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LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
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 RdsON 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
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IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
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
10F
VDD
BAT
Wall Adapter
VDD VDD
LX2202
BAT BAT
VDD > VBAT 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
0.1F 10F 2.55k 105k 72.3k To VDD
1
2.49k
Charge Indicator
1
1
VBAT > VDD Switch open - discharge disabled. Switch open - discharge disabled. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD.
STAT
PACKAGE ORDER INFO
TA(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 (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
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Supply Voltage (VUSB or VDD ) ..........................................................-0.3V to 7V Analog Input Signals (VIDx, VM, SNS) .............................................-0.3V to 7V Battery Charging Current (IBAT).........................................................................2A Discharge Current (IVDD)....................................................................................3A Operating Junction Temperature.................................................................. 150C Storage Temperature Range...........................................................-65C to 150C USB Maximum DC Current .......................................................................500mA USB Maximum Surge Current...........................................................................2A RoHS / Pb-free Peak Package Solder Reflow Temperature (40 second maximum 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.
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
CTP
GND
LQ PACKAGE
THERMAL DATA
RoHS / Pb-free 100% Matte Tin Lead Finish
LQ
Plastic Micro Lead Frame Quad Package 20-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
40C/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
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 0.1F 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 > VBAT. 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 VBAT > VDD, or VID0 = VID1 = 0.
CUS
(Top View)
CCP
PACKAGE DATA PACKAGE DATA
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the ambient temperature 0C TA 70C 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
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Symbol
VDD VUSB VDDUVLO IGND VCTP VCCP VCUS VCVL VDRP ICCL ICOND VCTV IBAT IIN IIN VSTAT VSTAT VVID VVM @25C
Test Conditions
Min
4.5 4.35
LX2202 Typ
Max
6 6 3.85 4 40 15
Units
V V V mA A A V V V V
% VBAT VCVL
VBAT = 0; Rising VDD VDD > VBAT VDD < VBAT VDD < VBAT, VID0 = VID1 = 0V IBAT > 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
% IBAT ICCL
VBAT < VCTV ; @25C
3.0
V 65 100 500 5 0.4 0.8 mA mA mA V V V V C m mV mV s V V K Ns mV mV
VUSB = 5V, VDD < VUSB, VID1 = Lo VUSB = 5V, VDD < VUSB, VID1 = Hi VUSB = 5.0V, ISTAT = -5mA VUSB = 5.0V, ISTAT = 25A Logic Hi Logic Lo Logic Hi Logic Lo VUSB = 5.0V, IOUT = 1A, Temperature Rising IBAT = -1A (Not Tested) VUSB > VBAT + VCHG VUSB < VBAT + VDCH Charge-to-discharge or Discharge-to-charge VUSB < VBAT, IPSW = 0, VBAT = 4.2V VUSB > VBAT, IPSW = 0 CPSW = 1000pF, to VPSW = (VBAT - 1V) VDD - VBAT, IBATT = 5mA; not tested in production VBAT - VDD, IBATT = -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 TJ BI-DIRECTIONAL PASS ELEMENT CONTROL Discharge Switch On Resistance RDS(ON) Charging Threshold VCHG Discharging Threshold VDCH Pass Element Switch Mode Delay tsw PSW FET DRIVER High Output Voltage VPSW Low Output Voltage VPSW ORing Resistance RPSW Switch Delay (after tsw) tPSW HEAD ROOM Charging headroom Discharging headroom
10
ELECTRICALS ELECTRICALS
0.2 15 1000
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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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
BLOCK DIAGRAM BLOCK DIAGRAM
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
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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
VSYS
>
VBAT
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
IUSB < PROG
NO
NO
IU S B < PROG
YES
REDUCE CHARGE CURRENT
NO
REDUCE CHARGE CURRENT
YES
IBAT< IM IN
YES
NO
VBAT> 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
APPLICATIONS APPLICATIONS
RETURN TO THE TOP OF THE CHART.
