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LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
DESCRIPTION
KEY FEATURES Up to 1A charge current Low drop out design Reverse leakage protection Linear thermal control loop Pre-charge conditioning Programmable Termination Current Short Circuit protected Small 3x3mm MLP package
APPLICATIONS
The LX2203 is a tiny linear battery charger for Lithium Ion or Lithium Polymer batteries. The LX2203 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.
The LX2203 charges the battery in two phases: constant current and constant voltage. A reduced current conditioning mode is provided for deeply discharged batteries. The LX2203 automatically restarts if the battery voltage falls below the top-off threshold. The LX2203 enters a low quiescent current sleep mode when power is removed.
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IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PDAs, MP3 Players Cell Phones Charging cradles Digital Cameras
PRODUCT HIGHLIGHT
AC/DC Adapter
VIN VIN STAT CTP GND
BAT BAT
LX2203
CMP EN CCP
+
EN 0 1
MODE Sleep mode - charge disabled Charge enabled.
ON/OFF
PACKAGE ORDER INFO
_
LX2203 LX2203
TA (C) -40 to 85
LD
Plastic MLP 10-Pin
RoHS Compliant / Pb-free
LX2203CLD
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX2203CLD-TR)
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS 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 150C Storage Temperature Range.........................................................................-65C to 150C
RoHS / Pb-free Peak Package Solder Reflow Temp(40 seconds max. exposure) ............260C (+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.
PACKAGE PIN OUT
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VIN VIN STAT CTP GND
1
10
BAT BAT CMP EN CCP
2
9
3
8
4
Connect Bottom to Power GND
7
5
6
THERMAL DATA
LD PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
LD
Plastic Micro Leadframe Package 10-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
49C/W
Junction Temperature Calculation: TJ = TA + (PD x JA). The 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 EN GND STAT VIN 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 (Rccp) is connected between this pin and GND. See application section for programming information. Compensation Pin - Apply a 0.01F capacitor between CMP and VIN pins. Charge Termination Programming Pin - A resistor (Rctp) is connected between this pin and GND See application section for programming information. Enable - Applying a TTL compatible Hi signal enables the charger, a Low signal disables the charger and puts it in sleep mode. Common Ground. Status - This pin is a logic low level when the battery is being charged. Pin can sink up to 5mA.
PACKAGE DATA PACKAGE DATA
Voltage Input - Supply Voltage. Must be greater than VBAT to charge.
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
Unless otherwise specified, the following specifications apply over the ambient temperature 0C TA noted and the following test conditions: VVIN = 5V, VBAT =3.8V, Rccp = 90.9k, Rctp = 150k. Parameter
MAIN CIRCUITRY Input Voltage Quiescent Current CTP Bias Voltage CCP Bias Voltage CONSTANT VOLTAGE MODE BAT Output Voltage Top Off Charge Droop Threshold Charge Termination Taper Current CONSTANT CURRENT MODE BAT Constant Current Conditioning Current Conditioning Current Mode Threshold Voltage LOGIC STAT Logic High Output STAT Logic Low Output EN Select Threshold EN bias current THERMAL SHUTDOWN Maximum Junction Temperature PASS ELEMENT Reverse mode current UNDER VOLTAGE LOCKOUT Rising Threshold Voltage Falling Threshold Voltage VUVLO+ VUVLO-IBAT VVIN < VBAT TJ VSTAT VSTAT VEN IEN ISTAT = -100uA ISTAT = 5mA Logic Hi Logic Lo VEN = Hi ICOND VBAT(COND) VBAT < VBAT(COND) VBAT(COND) /VBAT(MAX) VBAT(MAX) VDRP VDRP /VBAT(MAX) VBAT = VBAT(MAX) VVIN IGND VCTP VCCP VEN = Hi VEN = Lo
ELECTRICAL CHARACTERISTICS
70C except where otherwise
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Symbol
Test Conditions
Min
4.35
LX2203 Typ
Max
6
Units
V mA A V V
3 7 1.25 1.25
5
4.16 96 42
4.2 97 51
4.24 98 60
V % mA
0.9 4% 60
1.0 5% 63
1.1 6% 66
A
ICOND IBAT
%
4.5 0.5 2.0 0.8 8
V V
A C
150
5
A
4.2 3.9
V V
ELECTRICALS ELECTRICALS
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
CHARGING PROFILE
4.5
CHARGE CURRENT PROGRAMMING
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Charge Voltage And Current
4.0
1200
Charge Current (mA)
3.5 Voltage 3.0 2.5 2.0 1.5 1.0 Current
1000 800 600 400 200 0
0.5 0 0 0.5 1.0 1.5 2.0 2.5
