LX2201
TM
®
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
The LX2201 Linear Battery Charger is a
multi-state (2 stage) Li-Ion battery charger
(Constant current / Constant voltage) that
can supply up to 2A of charging current into
a single cell Li-Ion battery.
LX2201 is a cost effective , high perfor-
mance USB battery charger. The LX2201
features a 2A high charge current, with
automatic power savings using isolated
battery topology, user programmability in
USB charging, and an extended battery life
with low Rds
ON
in discharge.
In USB mode, the LX2201 has
advantages over competition chargers with
the USB Limit Control circuit and low
Rds
ON
in discharge mode. The USB limit
Control circuit allows simultaneous battery
charging while the device is in operation.
The V
DD
to supply load is independent of
the V
BAT
charging logic. In discharge mode
a low Rds
ON
provides low loss and heavy
transient.
The LX2201 is a low cost, highly
integrated battery charger solution. . It only
requires three external resistors: one for
setting the constant charge current level, one
for setting the termination charge current,
and one for setting V
IN
. It also has a built
in thermostat that will throttle back the
charge current to keep the die temperature
from exceeding 150°C; this feature insures
the LX2201 delivers the maximum charge
rate for a given thermal environment.
LX2201 support two types of Li-Ion
battery chemistry; 4.1V and 4.2V through
logical input (VM pin).. A high accuracy
current sensing circuit allows batteries to
be fully charged before terminating the
charge cycle.
The LX2201 design
enhances system battery life by avoiding
premature discharge of Li-Ion battery with
a separate battery terminal voltage from
system load when adaptor charging is used,
i.e. trickle charge.
The LX2201 provides a charging status
indicator. The integrated PMOS pass element
features low drop out voltage while providing
an inherent load disconnect with virtually no
drain on the battery when disabled or when
the input power is removed. Additionally a
battery load disconnect switch has been
integrated which provides seamless power
switching when transitioning between charge
and discharge modes.
The LX2201 features a pre-charge
conditioning mode for batteries that have
been deeply discharged and also has a top off
charge mode for batteries that are left on the
charger for extended periods.
The LX2201 is available in a high power
4mm x 4mm, 20-pin MLP, surface mount
package.
KEY FEATURES
2A Charge Current
USB Compliant Charging States
Low Rds
ON
in Discharge Mode
Power Saving and Conditional
Mode for Deep Discharge
Selectable Li-Ion Battery for 4.1V
or 4.2V Applications
Internal Pass Element Can
Function as a Reverse Direction
Load Switch
No Sense Resistor Required
Full Capacity Charging
True Charge Indicator
Wall Supply Regulator Tolerance
5V + 10%
Built In MOSFET Driver For Easy
AC Adapter/USB Implementation
Topping Charge with Voltage
Monitoring Mode
Inherent Load Disconnect
Small, High Power 20-lead MLP
package
APPLICATIONS
WWW .
Microsemi
.C
OM
Batteries with 350mAH to 2AH
Ratings
Cell Phones
PDAs
Charging Cradles
Digital Cameras
Low Cost Single Li-Ion Cell
Chargers
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
USB Lo / Hi
State Select Truth Table
VID0
VM
VID0
VID1
PSW
NC
VID1
0
1
0
To System
Regulator
VDD
BAT
0
0
1
VDD
BAT
VDD
AC/DC Adapter
VDD
LX2201
BAT
VDD > V
BAT
Switch open – charging
disabled.
Charging – USB high level if
using V
IN.
Charging – USB low level if
using V
IN.
Charging – USB high level if
using V
IN.
BAT
VIN
GND
CUS
CTP
CMP
CCP
USB POWER
1
1
V
BAT
> VDD
Switch open – discharge
disabled.
Switch open – discharge
disabled.
Battery Discharging. MOSFET
fully enhanced with current
flow V
BAT
to VDD.
Battery Discharging. MOSFET
fully enhanced with current
flow V
BAT
to VDD.
PACKAGE ORDER INFO
T
A
(°C)
0 to 70
Copyright
©
2000
Rev. 1.2b, 2005-04-13
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
STAT
LX2201
LX2201
LQ
Plastic MLP
4x4mm 20-Pin
LX2201CLQ
RoHS Complaint / Pb-free
Note: Available in Tape & Reel.
Append the letters “TR” to the part number.
(i.e. LX2201CLQ-TR)
Microsemi
Page 1
LX2201
TM
®
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
PSW
VID0
VID1
N.C.
VM
WWW .
