LX2208
TM
廬
2 Amp Three Level Lithium Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
Up to 2A Charging Current
Integrated Power MOSFET
Three Charge Levels for
Adapter, and USB Hi and Low
Charge Battery from a Current
Limited Adapter
0.5% Battery Voltage Accuracy
USB Current Compliance
Battery Full Indicator
CC/CV with Thermal Feedback
Battery Temperature Monitor
Precision Charge Termination
Protection features:
Unsafe Battery Temp Lockout
Internal IC Temp Regulator
USB Current Limiter
Reverse Current Blocking
Under Voltage Lockout
False Termination Prevention
under Low Supply Conditions
The LX2208 is a single cell
Lithium Ion or Lithium Polymer
battery charger. The controller will
charge a single cell Li-Ion battery
from either a wall adapter or a USB
power source. A low under-voltage
lockout level increases usable
charging range from a current limited
power source. In addition, there is a
linear die temperature thermal control
loop, which limits the heat dissipation
while still charging the battery. There
are three logic selectable and
programmable charge current levels:
the high charge programming level is
typically set for charging from the
wall adapter, the low level charge
programming is typically set to
500mA for full USB charging and
100mA (20%) for reduced USB
charging.
In addition to setting the high-level
charge current, the HCP programming
resistor also sets the termination
current at 10% of the constant current
level and the conditioning current at 5%
of the constant current level. Power
status indicators STAT and
DC OK
can
be configured to show charge in
progress, battery fully charged and
external power on. The STAT pin is
capable of sourcing or sinking 5mA.
The
DC OK
output is an open drain
output and can sink 10mA.
The LX2208 enters a low quiescent
current shut down when power is
removed from the IN pin or when it is
logically shutdown to minimize battery
drain.
Protection features include: under
voltage lock out, reverse current
blocking on the IN pin, internal die
temperature thermal loop to reduce
charge current to maintain a safe die
temperature, and a unsafe battery
temperature charge inhibitor.
For
charging deeply discharged batteries,
the controller includes a conditioning
charge mode. The LX2208 comes in a
3x3mm 12 pin MLPD package.
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APPLICATIONS
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
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PRODUCT HIGHLIGHT
Status
Charging
Adapter or USB
Adapter or USB
Select
Shutdown
USB Hi/Low
IN
CMP
H/L
SD
20%
HCP
LCP
Current
Programming
GND
Battery
STAT
Full
DC OK
TMP
BAT
+
-
Battery
Temperature
Lockout
Sensing
Power On
LX2208
LX2208
LX2208
PACKAGE ORDER INFO
T
A
(擄C)
-40 to 85
LD
Plastic MLPD 3 x 3mm 12 pin
RoHS Compliant / Pb-free
LX2208ILD
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX2208ILD-TR)
Copyright
漏
2007
Rev. 1.0, 2007-04-03
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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