0
4.0
8.0
12.0
16.0
Iccp Current (A)
Constant Charge Current Programming CHARGE VOLTAGE DISTRIBUTION
300
Charge Time (hours)
TERMINATION CURRENT PROGRAMMING
800
250 200
Termination Current (mA)
600
COUT
0 20 40 60 80 100
150 100
400
200
50
0
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
1/Rctp (micromhos)
Termination Current Programming
V
Post Trim Bat Volt 1.0A CHARGE CURRENT DISTRIBUTION
70 60
50MA TERMINATION DISTRIBUTION
1400 1200 1000 Count
50
Count
40
800 600
30
CHARTS CHARTS
20
400
10
200
0 -996.327E-03 -989.388E-03 -982.449E-03 -975.510E-03 -968.571E-03 -961.633E-03 -954.694E-03 -947.755E-03 -940.816E-03 -933.878E-03 -926.939E-03 -920.000E-03 -1.087 -1.080 -1.073 -1.066 -1.059 -1.052 -1.045 -1.038 -1.031 -1.024 -1.017 -1.010 -1.003
0 -60 -56 -52 -48 -44 -40 -36 -32 -28 -24 -20 More
A
Charge Current Post Trim
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
mA
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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+ EN ENABLE
UVLO
VDD
STAT CHARGE CONTROL BAT
CHARGE TERMINATION CONTROL
CTP
CMP
CONSTANT VOLTAGE CONTROL
TEMPERATURE CONTROL
CCP
CONSTANT CURRENT CONTROL
GND
BLOCK DIAGRAM BLOCK DIAGRAM
Figure 1 - Simplified Block Diagram
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
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
YES
NO
SLEEP
VIN> VUVLO
YES
NO
VIN> VBAT
YES
NO
CONSTANT VOLTAGE CHARGE MODE
NO
VBAT>60%
YES
CONDITION CHARGE MODE
TEMP <
150
YES
NO
REDUCE CHARGE CURRENT
CONSTANT CURRENT CHARGE MODE
NO
IBATYES
TEMP <
150
YES
NO
REDUCE CHARGE CURRENT
VOLTAGE MONITORING MODE (STATE).
A APPLICATIONS
NO
VBAT> VCV
YES
VBAT<97%
YES
NO
RETURN TO THE TOP OF THE CHART.
Figure 2 - Control Flow Diagram
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
TYPICAL APPLICATIONS
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AC/DC Adapter
VIN VIN STAT CTP
BAT BAT
0.01uF
LX2203
CMP EN CCP
+
_
2.7k
GND
150k
90.9k
ON/OFF
Figure 3 -Basic charger from Wall Adapter with 1A constant current and 50mA termination current
Input Power
VIN VIN STAT CTP
2.7k
BAT BAT
0.01uF
EN CCP
165k 243k 1.21M
GND
150k
ON/OFF
CP1 CP2
BSS138DW-7
IBAT 100mA 500mA 1.0A
CP1 L L H
CP2 L H H
_
LX2203
+
CMP
APPLICATIONS APPLICATIONS
Figure 4 - Wall adapter and USB Charger (1A, 500mA, 100mA, selectable)
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION NOTE
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GENERAL DESCRIPTION The LX2203 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. 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 150C. 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 a 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
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 LX2203 to place included in this specification. The CCP pin is regulated to 10F 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 LX2203 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.
APPLICATIONS APPLICATIONS
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION NOTE (CONTINUED)
CONSTANT CHARGE CURRENT PROGRAMMING (CONTINUED) The table below lists some popular Constant Current Settings along with the associated CCP pin current and programming resistor:
Charge Current 1.0A 500mA 100mA Iccp Current 13.75A 6.22A 1.00A Rccp Value 90.9K 200K 1200K
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CCP
Vcc 500mA/100mA R2 R1 1.21M
CCP
Rsw 243k 1.21M
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.
500mA/100mA
Figure 6 - Circuits to provide 100mA and 500mA constant charge currents. The values of R1 and R2 are selected such that:
VCC x
R2 R1 x R 2 = 1.25 & = R SW R1 + R 2 R1 + R 2
Solving these equations:
R1 =
VCC x R SW R x 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 0.01uF is required between the CMP pin and VIN.
A APPLICATIONS
Copyright (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
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LD
10-Pin Plastic MLP Dual Exposed Pad
D e L
E
E2
Top View
b D2
Bottom View
A A3 A1
Dim A A1 A3 b D D2 e E E2 L
Note:
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
MECHANICALS MECHANICALS
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 (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
LX2203
TM (R)
Li-Ion Battery Charger
PRODUCTION DATA SHEET
NOTES
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NOTES 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 (c) 2004 Rev. 1.0a, 2005-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11

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