1A, Single Cell Linear Lithium Battery Charger
E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 8 3H20N Rev. P001
General Description
The EC49018 is a complete constant - current &
constant-voltage linear charger for single cell lithium-ion
batteries. Its SOP-8(Exposed PAD) package and low
external component count make the EC49018 ideally
suited for portable applications. In addition, the
EC49018 can work within USB and wall adapter.
No blocking diode is required because of its
internal PMOSFET architecture which is able to prevent
the negative Charge Current. 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 EC49018 automatically terminates
the charge cycle when the charge current drops to
1/10th the programmed value after the final float voltage
is reached.
EC49018 Other features include current monitor, under
voltage lockout, automatic recharge and two status pin
to indicate charge termination and the presence of an
input voltage.
Features
Programmable Charge Current Up to 1000mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Complete Linear Charger in SOP-8 Package for
Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V Charge Voltage with ±1.5% Accuracy
Automatic Recharge
Two Charge Status Output Pins
C/10 Charge Termination
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available Radiator in SOP-8(Exposed PAD)
Package, the Radiator need connect GND or
impending
Applications
Cellular Telephones, PDA, MP3 Players
Charging Docks and Cradles
MP3、MP4 Player
Digital Still Cameras, Portable Devices
USB Bus-Powered Chargers, Chargers
