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LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
KEY FEATURES Three charge levels for adapter, and USB Hi and Low 0.5% Float voltage tolerance Charging up to 1A. Charging from USB port. USB current compliance Full battery Indicator CC/CV w thermal Feedback Battery temp monitor Precision charge termination Power Good Indication
APPLICATIONS
DESCRIPTION
The LX2207 can use a wall adapter or USB power source to charge a single cell Lithium Ion or Lithium Polymer battery. There are three logic selectable and programmable charge current levels: the high charge programming level is typically set for charging from the adapter, the low level charge programming level is typically set to 500mA for USB full USB charging and 100mA (20%) for reduced level USB charging. In addition to setting the high-level charge current, the HCP programming resistor also sets the termination current at 10% of the constant current level and the conditioning current at 5% of the constant current level. Power status indicators (STAT and DCOK) can be configured to show
charge in progress, battery fully charged and external power on. The STAT pin is capable of sourcing or sinking 10mA. The DCOK output is an open drain output and can sink 20mA. The LX2207 enters a low quiescent current sleep mode when power is removed or when it is logically shutdown to minimize battery drain. There are several protection features which include: under voltage lock out, reverse current blocking on the IN pin, a thermal loop to reduce charge current to maintain a low die temperature, an unsafe battery temperature charge inhibitor, and conditioning mode is provided for deeply discharged batteries.
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MP3 player PDA PMC Digital Camera Charge Cradle
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
LX2207 LX2207
PACKAGE ORDER INFO
TA (C) -40 to 85
LD
Plastic MLPD 12-Pin
RoHS Compliant / Pb-free
LX2207ILD
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX2207ILD-TR)
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
PACKAGE PIN OUT
ABSOLUTE MAXIMUM RATINGS Supply Input Voltage (IN, BAT) ...................................................................... -0.3V to 7V All other pins ............................................................................................-0.3V to VSUPPLY Battery Charging Current .............................................................................................1.1A Operating Temperature Range .........................................................................-40 to 150C Maximum Operating Junction Temperature .............................................................. 150C Storage Temperature Range.........................................................................-65C to 150C Peak Temp. for Solder Reflow (40 seconds 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.
IN CMP STAT DCOK SD 20%
1 2 3 4 5 6
12 11 10 9 8 7
BAT
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TMP HCP LCP H/L GND
THERMAL DATA
LD Package
(Top View)
LD
Plastic Micro Leadframe Package 12-Pin 49C/W
RoHS / Pb-free 100% matte Tin Lead Finish
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
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 CMP
DCOK
Pin # 12 2 4 7 10
Description Battery - Connect to a single cell Lithium Ion Battery. Compensation - Connect a series combination of a 1k resistor and a 0.47F capacitor from CMP to IN. Power status logic pin and LED driver - This pin is an open drain output that can sink 20mA of current to drive an external LED. This pin is low impedance to GND when the Input voltage is high enough to charge the Battery. Ground - Connect to the system ground. High Current Programming (and Termination Current Programming) - Connect a resistor to ground to set the constant current high level. The termination current is set to 1/10 of the High Current Programming Level. For a value of 19.6k, the High Current is 460mA and the Termination Current is 46mA.
GND HCP H/ L
8 1 9 5 3
High or Low load select logic input - A logic high selects the constant charge current level set by the HCP pin resistor and a logic low selects the constant charge current level set by the LCP pin resistor Input Power - Connect to a wall adapter or a USB power plug. Low Current Programming - Connect a resistor to ground to set the constant current low level. For a value of 19.6k, the High Current is 460mA and the 20% current is 92mA. Shutdown - A logic high places the LX2207 in sleep mode; can also be used for USB suspend. Charging status logic pin and LED driver - This pin can source or sink 10mA of current to drive an external LED in either output state. This pin is low (current sinking mode) when the battery is in charging mode and becomes high (current sourcing mode) when the charge cycle is finished. It becomes high impedance when the input power is removed. Battery Temperature Monitor - This sense pin determines the battery temperature for charging out of temperature range lockout and is connected to a resistor network as defined in the Applications section. The TMP pin is grounded if this function is not used. 20% select logic input - When the low current level is selected by the H/L pin, a logic high on 20% selects the constant charge current level set by the LCP pin resistor and a logic low selects 20% of this value.
