Microsemi LX2203A Li-ion battery charger Datasheet

LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
KEY FEATURES
DESCRIPTION
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
Up to 1A Charge Current
Low Drop Out Design
Reverse Leakage Protection
Linear Thermal Control Loop
Pre-Charge Conditioning
Programmable Termination
Current
ƒ Short Circuit Protected
ƒ Small 3x3mm MLP Package
The LX2203A charges the battery in
two phases: constant current and
constant voltage. A reduced current
conditioning mode is provided for
deeply discharged batteries.
The
LX2203A automatically restarts if the
battery voltage falls below the top-off
threshold. The LX2203A enters a low
quiescent current sleep mode when
power is removed.
The
LX2203A
is
backward
compatible with the LX2203. The
difference is the LX2203A can
terminate charging while using CCP
resistors ranging from 90k to 1.5M and
the LX2203 from 90k to 400k.
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The Microsemi LX2203A is a tiny
linear battery charger for Lithium Ion
or Lithium Polymer batteries. The
LX2203A includes built in MOSFET,
accurate current and voltage regulation,
reverse blocking protection, over
temperature control, and charge status
indicator. The accurate programmable
charge current and independent
termination current programming
make it easy to logically reprogram
the charge current limit at any time.
APPLICATIONS
ƒ
ƒ
ƒ
ƒ
PDAs, MP3 Players
Cell Phones
Charging Cradles
Digital Cameras
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
AC/DC Adapter
VIN
BAT
VIN
BAT
STAT LX2203A CMP
EN
GND
CCP
+
_
CTP
EN
0
1
MODE
Sleep mode – charge disabled
Charge enabled.
ON/OFF
PACKAGE ORDER INFO
LD
Plastic MLP
10-Pin
LX2203A
TA (°C)
RoHS Compliant / Pb-free
-40 to 85
LX2203AILD
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e.
LX2203AILD-TR)
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
Peak Package Solder Reflow Temp(40 seconds max. 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.
VIN
1
10
BAT
VIN
2
9
BAT
STAT
3
8
CMP
CTP
4
7
EN
GND
5
6
CCP
Connect Bottom to
Power GND
LD PACKAGE
THERMAL DATA
(Top View)
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Supply Voltage (VIN)....................................................................................... -0.3V to 7V
Input Signals (SHDN, EN,CMP) ...................................................................... -0.3V to 7V
Battery Charging Current (IBAT)....................................................................................1.2A
Operating Junction Temperature................................................................... -40C to 150°C
Storage Temperature Range.........................................................................-65°C to 150°C
RoHS / Pb-free 100% Matte Tin Lead Finish
LD
Plastic Micro Leadframe Package 10-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
49°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.
FUNCTIONAL PIN DESCRIPTION
Name
Description
BAT
Charging Output - This pin is wired to the positive terminal of the battery. (The negative battery terminal is wired
to GND.)
CCP
Charge Current Programming Pin - A resistor (Rccp) is connected between this pin and GND. See application
section for programming information.
CMP
Compensation Pin – Apply a 0.01µF capacitor between CMP and VIN pins.
CTP
Charge Termination Programming Pin – A resistor (Rctp) is connected between this pin and GND See
application section for programming information.
EN
Enable - Applying a TTL compatible Hi signal enables the charger, a Low signal disables the charger and puts it
in sleep mode.
GND
Common Ground.
STAT
Status - This pin is a logic low level when the battery is being charged. Pin can sink up to 5mA.
PACKAGE DATA
VIN
Voltage Input – Supply Voltage. Must be greater than VBAT to charge.
