AS3020
800mA Linear Battery Charger
In SOT23-5LPackage
DESCRIPTION
FEATURES
AS3020 is a complete constant - current and
constant-voltage linear charger for single cell
lithium-ion and Lithium-Polymer batteries. Its
SOT23-5L Package and low external component
count make AS3020 ideally suited for portable
applications. Furthermore the AS3020 is specifically
designed to work within USB power specification. At
the same time AS3020 can also be used in the
standalone lithium-ion and Lithium-polymer battery
charger.
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Constant-Current/Constant-Voltage Operation
with Thermal Protection to Maximize Charge
Rate without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Press 4.2V Charge Voltage with ± 1% Accuracy
25μA. Supply Current in Shutdown
2.9V Trickle Charge Threshold
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 programmed externally with a single
resistor. The A3020 automatically terminates the
charge cycle when the charge current drops to
1/10th the programmed value after the final float
voltage is reached.
Available Without Trickle Charge
Soft-Start Limits Inrush Current
Available in SOT23-5L Package
APPLICATIONS
Cellular Telephones,
PDA’s, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
“ANI” and “ANISEM” is Trademarks of ANISEM Semiconductor, Inc.
When the input supply (wall adapter or USB supply)
is removed the AS3020 automatically enters a low
current stagedropping the battery drain current to
less than 2μA. The AS3020 can be put into
shutdown mode reducing the supply current to 25μA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a
status pin to indicate termination and the presence of
an input voltage.
TYPICAL APPLICATION
VIN
4.5V to 6.5V
4
VCC
LED
AS3020
3
BAT
330
4.2V
Li-lon
Batery
5
ORDER INFORMATION
PROG
1
Part Number
Operating Temperature
CHRG
1.65K
AS3020EGT
-40°C to 85°C
GND
2
EVALUATION BOARD
Board Number
Dimensions
50mmX x 50mmY x 1.4mm
Z
EV3020EG-00A
AS3020 Rev.1.6
10/25/2009
www.anisem.com
1
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© 2008 ANISEM All Rights Reserved.