LX2202
TM
®
2A Li-Ion Linear Charger and Power Control
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
The LX2202 Linear Battery Charger is a
multi-state (2 stage) Li-Ion battery charger
(Constant current / Constant voltage) that is
designed to minimize battery charge time
(even from current limited sources such as
USB) and provide a simplified interface to
control battery discharge.
LX2202 features up to 2A charging
current from an AC adapter and an isolated
battery topology to minimize charge time
from current limited sources such as USB.
A thermal control loop maintains a safe
operating temperature at all times.
The LX2202 provides a seamless
complete battery interface. When the input
power source is removed, the LX2202
provides the discharge path for the battery
with extremely low discharge impedance.
This eliminates the need for external
discharge switch and voltage supervisors.
In USB mode, the LX2202 provides
three levels of current limit: 100mA,
500mA, and off.
The LX2202 (compared to the LX2201)
has improved charge and discharge mode
detection circuitry. A UVLO feature prevents
battery charging when VDD is less than 3.6V.
The LX2202 uses three resistors to
program the constant charge current level, for
setting the termination charge current, and for
varying the USB charge current limits.
LX2202 support two types of Li-Ion
battery chemistry; 4.1V and 4.2V through
logical input (VM pin). The LX2202
provides a charging status indicator.
The LX2202 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 LX2202 is available in a high power
4mm x 4mm, 20-pin MLP, surface mount
package.
KEY FEATURES
Up to 2A Charge Current
Internal Pass Element Can
Function as a Reverse Direction
Load Switch
USB Compliant Charging States
using optional USB input
Isolated Battery Topology
Low Rds
ON
in Discharge Mode
Full Capacity Charging
True Charge Indicator
Wall Supply Regulator Tolerance
5V + 10%
Topping Charge with Voltage
Monitoring Mode
Improved charge/discharge mode
detection circuitry
Small, High Power 20-lead MLP
package
Selectable Li-Ion Battery for 4.1V
or 4.2V Applications
APPLICATIONS
Batteries up to 4AH Ratings (C/2)
Cell Phones
PDAs
Charging Cradles
Digital Cameras
Low Cost Single Li-Ion Cell Chargers
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
Patent Pending
PRODUCT HIGHLIGHT
Power On/Off
VM
VID0
VID1
PSW
NU
State Select Truth Table
VID0
Main Internal
Power Bus
B220
VDD
NU
VID1
0
1
0
0
0
10µF
VDD
BAT
Wall Adapter
VDD
VDD
LX2202
BAT
BAT
VDD > V
BAT
Switch open – charging
disabled.
Charging – USB high level if
using USB
.
Charging – USB low level if
using USB
.
Charging – USB high level if
using USB
.
USB
CMP
0.1µF
10µF
2.55k
105k
72.3k
To VDD
1
2.49k
Charge
Indicator
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.
STAT
PACKAGE ORDER INFO
T
A
(°C)
-40 to 125
GND
CUS
CCP
CTP
LQ
Plastic MLP
4x4mm 20-Pin
LX2202CLQ
RoHS Compliant / Pb-free
Note: Available in Tape & Reel.
Append the letters “TR” to the part number.
(i.e. LX2202CLQ-TR)
LX2202
LX2202
Copyright
©
2004
Rev. 1.0a, 2006-02-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX2202
TM
®
2A Li-Ion Linear Charger and Power Control
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
WWW .
Microsemi
.C
OM
Supply Voltage (V
USB
or V
DD
) ..........................................................-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
USB Maximum DC Current .......................................................................500mA
USB Maximum Surge Current...........................................................................2A
RoHS / Pb-free Peak Package Solder Reflow Temperature
(40 second 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
.
PSW
17
VID0
VID1
20
VM
19
18
16
15
14
13
12
VDD
VDD
VDD
VDD
USB
NU
1
2
3
4
5
6
7
NU
BAT
BAT
BAT
CMP
Pad Is GND
8
9
10
11
STAT
CUS
CTP
GND
LQ P
ACKAGE
THERMAL DATA
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
LQ
Plastic Micro Lead Frame Quad Package 20-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
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
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
determined by the following relationship:
73200
I
BAT( MAX)
=
R
CCP
Compensation Pin – Connect a 0.1µF compensation capacitor from this pin to VDD.
Charge Termination Programming Pin – A resistor (RTP) is connected between this pin and GND. The termination charge
current is determined by the following relationship:
5250
I
BAT( MIN)
=
R
CTP
CUS
GND
NU
PSW
VDD
VIDx
USB
VM
STAT
Maximum USB Current Programming Pin – A resistor (RUS) is connected between this pin and GND. The Hi Level charge
current is determined by the following relationship:
1211
I
USB( HIGH)
=
R
USB
Common Ground
This pin is floating and will not affect performance.
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 charge level. Wired to USB for 4.1V and GND for 4.2V.
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.
CCP
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
©
2004
Rev. 1.0a, 2006-02-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2202
TM
®
2A Li-Ion Linear Charger and Power Control
P
RODUCTION
D
ATA
S
HEET
Unless otherwise specified, the following specifications apply over the ambient temperature 0°C
≤
T
A
≤
70°C except where otherwise
noted and the following test conditions: VDD = 5.0V, VM = GND, VID0 = VID1 = VBAT, RCCP = 72.3k, RCTP = 105k, RUSB =
2.55k.
