LX2208
2 Amp Three Level Lithium Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
KEY FEATURES
DESCRIPTION
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
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.
o
o
o
o
o
o
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
WWW . Microsemi .C OM
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
APPLICATIONS
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Navigation Devices
Multi-Media Players
Handheld Devices
Digital Cameras
PRODUCT HIGHLIGHT
Status
Charging
Adapter or USB
IN
STAT
Full
CMP
Adapter or USB
Select
Shutdown
H/L
SD
USB Hi/Low
TMP
20%
BAT
HCP
LCP
Power On
DC OK
LX2208
+
-
GND
Current
Programming
Battery
Battery
Temperature
Lockout
Sensing
LX2208
PACKAGE ORDER INFO
TA (°C)
LD
Plastic MLPD 3 x 3mm 12 pin
RoHS Compliant / Pb-free
-40 to 85
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
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
1
2
STAT
3
DC OK
4
SD
5
20%
6
12
BAT
11
TMP
10
HCP
9
LCP
8
H/L
7
GND
LD Package
(Top View)
THERMAL DATA
RoHS / Pb-free 100% matte Tin Pin Finish
LD
Plastic Micro Leadframe Package 12-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
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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
2208
XXXX
MSC
Supply Input Voltage (IN, BAT) ...................................................................... -0.3V to 7V
All other pins ............................................................................................-0.3V to VSUPPLY
Battery Charging Current .............................................................................................2.5A
Operating Ambient Temperature Range (TA) ..................................................-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)
33°C/W*
Junction Temperature Calculation: TJ = TA + (PD x θJA).
*The θJA 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
Pin
Description
12
CMP
2
Input, Compensation – Connect a series combination of a 1k resistor and 0.47µF capacitor from IN to CMP.
DC OK
4
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.
GND
7
Common Ground – Used as chip ground and as a reference for the battery return.
HCP
10
Input, High Current Programming and Termination Current Programming – A resistor (RHCP) between this pin and
GND sets the constant current high level. The following relationship determines the charging current of constant
current mode: Typically IBAT=7150/RHCP 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.
H/ L
8
High or Low load select logic input – A logic high selects the constant charge current level set by the HCP pin
resistor RHCP and a logic low selects the constant charge current level set by the LCP pin resistor RLCP.
IN
1
Input Power – Connect to a wall adapter or a USB port.
LCP
9
Input, Low Current Programming – A resistor (RLCP) between this pin and GND sets the constant current low
level. The following relationship determines the charging current of constant current mode: Typically
IBAT=7150/RLCP when H/ L is low and 20% is high.
SD
5
Input, Shutdown – A logic high places the LX2208 in shut down mode; it can also be used for USB suspend
mode.
STAT
3
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.
TMP
11
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 VIN or rises above
74% (typ) of VIN it suspends charging. Ground the TMP pin if it is not used.
20%
6
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 RLCP. A logic low selects 20% of the constant charge
current level set by the LCP pin resistor RLCP .
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
BAT
Output, Battery Connection – This pin is wired to the positive terminal of a single cell Lithium Ion/Polymer battery.