IN LCP SD STAT
PACKAGE DATA PACKAGE DATA
TMP
20%
11 6
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
The following specifications apply over the operating ambient temperature -40C TA 85C except where otherwise noted and the following test conditions:. IN = 5.0V; SD = Low; H/L = High, 20% = High; BAT = 3.6V; HCP =12.1k, LCP=19.6k; TMP = 0V. LX2207 Parameter Symbol Test Conditions Units Min Typ Max
INPUT CIRCUITRY Input Voltage Battery Voltage Under Voltage Charging Lockout UVLO Hysteresis Input Supply Current BATTERY CHARGER Constant Voltage Charging Constant Voltage Charging HCP Bias Voltage LCP Bias Voltage Max Battery Charge Current Conditioning Current Conditioning Current Conditioning Current Threshold Charge Termination Current Charge Termination Current Charge Termination Current Top Off Charge Droop Threshold Battery Drain Current LOGIC STAT Logic High Output STAT Logic Low Output Input Logic : SD, H/L, 20% Input Current : SD, H/L Input Current : 20% Output Logic : DCOK BATTERY TEMPERATURE MONITOR Cold Temp Fault Threshold Hot Temp Fault Threshold TFB Disable Voltage Temp Loop Regulation VCOLD VHOT VDIS Rising Threshold Falling Threshold Falling Threshold Rising Threshold 75 130 0.75 x VIN 0.72 x VIN 0.28 x VIN 0.30 x VIN 100 140 V V V V mV C VIN VBAT VIN UVLO IIN VBAT VBAT VHCP VLCP IBAT IBAT ICOND VBAT IBAT IBAT IBAT VBAT IBAT VBAT = 4.2V; battery charged VBAT > VIN SD = High (Shutdown Mode) VIN = 5.0V, IDRV = -10mA VIN = 5.0V, IDRV = 10mA Logic Hi, Logic Lo Logic Hi, VLOG = 2V Logic Lo, VLOG = 0V Logic Hi, VLOG = 2V Logic Lo, VLOG = 0V Logic Hi, ILOG = 10k pullup to 3.3V Logic Lo, ILOG = 20mA 4.2 1.2 0 -2 -2 -2 3.1 2 0 -0.8 -0.8 0.4 4 2 2 2 0.5 Rising input VBAT = 3.2V VBAT = 4.2V; battery charged SHDN = High IBAT < 100mA IBAT < 100mA @ 25C IBAT > 100mA HCP=12.1k H/L = Low H/L = Low, 20% = Low VBAT < VCCT VBAT < VCCT; HCP = 110k Rising Battery Voltage HCP = 19.6k HCP = 110k HCP = 210k 4.16 4.18 4.35 3.5 3.8 300 1 35 4.2 4.2 1.25 1.25 710 460 92 23 4.6 2.7 46 9 5 97 1 5 1 4.5 6 4.3 4 2 50 4.24 4.22 V V V mV mA A V V V V mA mA mA mA mA V mA mA mA
% VBAT VCVL
ELECTRICAL CHARACTERISTICS
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665 430 84 13 2.6 2.5 34
772 495 97 33 7.8 2.9 59
96
98 30 30 5 5 0.5
A A A V V V A uA V
VSTAT VSTAT VLOG(IN) ILOG(IN) I20%(IN) VLOG(OUT)
E ELECTRICALS
150 150
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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+ SD ENABLE DCOK
UVLO TMP CHARGE CONTROL STAT
IN
BAT
CONSTANT VOLTAGE CONTROL
CHARGE TERMINATION CONTROL
TEMPERATURE CONTROL
CONDITIONING THRESHOLD
H/L
20%
COND. CURRENT
LCP
LOW CHARGING CURRENT
B D BLOCK DIAGRAM
HCP
HIGH CHARGING CURRENT
GND
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
CONTROL LOGIC DIAGRAM
START
RETURN TO START IF VIN > VBAT, UVLO, SD, CHANGE STATE.