Microsemi
.C
OM
Supply Voltage (VIN)..........................................................................-0.3V to 7V
Analog Input Signals (VIDx, VM, SNS) .............................................-0.3V to 7V
Battery Charging Current (I
BAT
).........................................................................2A
Discharge Current (I
VDD
)....................................................................................3A
Operating Junction Temperature.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Peak Package Solder Reflow Temp. (40 second max. exposure) ... 260°C (+0, -5)
V
IN
Maximum DC Current..........................................................................500mA
V
IN
Maximum Surge Current.............................................................................2A
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
.
20
19
18
17
16
15
14
13
12
VDD
VDD
VDD
VDD
VIN
1
2
3
4
5
6
7
BAT
BAT
BAT
BAT
CMP
Pad Is GND
8
9
10
11
GND
STAT
CTP
THERMAL DATA
LQ P
ACKAGE
(Top View)
N.C. – No Internal Connection
LQ
Plastic Micro Lead Frame Quad Package 20-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
RoHS / Pb-free 100% Matte Tin Lead Finish
40°C/W
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.
FUNCTIONAL PIN DESCRIPTION
Name
BAT
CCP
CMP
CTP
CUS
GND
NC
PSW
VDD
VIDx
VIN
VM
STAT
Description
Charging Output - This pin is wired to the positive terminal of the battery. (The negative battery terminal is wired to GND.)
Charge Current Programming Pin - A resistor (RCP) is connected between this pin and GND. The constant current is
65000
determined by the following relationship:
I
=
BAT(MAX)
RCP
Compensation Pin – Connect a 0.1uF compensation capacitor from this pin to VDD.
Charge Termination Programming Pin – A resistor (RTP) is connected between this pin and GND. The termination charge
7500
current is determined by the following relationship:
I
=
BAT(MIN)
RTP
Maximum VIN Current Programming Pin – A resistor (RUS) is connected between this pin and GND. The Hi Level charge
1211
current is determined by the following relationship:
I
=
IN(HI))
RUS
Common Ground
Not Connected. This pin is connected internally and should be left floating.
PMOS Switch driver – This output is designed to drive the gate of an external PMOS power switch. The driver is pulled low
(PMOS on state) when VDD > V
BAT
.
Common Power Node – Connects to system power bus.
State Select Input – Applying a two bit TTL compatible signal sets the desired state of the charger corresponding to the Truth
Table.
Voltage Input – Current limited USB input. Apply a USB compliant power input.
Voltage Mode Select - Selects the constant voltage. VM = Low to select 4.2V charge level. VM = High to select 4.1V charge
level.
Status - This pin is a logic high level when the battery is being charged. A low signal indicates either under voltage lockout,
charge completed, or V
BAT
> VDD, or VID0 = VID1 = 0.
CUS
CCP
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
©
2000
Rev. 1.2b, 2005-04-13
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2201
TM
®
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C
≤
T
A
otherwise noted and the following test conditions: VDD = 5.0V.
Parameter
MAIN CIRCUITRY
Input Voltage
Quiescent Current
CTP Bias Voltage
CCP Bias Voltage
CUS Bias Voltage
CONSTANT VOLTAGE MODE
Constant Voltage Charge Level
Maximum Dropout Voltage
Top Off Charge Droop Threshold
CONSTANT CURRENT MODE
BAT Constant Current Accuracy
BAT Constant Current Level
Conditioning Current
Conditioning Current Mode
Threshold Voltage
Charge Termination Current
Accuracy
USB CURRENT LIMIT
USB Low Current Limit
USB High Current Limit
LOGIC
STAT Logic High Output
STAT Logic Low Output
State Select Threshold
VM Select Threshold
≤
70°C except where
WWW .