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS
Parameter
`
`
Test Conditions
Input Voltage
VVIN
Quiescent Current
IGND
Min
LX2203A
Typ
Max
4.35
5
mA
3
VEN = Lo
7
µA
1.25
V
CCP Bias Voltage
VCCP
1.25
V
CONSTANT VOLTAGE MODE
VBAT(MAX)
4.16
4.2
4.24
V
VDRP /VBAT(MAX)
96
97
98
%
Charge Termination Taper Current
VBAT = VBAT(MAX)
42
51
60
mA
Taper Current @ Low Charge Level
VBAT = VBAT(MAX); RCCP = 1.2M
37
48
60
mA
0.9
1.0
1.1
A
VDRP
CONSTANT CURRENT MODE
ICOND
Conditioning Current Mode
Threshold Voltage
VBAT(COND)
VBAT < VBAT(COND)
4%
5%
6%
ICOND
IBAT
VBAT(COND) /VBAT(MAX)
60
63
66
%
4.5
LOGIC
STAT Logic High Output
VSTAT
ISTAT = -100uA
STAT Logic Low Output
VSTAT
ISTAT = 5mA
Logic Hi
EN Select Threshold
V
0.5
V
2.0
VEN
Logic Lo
EN bias current
IEN
VEN = Hi
0.8
8
µA
150
°C
5
µA
THERMAL SHUTDOWN
TJ
ELECTRICALS
Maximum Junction Temperature
PASS ELEMENT
Reverse mode current
`
V
VCTP
Conditioning Current
`
6
VEN = Hi
BAT Constant Current
`
Units
CTP Bias Voltage
Top Off Charge Droop Threshold
`
70°C except where otherwise
MAIN CIRCUITRY
BAT Output Voltage
`
Symbol
≤
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Unless otherwise specified, the following specifications apply over the ambient temperature 0°C ≤ TA
noted and the following test conditions: VVIN = 5V, VBAT =3.8V, RCCP = 90.9k, RCTP = 150k.
-IBAT
VVIN < VBAT
UNDER VOLTAGE LOCKOUT
Rising Threshold Voltage
VUVLO+
4.2
V
Falling Threshold Voltage
VUVLO-
3.9
V
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
CHARGING PROFILE
CHARGE CURRENT PROGRAMMING
Charge Current (mA)
Charge Voltage And Current
1200
4.0
3.5
Voltage
3.0
Current
2.5
2.0
1.5
1000
800
600
400
200
1.0
0
0.5
0
4.0
8.0
0
12.0
16.0
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4.5
Iccp Current (µA)
0
0.5
1.0
1.5
2.0
2.5
Constant Charge Current Programming
Charge Time (hours)
TERMINATION CURRENT PROGRAMMING
CHARGE VOLTAGE DISTRIBUTION
300
250
200
600
COUT
400
150
100
200
50
0
0
20
40
60
80
100
0
4.171
4.174
4.176
4.179
4.181
4.183
4.186
4.188
4.191
4.193
4.196
4.198
4.201
4.203
4.206
4.208
4.210
4.213
4.215
4.218
4.220
4.223
4.225
4.228
4.230
Termination Current (mA)
800
1/Rctp (micromhos)
Termination Current Programming
V
Post Trim Bat Volt
1.0A CHARGE CURRENT DISTRIBUTION
50MA TERMINATION DISTRIBUTION
70
1400
60
1200
50
Count
Count
1000
40
30
800
600
CHARTS
20
400
10
200
More
-20
-24
-28
-32
-36
-40
-44
-48
-52
-56
0
-60
-920.000E-03
-926.939E-03
-933.878E-03
-940.816E-03
-947.755E-03
-954.694E-03
-961.633E-03
-968.571E-03
-975.510E-03
-982.449E-03
-989.388E-03
-1.003
-996.327E-03
-1.010
-1.017
-1.024
-1.031
-1.038
-1.045
-1.052
-1.059
-1.066
-1.073
-1.080
-1.087
0
A
Charge Current Post Trim
Copyright © 2004
Rev. 1.0a, 2005-10-21
mA
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
SIMPLIFIED BLOCK DIAGRAM
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+
EN
ENABLE
UVLO
CHARGE
CONTROL
VDD
STAT
BAT
CHARGE
TERMINATION
CONTROL
CTP
CONSTANT
VOLTAGE
CONTROL
CMP
TEMPERATURE
CONTROL
CONDITIONING
THRESHOLD
CONSTANT
CURRENT
CONTROL
CCP
CONDITION
CURRENT
BLOCK DIAGRAM
GND
LX2203A
Figure 1 – Simplified Block Diagram
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX2203A
®
TM
Li-Ion Battery Charger
P RODUCTION D ATA S HEET
THEORY OF OPERATION
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LX2203 CONTROL FLOW DIAGRAM
Return to START
if EN changes state or
VIN is removed.