LX2208
®
TM
2 Amp Three Level Lithium Ion Battery Charger
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS
` 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
VIN
VIN(UVLO)
IIN
VBAT
VBAT
VBAT
IBAT
IBAT
IBAT
IBAT
IBAT
IBAT
IBAT
VBAT
IBAT
IBAT
VBAT
Rising input VBAT = 2.8V
4.35
2.9
VBAT = 4.2V (battery charged)
SD = High (shutdown mode)
4.2
4.2
4.2
2000
1000
453
453
20
100
50
2.7
250
125
97
4.22
4.24
4.24
2200
1100
500
476
22
150
75
2.9
2
50
V
V
mV
mA
µA
0°C ≤ TA ≤ 85°C
-40°C ≤ TA ≤ 85°C
96
98
VBAT
IBAT
IBAT
IBAT
96
VBAT = 4.2V (battery charged, VIN > 4.5V)
VBAT > VIN
VSD=High (shutdown mode)
97
5
5
2.5
98.5
15
15
5
%
µA
µA
µA
VSTAT
VSTAT
VIN = 5.0V, IDRV = -5mA
VIN = 5.0V, IDRV = 5mA
4.2
4.5
5
0.5
V
V
ILOG
VLOG(OUT)
4.18
4.16
4.10
1800
900
400
408
18
50
25
2.5
6
3.3
V
V
V
mA
mA
mA
mA
%
mA
mA
V
mA
mA
%
VLOG
IBAT < 100mA @ 25°C (4.5V to 5.5V)
IBAT < 100mA (4.5V to 5.5V)
IBAT < 100mA (4.35V to 6V)
RHCP = 3.57k
RHCP = 7.15k
RHCP = 15.8k
VH/ L = Low
I(V 20% = Low) / I (V 20% = High); VH/ L = Low
VBAT < VCCT; RHCP = 3.57k
VBAT < VCCT; RHCP = 7.15k
Rising Battery Voltage
RHCP = 3.57k
RHCP = 7.15k
5
3.1
225
1
10
Input Logic Threshold
450
725
1000
mV
Input Current, VLOG = 2V
Input Current, VLOG = 0V
Logic Hi Output, 10k Pull up to 3.3V
Logic Low Output, ILOG = 10mA
0
-2
3.2
2.5
0
5
2
µA
Rising Voltage
Falling Voltage
Falling Voltage
Rising Voltage
72
70.5
27
28
70
0.5
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Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C ≤ TA ≤ 85°C and the
following test conditions: VIN = 5.0V; VSD = Low; VH/ L = High, V 20% = High; VBAT = 3.6V; RHCP =15.8k, RLCP=15.8k; VTMP = 0V.
LX2208
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
V
` BATTERY TEMPERATURE MONITOR
Cold Threshold
Cold Threshold
Hot Threshold
Hot Threshold
TFB Disable Volt
VTFB
VTFB
VTFB
VTFB
VTFB
75
72
28
30
100
76.5
74
30
31
150
%VIN
% VIN
% VIN
% VIN
mV
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
-
WWW . Microsemi .C OM
+
SD
5
ENABLE
DCOK
4
UVLO
TMP
11
STAT
3
CHARGE
CONTROL
CMP
2
IN
BAT
1
12
CHARGE
TERMINATION
CONTROL
CONSTANT
VOLTAGE
CONTROL
TEMPERATURE
CONTROL
CONDITIONING
THRESHOLD
H/L
8
COND.
CURRENT
20%
6
LCP
9
10
LX2208
HCP
LOW
CHARGING
CURRENT
HIGH
CHARGING
CURRENT
GND
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
RETURN TO START IF
VDDBAT, UVLO, or SD CHANGES STATE.
START
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Definition of VDDBAT:
VDDBAT =1 if VIN >VBAT
=0 if VIN < VBAT
YES
SD
NO
NO
VIN > VBAT
SLEEP
YES
YES
UVLO
NO
VOLTAGE
MONITORING
MODE (STATE).
VBAT60%
NO
CONDITION
CHARGE
MODE
CONSTANT VOLTAGE
CHARGE MODE
YES
CONSTANT CURRENT
CHARGE MODE
IMAX DETERMINED BY THE
STATE OF H/L, RHCP, RLCP
and 20%.
TEMP < 130
TEMP <
130ºC
NO
NO
YES
REDUCE
CHARGE
CURRENT
ICC< IMAX
NO
YES
REDUCE
CHARGE
CURRENT
REDUCE
CHARGE
CURRENT
YES
NO
IBAT VCV
RETURN TO THE TOP
OF THE CHART.
YES
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
LX2208
2 Amp Three Level Lithium Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
APPLICATION CIRCUITS
Status
Adapter or USB
Power Pin
1k 0.47u
10k
Grounded Pin
in USB cable.
Leave open in
Adapter Cable.