Figure 2 - Control Flow Diagram
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
APPLICATION SCHEMATICS
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USB Lo / Hi
VM
VID0
VID1
PSW
NU
To System Power Bus
VDD
NU 10F
VDD B220 AC/DC Adapter VDD
BAT
VDD
LX2202
STAT
BAT
BAT
1N4148 1N5817
USB
CMP
GND
USB POWER IRLMS6802
2.55k
CUS
CCP
CTP 105k
0.1F 72.3k
10F
Charge Indicator
2.49k
State Select Truth Table
VID0 0 0 1 VID1 0 1 0 VDD > VBAT 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. VBAT > VDD Switch open - discharge disabled. Switch open - discharge disabled. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD.
1
1
APPLICATIONS APPLICATIONS
Figure 3 - AC Adapter and USB Supply (Charge and Discharge Modes) (1N4148 and IRLMS6802 are optional to lower USB voltage drop.)
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
CHARGING CURRENT ACCURACY OVER T E M P
Normalized Current Accuracy (%)
101.5
TERMINATION CURRENT OVER TEMP
54
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Termination Current (mA)
101 100.5 100 99.5 99 98.5 98 -55 -35 -15 5 25 45 65 85
52 50 48 46 44 42 40 -55 -35 -15 5 25 45 65 85
Ambient Temperature (C)
Am bient Tem perature (C)
CONSTANT CURRENT PROGRAMMING
2500
TERMINATION CURRENT VS CTP CONDUCTANCE
600
2000
Termination Current (in mA)
5.00 10.00 15.00 20.00 25.00 30.00 35.00
Constant Charge Current (mA)
500 400 300 200 100 0 0.0 20.0 40.0 60.0 80.0 100.0 120.0
1500
1000
500
0 0.00
CCP Current (uA)
CTP Conductance (in micromhos)
CHARGING CURRENT OVER VDD VOLTAGE
1200 Charge Current (in mA) 1000 800 600 400 200 0 3 3.5 Battery Voltage 4 4.5
DISCHARGE MODE DYNAMIC RESPONSE
C CHARTS
VDD = 4.3V VDD = 4.5V VDD = 5.0V VDD = 5.5V
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
CHARGING PROFILE
5 1000
DISCHARGE VOLTAGE DROP
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250
4 Battery Voltage Stat Voltage 800
3
600
Voltage Drop (in mV)
Battery Current (mA)
200 150 100 50 0
2
400
1
200
0
0
50 100 150 200 250 T im e (in m in u te s )
500
1000 Discharge Current
1500
2000
HEADROOM CONTROL
Headroom vs Battery Current
80 Vdd - Vbat (in mV) 60 40 20 0 -20 -40 -60 -80 -100 -50 0 50 100
Current Flow Into Battery (mA)
C CHARTS
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
THEORY OF OPERATION GENERAL DESCRIPTION TOP OFF CHARGE MODE
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The LX2202 is designed to charge a single cell Lithium Ion battery using two steps: a constant current step followed by a constant voltage step. The basic charger function uses the VDD pins as an input and BAT pins as the output. The LX2202 charger has a programmable maximum current (programmable by the resistor value between pin CCP to GND) which is the maximum charging current during the Constant Current Mode of the charging profile. The low dropout of the pass element allows the battery to be charged from a loosely regulated power supply. In the Constant Voltage Mode, the battery terminal voltage can be regulated to 4.1V or 4.2V by strapping the VM pin to VDD or GND, respectively. The charger will terminate constant voltage charging once the current drops below the minimum current setting (programmable by the resistor value between pin CTP to GND). The LX2202 has an integrated thermostat with a linear thermal regulation loop that will throttle back the charging current to prevent the internal die temperature from exceeding 150C. This feature prevents damage to the system board when the IC exceeds its thermal temperature.
CURRENT CHARGE MODE
Once the charger has completed a charge cycle, if power remains applied, the LX2202 enters a Voltage Monitoring mode. In this mode the LX2202 monitors the battery terminal voltage and applies a top off charge if the battery voltage drops by more than 3% of full scale. This feature is especially important for charging systems in equipment where usage is infrequent.
USB CHARGE MODE
The LX2202 is fully compliant with, and supports, the USB specifications - the Low Power Peripheral (100mA) and High Power Peripherals (500mA). VID1 logic input selects USB charge currents. The LX2202 senses the current flowing from the USB terminal to the VDD terminal; then it limits the USB current by reducing the current flowing from VDD to VBAT.
