LX2208
TM
®
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’s
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
(°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 “TR” to the part number. (i.e. LX2208ILD-TR)
Copyright
©
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
Page 1
LX2208
TM
®
2 Amp Three Level Lithium Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
PACKAGE PIN OUT
ABSOLUTE MAXIMUM RATINGS
Supply Input Voltage (IN, BAT) ...................................................................... -0.3V to 7V
All other pins ............................................................................................-0.3V to V
SUPPLY
Battery Charging Current .............................................................................................2.5A
Operating Ambient Temperature Range (T
A
) ..................................................-40 to 125°C
Maximum Operating Junction Temperature .............................................................. 150°C
Storage Temperature Range.........................................................................-65°C to 150°C
Lead Temperature (Soldering 10 seconds)................................................................. 300°C
Peak Temp. for Solder Reflow (40 seconds maximum exposure).................. 260°C (+0 -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
IN
CMP
STAT
DC OK
SD
20%
1
12
BAT
2208
XXXX
MSC
LD Package
(Top View)
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2
3
4
5
6
11
10
9
8
7
TMP
HCP
LCP
H/L
GND
THERMAL DATA
RoHS / Pb-free 100% matte Tin Pin Finish
LD
Plastic Micro Leadframe Package 12-Pin
33°C/W*
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
*The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system. All of
the above assume no ambient airflow. See layout guidelines section for important details.
FUNCTIONAL PIN DESCRIPTION
Name
BAT
CMP
DC OK
Pin
12
2
4
7
10
Description
Output, Battery Connection – This pin is wired to the positive terminal of a single cell Lithium Ion/Polymer battery.
Input, Compensation – Connect a series combination of a 1k resistor and 0.47µF capacitor from IN to CMP.
Output, Power status logic pin and LED driver – This pin is an open drain output that can sink 10mA of current to
drive an external LED. This pin is low impedance to GND when the IN pin input voltage is high enough to charge
the battery.
Common Ground – Used as chip ground and as a reference for the battery return.
Input, High Current Programming and Termination Current Programming – A resistor (R
HCP
) between this pin and
GND sets the constant current high level. The following relationship determines the charging current of constant
current mode: Typically I
BAT
=7150/R
HCP
when H/
L is high. The termination current is set to 1/10 of the HCP
current level, and the conditioning current is set to 1/20 of the HCP current level.
GND
HCP
H/ L
IN
LCP
SD
STAT
8
1
9
5
3
High or Low load select logic input – A logic high selects the constant charge current level set by the HCP pin
resistor R
HCP
and a logic low selects the constant charge current level set by the LCP pin resistor R
LCP
.
Input Power – Connect to a wall adapter or a USB port.
Input, Low Current Programming – A resistor (R
LCP
) between this pin and GND sets the constant current low
level. The following relationship determines the charging current of constant current mode: Typically
I
BAT
=7150/R
LCP
when H/ L is low and
20%
is high.
Input, Shutdown – A logic high places the LX2208 in shut down mode; it can also be used for USB suspend
mode.
Output, Charging status logic pin and LED driver – This pin can source or sink 5mA of current to drive an external
LED in either output state. This pin is low when the battery is in charging mode and becomes high when the
charge cycle is finished. It becomes high impedance when the input power is removed.
Input, Battery Temperature Monitor – This sense pin determines the battery temperature. It is connected to a
resistor network as defined in the application note. When the TMP pin falls below 29% (typ) of V
IN
or rises above
74% (typ) of V
IN
it suspends charging. Ground the TMP pin if it is not used.
20%
Select logic input – This pin is only monitored when the H/ L pin is low. A logic high on
20%
pin selects the
constant charge current level set by the LCP pin resistor R
LCP.
A logic low selects 20% of the constant charge
current level set by the LCP pin resistor R
LCP
.
LX2208
LX2208
TMP
11
20%
6
Copyright
©
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
Page 2
LX2208
TM
®
2 Amp Three Level Lithium Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C
≤
T
A
≤
85°C and the
following test conditions: V
IN
= 5.0V; V
SD
= Low; V
H/
L
= High, V
20%
= High; V
BAT
= 3.6V; R
HCP
=15.8k, R
LCP
=15.8k; V
TMP
= 0V.
