The LP28057 is
a complete
constant-current/
constant-
voltage linear charger for single
cell
lithium-ion batteries. Its ESOP-8 package and low
external component count make the LP28057 ideally
suited for portable applications. No external sense
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 ISET rammed
externally with
single
resistor.
The
LP28057
automatically terminates the charge cycle when the
charge current drops to 1/10th the ISET rammed value
after the final float voltage jis reached. When the input
supply is removed, the LP28057 automatically enters
a low current state, dropping the battery drain current
to less than 1μA. The LP28057 can be put into
shutdown mode, reducing the supply current to 1μA.
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.
特点
Protection of Reverse Connection of Battery
Programmable Charge Current Up to 1200mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
4.2V Charge Voltage with土1 % Accuracy
Short-circuit protection
1μA Supply Current in Shutdown
Consumption Available in ESOP-8 Package
RoHS Compliant and 100% Lead (Pb)-Free
应用
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Bluetooth Applications
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