IN
STAT
SD
USB Hi/Low
Full
DC OK
2.4k
Power On
LX2208
20%
LCP
15.8k
121k
TMP
24.9k
BAT
HCP
3.57k
Current
Programming
2.4k
CMP
H/L
Shutdown
Charging
WWW . Microsemi .C OM
2..4k
+
-
GND
Battery
Battery
Temperature
Lockout
Sensing
Figure 1 – Typical Application – 2A adapter charge current and 500mA or 100mA maximum USB charge currents. A grounded
spare pin in the USB power cable can be used to sense when the 500mA USB current power source is being used. This
application also uses three LED indicators for Power attached, Battery Charging and Battery Full. This configuration also
implements circuitry to lockout battery charging if the battery is less than 0ºC or greater than 60°C.
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 6
LX2208
TM
®
2 Amp Three Level Lithium Ion Battery Charger
P RODUCTION D ATA S HEET
THEORY OF OPERATION
INPUT SUPPLY QUALIFICATION
If the input supply is not high enough for the internal
4.2V reference to operate, charge termination will be
prevented. This may be useful if supply is severely current
limited.
CONDITIONING CURRENT CHARGE MODE
A conditioning current is applied to batteries that are
deeply discharged and have a terminal voltage less than
60% of the constant voltage level. The conditioning
current is 5% of the HCP programmable constant current
level. Once the battery terminal voltage exceeds the
conditioning current threshold, the full constant current
level is applied (unless charging current is limited by one
of the other charger control loops).
The IN input is monitored and DC OK is set to a logic
low to report the presence of the power source with
sufficient voltage to charge the battery. The DC OK
threshold is the larger of the UVLO threshold or the battery
voltage.
CHARGE TERMINATION MODE
To increase system battery life and avoid float charging,
the LX2208 disconnects the charger once the battery has
been fully charged. The charge termination state occurs at
the end of constant voltage mode. The termination current
is set by the value of the resistor RHCP connected between
HCP pin and GND. The STAT pin changes state when
charging is completed.
TOP OFF CHARGE MODE
Once the charger has completed a charge cycle, if power
remains applied, the LX2208 enters a Voltage Monitoring
mode. In this mode, the LX2208 monitors the battery
terminal voltage and applies a top off charge if the battery
voltage drops below the top off threshold.
Copyright © 2007
Rev. 1.0, 2007-04-03
DC OK
PROTECTION FEATURES
Conditioning Current Mode – If the battery terminal
voltage is less than 2.7V, the battery charger will reduce the
charge current to 5%. This also protects the appliance from
overheating by trying to drive the full charging current into a
short circuited battery.
Under Voltage Lockout – The charge cycle will not start
until the IN voltage rises above 3.1V. Hysteresis helps
alleviate chattering on and off.
Thermal Control Loop – If the power dissipation of the
charger becomes excessive, the charge current will be
linearly reduced to prevent the die temperature from getting
above 140°C. This does not cause the charge cycle to stop.
Reverse Current Blocking – If IN input is grounded,
current will not flow from the BAT pin through the charger.
No external blocking diode is required on the input.
Shut Down Mode – If the SD pin is asserted a logic high,
the charger enters a shut down mode where a very low
quiescent current prevents drain from the battery.
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2208
ADAPTER OR USB SELECTION
The LX2208 supports battery charging from a system
that provides adapter power or USB power using the same
external connector. Figure 1 shows one example of a
system using a special USB adapter cable to determine
whether the power source is USB or Wall Adapter.
Similarly, if the system processor senses the absence of
USB data, it can logically set the H/ L logic level high to
allow a higher charge current to be used.
USB CHARGE MODE AND CURRENT LIMIT
The LX2208 is fully compliant with, and supports, the
USB specifications – the Low Power Peripheral (100mA)
and High Power Peripherals (500mA). USB current levels
can be set using the appropriate values of the LCP
programming resistor RLCP. 20% logic input selects USB
high/low charge current. When the SD pin is pulled high,
the USB input enters Shut Down mode and will not present
a load to the IN pin.
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GENERAL DESCRIPTION
The LX2208 charges a single cell Lithium Ion or
Lithium Polymer battery using two steps: a constant
current mode followed by a constant voltage mode. The
maximum charging current during the Constant Current
Mode of the charging profile can be logically set (using
H/ L pin) to two resistor-programmable levels. The
resistor RHCP connected between HCP and GND pin sets
the higher level current. The resistor RLCP connected
between LCP and GND pin sets the lower level current.