START
EN = 1
NO
SLEEP
YES
V IN >
V UVLO
NO
YES
V IN >
V BAT
NO
CONSTANT VOLTAGE
CHARGE MODE
YES
NO
V BAT >60%
CONDITION
CHARGE
MODE
TEMP <
150
NO
REDUCE
CHARGE
CURRENT
YES
YES
CONSTANT CURRENT
CHARGE MODE
NO
I BAT <IMIN
YES
TEMP <
150
NO
REDUCE
CHARGE
CURRENT
APPLICATIONS
VOLTAGE
MONITORING
MODE (STATE).
YES
NO
V BAT <97%
V BAT > V CV
NO
YES
YES
RETURN TO THE TOP
OF THE CHART.
Figure 2 – Control Flow Diagram
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
TYPICAL APPLICATIONS
VIN
BAT
VIN
BAT
STAT LX2203A CMP
EN
GND
CCP
+
_
CTP
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AC/DC Adapter
ON/OFF
Figure 3 –Basic charger from Wall Adapter with 1A constant current and 50mA termination current
Input Power
VIN
BAT
VIN
BAT
+
EN
GND
CCP
_
0.01µF
243K
CTP
165K
2.7K
150K
STAT LX2203A CMP
1.21M
BSS138DW-7
ON/OFF
APPLICATIONS
CP1
CP2
IBAT
100mA
500mA
1.0A
CP1
L
L
H
CP2
L
H
H
Figure 4 – Wall adapter and USB Charger (1A, 500mA, 100mA, selectable)
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX2203A
TM
Li-Ion Battery Charger
®
P RODUCTION D ATA S HEET
APPLICATION NOTE
PROTECTION FEATURES
Conditioning Current Mode – If the battery terminal
voltage is less than 2.65V, 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
damaged battery.
Under Voltage Lockout – The charge cycle will not start
until the VIN voltage rises above 4.2V. Hysteresis prevents
chattering on and off.
Thermal Control loop – If the power dissipation of the
charger becomes excessive, the charge current will be
reduced to prevent the die temperature from getting above
150°C. This does not cause the charge cycle to stop.
Reverse current blocking – If VIN is grounded, current
will not flow from the battery through the charger. No
external blocking diode is required on the input.
Sleep Mode – If the EN pin is logic low or if VIN is
removed, the charger enters a sleep mode where a very low
quiescent current prevents drain from the battery.
TERMINATION CURRENT PROGRAMMING
The charge termination current (or minimum taper
current) is set by selecting a value for the CTP resistor using
the following formula:
R CTP =
7500
I TERM
For example, for a termination current of 50mA set RCTP
= 150k. This formula applies to termination currents
ranging from 20mA to 500mA.
It is possible to change the termination current to different
levels for different charge rates. For a “quick charge”, the
termination current can be set to about 50% of the constant
current level; this charges the battery to about 75% capacity.
For a full charge (taking several hours) the termination
current can be set to 5% of the constant current level. The
circuit below allows switching between the two levels:
CTP
16.5k
150k
Quick/Slow
Figure 5 – 500mA or 50mA termination current
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
APPLICATIONS
CONSTANT CHARGE CURRENT PROGRAMMING
The charge current during the constant current charge
mode
is programmable by controlling the current flowing
LAYOUT GUIDELINES
from the CCP pin. A graph showing this relationship is
• It is important when laying out the LX2203A to place
included in this specification. The CCP pin is regulated to
10µF ceramic capacitors close to the VIN and VBAT IC
1.25V when the charger is active. Connecting a resistor from
terminals to filter switching transients.
the CTP to ground will produce a CTP current of:
• It is important to provide a low thermal impedance
1.25
path from the thermal pad on the bottom of the LX2203A
I CTP =
package to the ground plane of the circuit board to maximize
R CCP
the heat dissipation. To minimize charge time it is best not to
(Continued on next page)
rely on the thermal control feature as this feature will extend
the charging time when activated.
