is constantly monitored and
the battery drain current is reduced to minimum
value automatically when the BL8573 senses a
lack of input power. In its shutdown mode, the
BL8573 can reduce the supply current to less than
25μA. A status pin outputs a logic HIGH/LOW to
indicate the charging status and the presence of
power supply.
Other features include charge current monitor,
under-voltage lockout.
FEATURES
Standalone Capability with no Requirement
of External MOSFET, Sense Resistor or
Blocking Diode.
Complete Linear Charger in Compact Package
for Single Cell Lithium-Ion Batteries
Programmable Pre-charge, Fast Charge and
Termination Current.
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V/4.35V Charge Voltage with 1%
Accuracy
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25A Supply Current in Shutdown
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in SOT-23-6 and ESOP8 Package
APPLICATIONS
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooths Applications
TYPICAL APPLICATION