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SD
NO
YES
VIN > VBAT
YES
NO
SLEEP
UVLO
NO
YES
VOLTAGE MONITORING MODE (STATE).
VBAT<97%
YES
NO
VBAT>60%
YES
NO
CONDITION CHARGE MODE
CONSTANT VOLTAGE CHARGE MODE
CONSTANT CURRENT CHARGE MODE
IMAX DETERMINED BY THE STATE OF H/L, RHCP, RLCP and 20%. TEMP < 140 YES NO
REDUCE CHARGE CURRENT
TEMP < 140 YES
NO
REDUCE CHARGE CURRENT
ICC< IMAX
YES
NO
REDUCE CHARGE CURRENT
ICC < IMAX
YES
NO
REDUCE CHARGE CURRENT
NO
IBATYES
ITAPER DETERMINED BY RHCP.
APPLICATIONS APPLICATIONS
NO
VBAT> VCV
YES
RETURN TO THE TOP OF THE CHART.
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
Status 2.49k Adapter or USB Power Pin 10k Grounded Pin in USB cable. Leave open in Adapter Cable. Shutdown USB Hi/Low Control Logic 12.1k Current Programming 1k 0.47u IN CMP H/L SD 20% HCP LCP 19.6k GND Battery STAT 2.49k 2.49k Charging Full Power On 121k 24.9k Battery Temperature Lockout Sensing
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LX2207
DCOK TMP BAT
Figure 1 - Typical Application - 750mA adapter charge current and 500mA or 100mA maximum USB charge currents. A grounded spare pin in the USB power cable can be used to sense when the 500mA USB current power source is being used. This application also uses three LED indicators for Power attached, Battery Charging and Battery full. This configuration also implements circuitry to lockout battery charging if the battery is less than 0C or greater than 60C.
APPLICATIONS APPLICATIONS
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
THEORY OF OPERATION GENERAL DESCRIPTION
The LX2207 charges a single cell Lithium Ion battery using two steps: a constant current mode followed by a constant voltage mode. The maximum charging current during the Constant Current Mode of the charging profile can be logically set (using H/L) to two preprogrammed levels set by resistors connected to HCP and LCP (High and Low current). A 20% logic input selects either the full current set by the LCP resistor or 20% of that value. The charger will terminate constant voltage charging once the current drops below the taper current setting, which is 10% of the high charge current setting (determined by HCP resistor value).
CONDITIONING CURRENT CHARGE MODE
USB CHARGE MODE AND CURRENT LIMIT
The LX2207 is fully compliant with, and supports, the USB specifications - the Low Power Peripheral (100mA) and High Power Peripherals (500mA). USB current levels can be set using the appropriate values for the LCP programming resistor. 20% logic input selects USB high/low charge currents. When the SD pin is pulled high, the USB input enters Suspend mode and will not present a load to the IN pin.
DCOK
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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 HCP programmable constant current level. Once the battery terminal voltage exceeds the conditioning current threshold, the full constant current level is applied (unless one of the other charger control loops limits charging current).
CHARGE TERMINATION MODE
The IN input is monitored and DCOK is set to a logic low to report the presence of the power source with sufficient voltage to charge the battery. The DCOK threshold is the larger of the UVLO threshold or the battery voltage. PROTECTION FEATURES Conditioning Current Mode - If the battery terminal voltage is less than 2.7V, 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 short circuited battery. Under Voltage Lockout - The charge cycle will not start until the IN voltage rises above 3.8V. Hysteresis helps alleviate 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 140C. This does not cause the charge cycle to stop. Reverse current blocking - If IN input is grounded, current will not flow from the BAT pin through the charger. No external blocking diode is required on the input. Sleep Mode - If the SD pin is a logic high, the charger enters a sleep mode where a very low quiescent current prevents drain from the battery.