Copyright © 2004
Rev. 1.0a, 2005-10-21
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GENERAL DESCRIPTION
The LX2203A is designed to charge a single cell Lithium
Ion (Li-ion) battery using two modes: a constant current
mode, where the charge current is held constant and the
battery terminal voltage rises to 4.2V; this is followed by
constant voltage mode, where the battery voltage is held at
4.2V and the charge current starts to taper off. Once the taper
current reaches the charge termination current level the
charge cycle is ended and the STAT indicator turns off. If
the fully charged battery terminal voltage drops to 4.07V, the
battery charge cycle will be restarted.
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
APPLICATION NOTE (CONTINUED)
CCP
Vcc
R1
1.21M
500mA/100mA
R2
Charge Current
ICCP Current
RCCP Value
1.0A
13.75µA
90.9K
500mA
6.22µA
200K
100mA
1.00µA
1200K
CCP
Rsw
243k
It is possible to change the constant current setting by
changing the RCCP resistor while in charge mode. Since the
termination current is independent of the charge current,
lowering the constant charge current will increase the charge
time, but will not reduce the stored charge in the battery at
the charge termination point.
The circuit in Figure 4 is an example of a battery charger
configured to charge at 1A, 500mA or 100mA. The switches
are logically controlled and reduce the resistance at the CCP
pin when switched in. It is possible to eliminate the
MOSFET devices if open drain logic is available.
The logic for the CP1 and CP2 would normally come
from the appliance processor which would need to have the
capability to communicate over the USB interface. If there
is only one power connector and the USB interface is active,
the logic could assume the power was coming from the USB
bus and not the wall adapter. If the USB interface is active,
the USB application will know if the appliance has been
enumerated as a high or low load and would set CP1 and
CP2 appropriately.
It is possible to change the current programming circuit to
drive it directly with CMOS logic, but this requires that the
CMOS logic power supply be well regulated (±2%). Each
switch resistor leg in Figure 4 can be replaced with a two
resistor network tied to the output of a CMOS gate.
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CONSTANT CHARGE CURRENT PROGRAMMING
(CONTINUED)
The table below lists some popular Constant Current
Settings along with the associated CCP pin current and
programming resistor:
1.21M
500mA/100mA
Figure 6 – Circuits to provide 100mA and 500mA
constant charge currents.
The values of R1 and R2 are selected such that:
VCC ×
R2
R1 × R 2
= R SW
= 1.25 &
R1 + R 2
R1 + R 2
Solving these equations:
R1 =
VCC × R SW
R × R SW
& R2 = 1
1.25
R 1 − R SW
For VCC = 3.3V and RSW = 243k; R1 = 649k; R2 = 392k.
These values should provide charge currents of 100mA and
500mA.
COMPENSATION CAPACITOR
A compensation capacitor of value 0.01µF is required
between the CMP pin and VIN.
APPLICATIONS
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX2203A
Li-Ion Battery Charger
®
TM
P RODUCTION D ATA S HEET
PACKAGE DIMENSIONS
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LD
10-Pin Plastic MLP Dual Exposed Pad
D
e
L
E
E2
Top View
Bottom
View
b
D2
A
A3
A1
MILLIMETERS
MIN MAX
0.80 1.00
0
0.05
0.20 REF
0.18 0.30
3.00 BSC
2.23 2.48
0.50 BSC
3.00 BSC
1.49 1.74
0.30 0.50
INCHES
MIN
MAX
0.0315 0.0394
0
0.0019
0.0079 REF
0.0071 0.0118
0.1181 BSC
0.0878 0.0976
0.0197 BSC
0.1181 BSC
0.0587 0.0685
0.0071 0.0197
Note:
1.
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.
Copyright © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
MECHANICALS
Dim
A
A1
A3
b
D
D2
e
E
E2
L
LX2203A
TM
Li-Ion Battery Charger
®
P RODUCTION D ATA S HEET
NOTES
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NOTES
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 © 2004
Rev. 1.0a, 2005-10-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
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