LX2208
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
INPUT CIRCUITRY
Input Voltage
Under Voltage Charging Lockout
IN UVLO Hysteresis
IN Input Supply Current
BATTERY CHARGER
Constant Voltage Charging
Constant Voltage Charging
Constant Voltage Charging
Charge Current
Charge Current
Charge Current
Low Level Charge Current
20% Charge Current Ratio
Condition Current
Condition Current
Conditioning Current Threshold
Termination Current
Termination Current
Top Off Threshold
Top Off Threshold
Battery Drain Current
Battery Drain Current
Battery Drain Current
LOGIC
STAT High Output
STAT Low Output
Input Logic : SD,
H/
L
,
20%
Input Current : SD,
H/ L
,
20%
Output Logic :
DC OK
BATTERY TEMPERATURE MONITOR
Cold Threshold
Cold Threshold
Hot Threshold
Hot Threshold
TFB Disable Volt
V
IN
V
IN(UVLO)
I
IN
V
BAT
V
BAT
V
BAT
I
BAT
I
BAT
I
BAT
I
BAT
I
BAT
I
BAT
I
BAT
V
BAT
I
BAT
I
BAT
V
BAT
V
BAT
I
BAT
I
BAT
I
BAT
V
STAT
V
STAT
V
LOG
I
LOG
V
LOG(OUT)
V
TFB
V
TFB
V
TFB
V
TFB
V
TFB
Rising input V
BAT
= 2.8V
V
BAT
= 4.2V (battery charged)
SD = High (shutdown mode)
I
BAT
< 100mA @ 25°C (4.5V to 5.5V)
I
BAT
< 100mA (4.5V to 5.5V)
I
BAT
< 100mA (4.35V to 6V)
R
HCP
= 3.57k
R
HCP
= 7.15k
R
HCP
= 15.8k
V
H/
L
= Low
I(
V
20%
=
Low) / I (
V
20%
= High
); V
H/
L
= Low
V
BAT
< V
CCT
;
R
HCP
=
3.57k
V
BAT
< V
CCT
;
R
HCP
=
7.15k
Rising Battery Voltage
R
HCP
= 3.57k
R
HCP
= 7.15k
4.18
4.16
4.10
1800
900
400
408
18
50
25
2.5
4.35
2.9
5
3.1
225
1
10
4.2
4.2
4.2
2000
1000
453
453
20
100
50
2.7
250
125
97
97
5
5
2.5
4.5
725
2.5
0
6
3.3
2
50
4.22
4.24
4.24
2200
1100
500
476
22
150
75
2.9
V
V
mV
mA
µA
V
V
V
mA
mA
mA
mA
%
mA
mA
V
mA
mA
%
%
µA
µA
µA
V
V
mV
µA
V
%V
IN
% V
IN
% V
IN
% V
IN
mV
ELECTRICAL CHARACTERISTICS
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V
BAT
= 4.2V (battery charged,
V
IN
> 4.5V)
V
BAT
> V
IN
V
SD
=High (shutdown mode)
V
IN
= 5.0V, I
DRV
= -5mA
V
IN
= 5.0V, I
DRV
= 5mA
Input Logic Threshold
Input Current, V
LOG
= 2V
Input Current, V
LOG
= 0V
Logic Hi Output, 10k Pull up to 3.3V
Logic Low Output, I
LOG
= 10mA
Rising Voltage
Falling Voltage
Falling Voltage
Rising Voltage
4.2
450
0
-2
3.2
0
°
C
≤
T
A
≤
85
°
C
-40
°
C
≤
T
A
≤
85
°
C
96
96
98
98.5
15
15
5
5
0.5
1000
5
2
0.5
72
70.5
27
28
70
75
72
28
30
100
76.5
74
30
31
150
LX2208
LX2208
Copyright
©
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
Page 3
LX2208
TM
®
2 Amp Three Level Lithium Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
SIMPLIFIED BLOCK DIAGRAM
-
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OM
+
SD
5
UVLO
TMP
ENABLE
DCOK
4
11
CMP
STAT
CHARGE
CONTROL
3
2
IN
BAT
1
12
CONSTANT
VOLTAGE
CONTROL
CHARGE
TERMINATION
CONTROL
TEMPERATURE
CONTROL
CONDITIONING
THRESHOLD
H/L
8
20%
COND.
CURRENT
6
LCP
LOW
CHARGING
CURRENT
9
LX2208
LX2208
HCP
10
GND
HIGH
CHARGING
CURRENT
7
Copyright
©
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
Page 4
LX2208
TM
®
2 Amp Three Level Lithium Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
CONTROL LOGIC DIAGRAM
START
RETURN TO START IF
V
DDBAT
, UVLO, or SD CHANGES STATE.
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Definition of V
DDBAT
:
V
DDBAT
=1 if V
IN
>V
BAT
=0 if V
IN
< V
BAT
SD
NO
YES
V
IN
> V
BAT
YES
NO
SLEEP
UVLO
NO
YES
VOLTAGE
MONITORING
MODE (STATE).
V
BAT
<97%
YES
NO
V
BAT
>60%
YES
NO
CONDITION
CHARGE
MODE
CONSTANT VOLTAGE
CHARGE MODE
CONSTANT CURRENT
CHARGE MODE
I
MAX
DETERMINED BY THE
STATE OF H/L, R
HCP
, R
LCP
and 20%.
TEMP <
130
YES
NO
REDUCE
CHARGE
CURRENT
TEMP <
130ºC
YES
NO
REDUCE
CHARGE
CURRENT
I
CC
<
I
MAX
YES
NO
REDUCE
CHARGE
CURRENT
I
CC
<
I
MAX
YES
NO
REDUCE
CHARGE
CURRENT
LX2208
LX2208
NO
I
BAT
<I
TAPER
YES
I
TAPER
DETERMINED BY
R
HCP
.
NO
V
BAT
> V
CV
YES
RETURN TO THE TOP
OF THE CHART.
Copyright
©
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
Page 5
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