There is also a 20% logic input that selects either the full
current set by the LCP resistor RLCP or 20% of that value.
The charger will terminate constant voltage charging once
the current drops below the taper current setting which is
10% of the high charge current setting (determined by
HCP resistor RHCP value).
Page 7
LX2208
2 Amp Three Level Lithium Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
APPLICATION NOTE
I HCP =
1.25
1.25
=
= 175µA
R HCP 7.15k
Charge Current vs IHCP (or ILCP)
2000
1600
1400
1200
1000
800
600
400
200
0
0
50
100
150
200
IHCP (in uA)
Copyright © 2007
Rev. 1.0, 2007-04-03
250
300
350
180
160
140
120
100
80
60
40
20
0
0
50
100
150
200
250
300
350
IHCP (in uA)
The termination current is always roughly 10% of the
maximum charge current set by the HCP resistor RHCP.
Constant Charge Current (in mA)
RHCP
43.3
169.28k
92
88.67k
460
15.80k
730
9.75k
1000
7.15k
2000
3.56k*
* RHCP minimum value
Termination Current (in mA)
RHCP
4.33
169.28k
9.2
88.67k
46
15.80k
73
9.75k
100
7.15k
200
3.56k*
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2208
Charge Current (in mA)
1800
Termination Current vs IHCP
200
Termination Current (in mA)
CURRENT PROGRAMMING RESISTORS
The LX2208 has two programming resistors to control
the battery charging current during the constant current
charging mode of the battery charging cycle. When the
H/ L pin is high (selecting the High Current charging
mode), the charge current is determined by the value of the
HCP programming resistor RHCP. The maximum charge
current is determined by the programming current at either
the HCP or LCP programming pins (depending on the state
of H/ L ); the range of each of these channels is identical.
The programming current is the HCP or LCP pin voltage
(typically 1.25V) divided by the value of the programming
resistor. For example, the HCP current with a 7.15k
resistor to GND is:
Using the table above it can be seen that for a
programming current value of 175µA, the corresponding
maximum charge current is 1A.
The termination current determines the point at which
the charge cycle is terminated and the battery is determined
to be fully charged. The termination current is determined
by the value of the HCP programming current as
determined by the HCP programming resistor RHCP. For a
value of IHCP = 175µA (as was used in the previous
example), the termination current from the chart below can
be seen to be 100mA.
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LAYOUT
In the layout of the Printed Circuit Board (PCB) it is
important to provide a low thermal impedance path from
the thermal pad on the bottom of the LX2208 package to
the ground plane of the circuit board to maximized heat
dissipation. Generally this is accomplished by the use of
multiple thermal vias. This insures the LX2208 stays cool
and can provide the maximum charge current to minimize
the time required to charge the battery.
For latch-up prevention purpose, it is important to place
10µF capacitors (X5R or X7R dielectric) close to the IN
and BAT pins. With long input cables to the adapter or
USB, it is best to use a sheathed cable or twisted wire cable
which is typical of most applications.
The CMP 0.47µF capacitor and 1k resistor should be
placed close to the CMP pin and IN pin; the CMP pin is
located adjacent to the IN pin to facilitate this.
Page 8
LX2208
®
TM
2 Amp Three Level Lithium Ion Battery Charger
P RODUCTION D ATA S HEET
APPLICATION NOTE
To finish the design it is necessary to create the
Thevenin Voltage and resistance using a voltage
divider from the input pin (IN).
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BATTERY TEMPERATURE MONITOR
The LX2208 has an input to monitor the battery
temperature during battery charging; this method
assumes the battery pack contains a thermistor
expressly for this purpose. A typical Lithium Ion
battery should only be charged within a temperature
range of 0°C to 60°C. For this calculation, a Vishay
NTHS0402N01N1003J Thermistor was used. This
thermistor has the value of 327kΩ at 0°C, 100kΩ at
25°C and 24.9kΩ at 60°C. The thermistor must be
biased with a Thevenin voltage source and series
resistance to achieve the proper TMP thresholds. A
fixed value resistor is added in series with the
thermistor to prevent it from becoming too low
impedance at high temperatures and causing the TMP
input to default to off.