DISCHARGE 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 CCP programmable constant current level (except where it might be limited in the USB states). Once the battery terminal voltage exceeds the 60% level, the full constant current level is applied (unless charging current is limited by one of the other charger control loops).
CHARGE TERMINATION MODE
VID0 is used to enable discharge mode enable. The system load is connected to VDD. The input power is connected to VDD through an external diode. When the input power is removed, the battery current flows from VBAT to VDD. The circuit of Figure 3 shows the LX2202 in a discharge mode configuration with both AC adapter and USB inputs. The USB input is diode ORed to the VDD pin and uses a MOSFET to reduce the diode drop across the ORing diode. The LX2202 provides a signal "PSW" to control the MOSFET for charge and discharge modes. When both AC and USB power are applied the PSW signal is overridden by the AC adapter diode and the MOSFET is turned off
UNDER VOLTAGE LOCK OUT
To increase system battery life and avoid float charging, the LX2202 turns off the pass element once the battery has been fully charged. The charge termination state occurs at the end of constant voltage mode. The charge status changes state when charging is completed.
The LX2202 has an under voltage lock-out feature that monitors the VDD terminal and prevents the battery charger from entering charge mode if the VDD terminal is less than 3.6V (nominal).
APPLICATIONS APPLICATIONS
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
APPLICATION NOTE REDUCED USB CHARGE TIME USB COMPLIANCE
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The LX2202 has an isolated battery topology which reduces charge time from USB when the appliance is turned on while also charging. Because the system power rail can be a higher voltage than the battery voltage, the system will require less power from the USB source which leaves more power available to charge the battery which charges the battery faster. For example, if the system draws 1W, and the USB input is 5V, the system draws 1W/5V = 200mA from the USB source; this leaves 300mA to charge the battery. In a topology where the load connects directly to the battery (as is done with conventional linear chargers), if the average battery voltage is 3.7V, the system will draw 1W/3.7V = 270mA from the USB source, this leaves only 230mA to charge the battery. In this case the LX2202 will charge the battery 30% faster.
CURRENT LIMITED POWER SUPPLIES
To be compliant with the USB specification, the +5V current must be less than 100mA in the low power mode and less than 500mA in the high power mode. If the LX2202 is configured as shown in Figure 3, it is possible for the system to consume more than the maximum allowed USB current (in which case the battery charging current will have been fully scaled back). If it is not possible to regulate the load current when charging from a USB power source and strict adherence to the USB power budget is required, in this case the system load can be applied directly across the battery and the LX2202 will prevent the combination of the load plus battery from drawing more power than is allowed for USB compliance.
LAYOUT GUIDELINES
*
The LX2202 has special headroom voltage regulation circuitry that allows charging from current limited power sources. The LX2202 increases the impedance of the pass element under small charge or discharge currents so that mode change situations can be more readily detected by the internal circuits. This improved mode discrimination allows the battery to aid the current limited input power supply when the system load demands it and to switch back to charge mode when the system power demand is reduced.
It is important when laying out the LX2202 to place 10F ceramic capacitors close to the VDD and VBAT IC terminals to filter switching transients. It is important to provide a low thermal impedance path from the thermal pad on the bottom of the LX2202 package to the ground plane of the circuit board to maximize the heat dissipation.
*
APPLICATIONS APPLICATIONS
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
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LQ
20-Pin MLPQ Plastic 4x4mm (114x114DAP)
D
b L D2
E
E2 e A1 A3 A
Dim A A1 A3 b D D2 E E2 e L
MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 REF 0.18 0.30 4.00 BSC 2.59 2.79 4.00 BSC 2.59 2.79 0.50 BSC 0.30 0.50
INCHES MIN MAX 0.031 0.039 0.000 0.002 0.008 REF 0.007 0.088 0.157 BSC 0.102 0.110 0.157 BSC 0.102 0.110 0.019 BSC 0.011 0.019
M MECHANICALS
Copyright (c) 2004 Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
LX2202
TM (R)
2A Li-Ion Linear Charger and Power Control
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. 1.0, 2005-03-18
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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