1A, Single Cell Linear Lithium Battery Charger

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4J30N Rev. F001

EC49022

General Description

The EC49022 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 EC49022 ideally

suited for portable applications. In addition, the

EC49022 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 4.3V, and

the charge current can be programmed externally with a

single resistor. The EC49022 automatically terminates

the charge cycle when the charge current drops to

1/10th the programmed value after the final float voltage

is reached.

EC49022 Other features include battery temperature

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



Preset 4.3V Charge Voltage with ±1% Accuracy



Automatic Recharge



Two Charge Status Output Pins



C/10 Charge Termination



2.9V Trickle Charge Threshold



Soft-Start Limits Inrush Current



Battery Temperature monitor

Applications



Cellular Telephones, PDA, MP3 Players



Charging Docks and Cradles



MP3、MP4 Player



Digital Still Cameras, Portable Devices



USB Bus-Powered Chargers, Chargers

Application Diagram