VIN
R1
TMP
RMIN
R2
RNTC
The values of R1 and R2 can be calculated as:
VTH
R1 =
RTH
TMP
R2 =
RMIN
RNTC
R TH
= 122k
K
R 1 × R TH
= 14,800k
R 1 − R TH
In this case, it is not necessary to use R2, because the
value is so large it is insignificant. In this case, R1 = RTH.
Using a value of RMIN that is equal to the thermistor
temperature at 60°C works well; therefore, for this
example, set the value of RMIN to 24.9k. This has the
effect of adding 24.9k to the thermistor resistance
values so it becomes 352kΩ at 0°C, 125kΩ at 25°C and
49.8kΩ at 60°C.
The final circuit for this example is:
VIN
121k
TMP
24.9k
The equations for RTH and VTH are, using Cold
Temperature Fault Threshold average of 74% and the
Hot Temperature Fault Threshold average of 29% of
VIN:
VTH
0.29 × 0.74 × (R T =0° C − R T =60° C )
=
VIN (0.29 × R T =0° C ) − (0.74 × R T =60° C )
The TMP voltages with this circuit are:
⎛ K
⎞
R TH = ⎜
− 1⎟ × R T =0ºC = 121k
⎝ 0.74 ⎠
Where R at temperature is the sum of the thermistor
plus RMIN.
RNTC
971k
327k
100k
24.9k
12.6k
VTMP (%VIN)
89%
74%
51%
29%
24%
LX2208
TEMP (°C)
-20
0
25
60
80
= K = 0.99
Copyright © 2007
Rev. 1.0, 2007-04-03
RNTC
At the trip point threshold, there may be chattering on
and off of the charging current. However, as the
temperature increases or decreases further from the trip
point threshold, the chattering will stop.
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX2208
®
TM
2 Amp Three Level Lithium Ion Battery Charger
P RODUCTION D ATA S HEET
APPLICATION NOTE
Conditions
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POWER STATUS INDICATORS
The STAT pin is designed to source or sink current.
LEDs can be configured to indicate charging or battery full.
The battery full indicator can be connected to DC OK
rather than GND to insure it is off when the input power is
removed and the STAT pin and DC OK pin go to a high
impedance state.
STAT
Charge in Process
Low
Charge Completed
High
Input Power Removed
Hi Z
CHARGING PROFILE
CONDITIONING CURRENT
Conditioning Current vs IHCP
Battery Charging USB High Level
100
0.45
4.20
0.40
0.35
Vbat
0.30
Ibat
4.10
0.25
4.05
0.20
0.15
4.00
0.10
3.95
Battery Cuurent
Battery V oltage
4.15
Conditioning Current (in m A)
0.50
4.25
80
60
40
20
0.05
3.90
0.00
0.0
60.0
120.0
0
0
Time in minutes
50
100
150
200
250
300
350
IHCP (in uA)
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 10
LX2208
2 Amp Three Level Lithium Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
PACKAGE DIMENSIONS
LD
12-Pin Plastic MLP Dual Exposed Pad
WWW . Microsemi .C OM
D
D2
L
K
E
E2
Pin 1 ID
A
e
Dim
A
A1
A3
D
E
D2
E2
e
K
L
b
A3
A1
b
MILLIMETERS
MIN MAX
0.80 1.00
0.00 0.05
0.20 REF
3.00 BSC
3.00 BSC
1.87 2.12
1.06 1.31
0.45 BSC
0.20 MIN
0.30 0.50
0.15 0.25
INCHES
MIN
MAX
0.031
0.039
0.000
0.002
0.008 REF
0.118 BSC
0.118 BSC
0.074
0.083
0.042
0.052
0.018 BSC
0.008 MIN
0.012
0.020
0.006
0.010
Note:
1.
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
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 11
LX2208
Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall
not include solder coverage.
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