To increase system battery life and avoid float charging, the LX2207 turns off the pass element once the battery is fully charged. The charge termination state occurs at the end of constant voltage mode. The value of the resistor connected to the HCP programming pin sets the termination current. The STAT pin changes state when charge cycle has completed.
TOP OFF CHARGE MODE
Once the charger has completed a charge cycle, if power remains applied, the LX2207 enters a Voltage Monitoring mode. In this mode the LX2207 monitors the battery terminal voltage and applies a top off charge if the battery voltage drops below the top of threshold.
ADAPTER OR USB SELECTION
The LX2207 supports battery charging from a system that provides adapter power or USB power using the same external connector. Figure 1 shows one example of a system using a special USB adapter cable to determine whether the power source is USB or Wall Adapter. Similarly, if the system processor senses the absence of USB data, it can logically set the H/L logic level high for the wall adapter.
APPLICATIONS APPLICATIONS
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION NOTE
LAYOUT In the layout of the Printed Circuit Board (PCB) it is important to provide a solid path from the IC power and ground pins to the power and ground planes of the PCB to provide a good conduction path for heat. This insures the LX2207 stays cool and can provide the maximum charge current to minimize the time required to charge the battery. For stability, and to reduce turn on - turn off transients, it is important to place capacitors close to the IN and BAT pins. Use a 10uF capacitor (X5R or X7R dielectric) for this purpose. The CMP pin resistor and capacitor should be located close to the CMP pin. The CMP pin is located next to the IN pin to facilitate this. The 1K resistor is not required for stability, but reduces the inrush current into the CMP pin when the IN voltage transient is applied. CURRENT PROGRAMMING RESISTORS The LX2207 has two programming resistors to control the battery charging current during the constant current charging mode of the battery charging cycle. When the H/L pin is high (selecting the High Current charging mode), the charge current is determined by the value of the HCP programming resistor. The maximum charge current is determined by the programming current at either the HCP or LCP programming pins (depending on the state of H/L); the range of each of these channels is identical. The programming current is the HCP or LCP pin voltage (typically 1.25V) divided by the value of the programming resistor. For example, the HCP current with a 110k resistor to GND is:
IHCP = 1.25 1.25 = = 11.4A RHCP 110k
Using the table below it can be seen that for a programming current value of 11.4A, the corresponding maximum charge current is 92mA. The termination current determines the point at which the charge cycle is terminated and the battery is determined to be fully charged. The termination current is determined by the value of the HCP programming current as determined by the HCP programming resistor. For a value of IHCP = 11.4A (as was used in the previous example), the termination current from the chart below can be seen to be 9mA.
Term ination Current vs IHCP 120 Termination Current (in mA) 100 80 60 40 20 0 0.00
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50.00
100.00
150.00
IHCP (in uA)
The termination current is always roughly 10% of the maximum charge current set by the HCP resistor. INDEPENDENT TERMINATION CURRENT PROGRAMMING For applications where a termination current other than 10% is required, the termination current can be set using the HCP resistor and the charge current can be set using the LCP resistor. In this case, the H/L pin is held low so that the HCP charge mode is never utilized. In this way the HCP pin only programs the termination current and conditioning current.
Charge Current vs IHCP (or ILCP)
1200 1000 800 600 400 200 0 0.00
Charge Current (in mA)
APPLICATIONS APPLICATIONS
50.00
100.00
150.00
IHCP (in uA)
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION NOTE
BATTERY TEMPERATURE MONITOR The LX2207 has an input to monitor the battery temperature during battery charging; this method assumes the battery pack contains a thermistor expressly for this purpose. A typical Lithium ion battery should only be charged from a range of 0C to 60C. For this calculation, a Vishay NTHS0402N01N1003J Thermistor was used. This thermistor is 327k at 0C, 100k at 25C and 24.9k at 60C. The thermistor must be biased with a Thevenin voltage source and series resistance to achieve the proper thresholds. A fixed value resistor is added in series with the thermistor to prevent it from becoming too low an impedance at high temperatures and causing the TMP input to default to off.
