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PDF ( 数据手册 , 数据表 ) BL8572

零件编号 BL8572
描述 Li-ion battery charger
制造商 BELLING
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BL8572 数据手册, 描述, 功能
BL8572
GENERAL DESCRIPTION
The BL8572 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 BL8572 ideal for portable applications.
No external sense resistor or blocking diode is
necessary for the BL8572. Build-in thermal
feedback mechanism regulates the charge current
to control the die temperature during high power
operation or at elevated ambient temperature.
The BL8572 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 1/10th of the programmed
value. The BL8572 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 BL8572 senses a lack of
input power. In its shutdown mode, the BL8572
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.
APPLICATION CIRCUIT
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 Charge Voltage with ±1%
Accuracy
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
APPLICATIONS
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
http://www.belling.com.cn
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BL8572 pdf, 数据表
BL8572
prevents the temperature from further increase
and ensure device safe operation.
Undervoltage Lockout (UVLO)
Build-in undervoltage lockout circuit monitors
the input voltage and keeps the charger in
shutdown mode until VCC rises above the
undervoltage lockout threshold. The UVLO
circuit has a built-in hysteresis of 200mV.
Furthermore, to protect against reverse current in
the power MOSFET, the UVLO circuit keeps the
charger in shutdown mode if VCC falls to within
30mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come
out of shutdown mode until VCC rises 100mV
above the battery voltage.
Manual Shutdown
Floating the PROG pin by removing the resistor
from PROG pin to ground can put the device in
shutdown mode. The battery drain current is thus
reduced to less than 5µA and the supply current to
less than 50µA. Reconnecting the resistor back will
restart a new charge cycle.
Once manually shutdown, the CHRG pin is in a
weak pull-down state if VCC is above UVLO
voltage. The CHRG pin is in a high impedance state
if the BL8572 is in undervoltage lockout mode.
Automatic Recharge
After the termination of the charge cycle, the
BL8572 constantly monitors the BAT pin voltage
and starts a new charge cycle when the battery
voltage falls below 4.05V, keeping the battery at
fully charged condition. CHRG output enters a
strong pull-down state during recharge cycles.
http://www.belling.com.cn
Figure 1. Charge Cycle Diagram
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Total 11 Pages














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