BL4056 Datasheet, PDF (1/17 Pages) SHANGHAI BELLING CO., LTD. – 1A Lithium Ion Battery Linear Charger

BL4056
1A Lithium Ion Battery Linear Charger BL4056
General Description
BL4056 is a complete constant-current/constant voltage
linear charger for single cell lithium-ion batteries. With a
thermally enhanced 8-PIN SOP package on the bottom
and low external component count make the BL4056
ideally suited for portable applications. Furthermore the
BL4056 is specifically designed to work within USB power
specifications.
No external sense resistor is needed and no blocking
diode is required due to the internal PMOSFET
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/4.34V,and the charge current can be
programmed externally with a single resistor. The BL4056
automatically terminates the charge cycle when the charge
current drops to 1/10^th the programmed value after the final
float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed the BL4056 automatically enters a low current
state dropping the battery drain current to less than
2µA.The BL4056 can be put into shutdown mode reducing
the supply current to 55µA.
Other features include Battery temperature monitor,
under-voltage lockout, automatic recharge and two status
pins to indicate charge and charge termination.
Features
●Protection of battery cell reverse connection
● Programmable charge current up to 1A
●No MOSFET sense resistor or blocking diode
required
●Complete linear Charger in SOP8 Package for
single Cell Lithium-Ion Batteries.
●Constant-Current/Constant-Voltage operation
with thermal regulation to maximize Rate
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● Preset 4.2V/4.34V charge voltage with ±1%
accuracy
● Automatic Recharge
● Two Status Indication for Charge status, no
battery and battery failure indicators
● C/10 charge termination
● 55µA supply current in shutdown
● 2.9V trickle current charge threshold
● Soft-Start limits inrush current
● Battery Temperature Sensing
Applications
●Cellular Telephones
●Digital Still Cameras
●MP3 Players
●Bluetooth Applications
●Portable Devices
●USB Bus-Powered Chargers
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