Parameter
MAIN CIRCUITRY
Input Voltage
USB Input voltage
Under Voltage Charging Lockout
Quiescent Current
CTP Bias Voltage
CCP Bias Voltage
CUS Bias Voltage
CONSTANT VOLTAGE MODE
Constant Voltage Charge Voltage
Top Off Charge Droop Threshold
CONSTANT CURRENT MODE
BAT Constant Current Accuracy
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
ELECTRICAL CHARACTERISTICS
WWW .
Microsemi
.C
OM
Symbol
VDD
V
USB
VDD
UVLO
I
GND
V
CTP
V
CCP
V
CUS
V
CVL
V
DRP
I
CCL
I
COND
V
CTV
I
BAT
I
IN
I
IN
V
STAT
V
STAT
V
VID
V
VM
@25°C
Test Conditions
Min
4.5
4.35
LX2202
Typ
Max
6
6
3.85
4
40
15
Units
V
V
V
mA
µA
µA
V
V
V
V
%
V
BAT
V
CVL
VBAT = 0; Rising VDD
VDD > V
BAT
VDD < V
BAT
VDD < V
BAT
, VID0 = VID1 = 0V
I
BAT
> 100mA
3.60
2.1
20
9
1.26
1.26
2.6
4.16
4.06
96
0.85
4.2
4.1
97
1
4.6
2.8
35
85
425
50
93
463
4.5
2.0
VM = Lo; -40C to 125C
VM = Hi; -40 to 125C
4.24
4.14
98
1.15
6.0
A
%
I
BAT
I
CCL
V
BAT
< V
CTV
; @25°C
3.0
V
65
100
500
5
0.4
0.8
mA
mA
mA
V
V
V
V
°C
m
Ω
mV
mV
µs
V
V
K
Ω
Ns
mV
mV
V
USB
= 5V, VDD < V
USB
, VID1 = Lo
V
USB
= 5V, VDD < V
USB
, VID1 = Hi
V
USB
= 5.0V, I
STAT
= -5mA
V
USB
= 5.0V, I
STAT
= 25µA
Logic Hi
Logic Lo
Logic Hi
Logic Lo
V
USB
= 5.0V, I
OUT
= 1A, Temperature Rising
I
BAT
= -1A (Not Tested)
V
USB
> V
BAT
+ V
CHG
V
USB
< V
BAT
+ V
DCH
Charge–to–discharge or Discharge–to–charge
V
USB
< V
BAT
, I
PSW
= 0, V
BAT
= 4.2V
V
USB
> V
BAT
, I
PSW
= 0
C
PSW
= 1000pF, to V
PSW
= (V
BAT
– 1V)
VDD – VBAT, I
BATT
= 5mA; not tested in
production
VBAT – VDD, I
BATT
= -20mA; not tested in
production
2.0
0.8
130
140
130
40
60
5
4.1
5
0
4.2
0
10
500
65
65
150
150
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
ORing Resistance
R
PSW
Switch Delay (after tsw)
t
PSW
HEAD ROOM
Charging headroom
Discharging headroom
10
E
LECTRICALS
E
LECTRICALS
0.2
15
1000
Copyright
©
2004
Rev. 1.0a, 2006-02-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2202
TM
®
2A Li-Ion Linear Charger and Power Control
P
RODUCTION
D
ATA
S
HEET
SIMPLIFIED BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
UVLO
VID0
PSW
VDD
CHARGE/
DISCHARGE
CONTROL
0.1
STAT
USB
BAT
CHARGE
TERMINATION
CONTROL
CUS
VID1
USB
LIMIT
CONTROL
CTP
VM
CONSTANT
VOLTAGE
CONTROL
CMP
TEMPERATURE
CONTROL
CCP
CONSTANT
CURRENT
CONTROL
GND
Figure 1 –
Simplified Block Diagram
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
Copyright
©
2004
Rev. 1.0a, 2006-02-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2202
TM
®
2A Li-Ion Linear Charger and Power Control
P
RODUCTION
D
ATA
S
HEET
APPLICATION CIRCUITS
WWW .
Microsemi
.C
OM
LX 2202 C O N T R O L F LO W D IA G R A M
START
R E T U R N T O S T A R T IF
V S Y S > V B A T, U V LO O R E N C H A N G E
STATE.
U V LO
NO
YES
V
SYS
>
V
BAT
YES
NO
V ID 0 = 1
YES
NO
V ID 1= 1
YES
NO
EN = HI
NO
NO
S W ITC H O F F
V
B A T
> 60%
YES
C O N D IT IO N
CHARGE
MODE
YES
D IS C H A R G E
MODE
CONSTANT CURRENT
CHARGE MODE
U S B P R O G D E TE R M IN E D
B Y T H E S T A T E O F V ID 1.
TEM P <
140
YES
NO
TEM P <
140
YES
NO
REDUCE
CHARGE
CURRENT
REDUCE
CHARGE
CURRENT
I
U S B <
PROG
NO
NO
I
U S B <
PROG
YES
REDUCE
CHARGE
CURRENT
NO
REDUCE
CHARGE
CURRENT
YES
I
B A T
< I
M IN
YES
NO
V
BAT
> V
CV
YES
V O LT A G E
M O N IT O R IN G
M O D E (S T A T E ).
C O N S T A N T V O LT A G E
CHARGE MODE
V
B A T
<97%
YES
NO
A
PPLICATIONS
A
PPLICATIONS
RETURN TO THE TOP
OF THE CHART.
Figure 2 –
Control Flow Diagram
Copyright
©
2004
Rev. 1.0a, 2006-02-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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