Microsemi
.C
OM
Symbol
VDD
I
GND
V
CTP
V
CCP
V
CUS
V
CVL
V
IN
– V
BAT
V
DRP
I
CCL
I
BAT
I
COND
V
CTV
I
BAT
I
IN
I
IN
V
STAT
V
STAT
V
VID
V
VM
Test Conditions
Min
4.5
LX2201
Typ
Max
6
8
5
Units
V
mA
µA
V
V
V
V
mV
%
V
BAT
V
CVL
VDD > V
BAT
VDD < V
BAT
R
CTP
= 150K, I
BAT
> 100mA
4
3
1.25
1.25
2.6
4.16
4.06
96
4.2
4.1
97
1
VM = Low
VM = High
I
BAT
= 1A
4.24
4.14
350
98
1.15
2
6.0
68
65
100
500
5
0.4
0.8
%
R
CCP
= 64.9K
V
BAT
< (V
CVL
– 100mV)
V
BAT
< V
CTV
; @25°C
0.85
0.35
3.0
60
A
A
I
BAT
I
CCL
V
BAT
V
CVL
4.75
64
50
93
463
4.5
%
R
CTP
= 150K ; @25°C
V
IN
= 5V, VDD < V
IN
, VID1 = Lo, R
USB
= 2.55K
V
IN
= 5V, VDD < V
IN
, VID1 = Hi, R
USB
= 2.55K
V
IN
= 5.0V, I
STAT
= -5mA
V
IN
= 5.0V, I
STAT
= 25µA
Logic High
Logic Low
Logic High
Logic Low
V
IN
= 5.0V, I
OUT
= 1A, Temperature Rising
I
BAT
= -1A
V
IN
> V
BAT
+ V
CHG
V
IN
> V
BAT
+ V
DCH
Charge–to–discharge or Discharge–to–charge
V
IN
< V
BAT
, I
PSW
= 0, V
BAT
= 4.2V
V
IN
> V
BAT
, I
PSW
= 0
C
PSW
= 1000pF, to V
PSW
= (V
BAT
– 1V)
35
85
425
mA
mA
mA
V
V
V
V
°C
m
Ω
mV
mV
µs
V
V
K
Ω
Ns
2.0
2.0
0.8
130
140
130
5
5
5
4.2
0
10
500
150
150
10
10
THERMAL SHUTDOWN
Maximum Junction Temperature
T
J
BI-DIRECTIONAL PASS ELEMENT CONTROL
Discharge Switch On Resistance
R
DS(ON)
Charging Threshold
V
CHG
Discharging Threshold
V
DCH
Pass Element Switch Mode Delay
tsw
PSW FET DRIVER
High Output Voltage
V
PSW
Low Output Voltage
V
PSW
OR-ing Resistance
R
PSW
Switch Delay
t
PSW
(VDD > V
BAT
to VDD < V
BAT
)
0
0
E
LECTRICALS
E
LECTRICALS
4.1
5
0
0.2
15
1000
Copyright
©
2000
Rev. 1.2b, 2005-04-13
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2201
TM
®
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
SIMPLIFIED BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
VID0
CHARGE/
DISCHARGE
CONTROL
0.1
VIN
PSW
VDD
STAT
BAT
CHARGE
TERMINATION
CONTROL
CUS
VID1
CONSTANT
VOLTAGE
CONTROL
USB
LIMIT
CONTROL
CTP
VM
CMP
TEMPERATURE
CONTROL
CCP
CONSTANT
CURRENT
CONTROL
GND
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
Figure 1 –
Simplified Block Diagram
Copyright
©
2000
Rev. 1.2b, 2005-04-13
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2201
TM
®
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
APPLICATION CIRCUITS
WWW .
Microsemi
.C
OM
LX2201 C O N TR O L FLO W D IAG R AM
START
R ETUR N TO STAR T IF
VIN > VB AT O R VIDX C H AN G E STATE.
V
DD
>
V
B AT
YES
NO
VID 0 = 1
YE S
NO
VID0 = 1
YES
NO
VID 0 = 1
NO
NO
SW ITCH
O FF
V
B AT
>60%
YE S
C O N D ITIO N
CHARGE
MODE
YES
D IS C H A R G E
MODE
C O N S TAN T C U R R E N T
C H AR G E M O D E
I
U SB
D ETER M IN ED BY TH E
S TATE O F VID 1.
TEM P <
140
YE S
NO
TEM P <
140
YE S
NO
REDUCE
CHARGE
CURRENT
I
IN
REDUCE
CHARGE
CURRENT
<
I
US B
NO
I
IN
<
I
US B
NO
REDUCE
C H AR G E
CURRENT
NO
REDUCE
C H AR G E
CURRENT
YE S
YE S
I
BAT
<I
M IN
YE S
NO
V
B AT
> V
C V
YE S
VO LTAG E
M O NITO RIN G
M O D E (STATE).
CO NSTANT VO LTAG E
C H AR G E M O D E
V
B AT
<97%
Y ES
NO
A
PPLICATIONS
A
PPLICATIONS
R ETU R N TO TH E TO P
O F TH E C H AR T.
Figure 2 –
Control Flow Diagram
Copyright
©
2000
Rev. 1.2b, 2005-04-13
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