VTH
To finish the design it is necessary to create the Thevenin Voltage and resistance using a voltage divider from the input pin (IN).
VIN R1 TMP
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RMIN R2 RNTC
The values of R1 and R2 can be calculated as:
RTH TMP RMIN RNTC
R2 = R1 x R TH = 14,800k R1 - R TH
R1 =
R TH = 122k K
Using a value of RMIN that is equal to the thermistor temperature at 60C works well; therefore, for this example, set the value of RMIN to 24.9k. This has the effect of adding 24.9k to the thermistor resistance values so it becomes 352k at 0C, 125k at 25C and 49.8k at 60C. The equations for RTH and VTH are:
0.29 x 0.74 x (R T = 0C - R T = 60C ) VTH = VIN (0.29 x R T = 0C ) - (0.74 x R T = 60C ) = K = 0.99
K R TH = - 1 x R T = 0C = 121k 0.74
In this case, it is not necessary to use R2, because the value is so large it is insignificant. In this case, R1 = RTH. The final circuit for this example is:
VIN 121k TMP 24.9k RNTC
APPLICATIONS APPLICATIONS
The TMP voltages with this circuit are:
TEMP (C) -20 0 25 60 80 RNTC 971k 327k 100k 24.9k 12.6k VTMP (%VIN) 89% 74% 51% 29% 24%
Where R at temperature is the sum of the thermistor plus RMIN.
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
APPLICATION NOTE
POWER STATUS INDICATORS The STAT pin is designed to source or sink current. LEDs can be configured to indicate charging or battery full. The battery full indicator can be connected to DCOK rather than GND to insure it is off when the input power is removed and the STAT pin and DCOK pin go to a high impedance state.
Conditions STAT
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Charge in process Charge completed
Low High
CHARGING PROFILE
Battery Charging USB High Level
4.25 4.20 4.15 B attery V o ltag e Vbat 4.10 4.05 4.00 3.95 3.90 0.0 60.0 Time in minutes 120.0 Ibat 0.50 0.45
CONDITIONING CURRENT
Conditioning Current vs IHCP 60 Conditioning Current (in mA) 50 40 30 20 10 0 0.00
0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 B attery C u u ren t
50.00 IHCP (in uA)
100.00
150.00
CHARTS CHARTS
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
CONSTANT CURRENT (USB LOW)
CONSTANT VOLTAGE
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20% CHARGE RATIO
ADAPTER CHARGE CURRENT
CONDITIONING CURRENT
TERMINATION CURRENT
CHARTS CHART S
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
HOT TMP THRESHOLDS (VIN = 5V)
COLD TMP THRESHOLDS (VIN = 5V)
Rising voltage:
Rising voltage:
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Falling Voltage:
Falling Voltage:
C CHARTS
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
LD
12-Pin Plastic MLP Dual Exposed Pad WWW .Microsemi .C OM
D
D2
Pin 1 ID
K
e A
A1
Dim A A1 A3 D E D2 E2 e K L
Note:
1.
MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 REF 3.00 BSC 3.00 BSC 1.87 2.12 1.06 1.31 0.45 BSC 0.20 MIN 0.30 0.50
A3
INCHES MIN MAX 0.031 0.039 0.000 0.002 0.008 REF 0.118 BSC 0.118 BSC 0.074 0.083 0.042 0.052 0.018 BSC 0.008 MIN 0.012 0.020
L
E2
E
MECHANICALS
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) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 13
LX2207
TM (R)
Three Level Lithium Ion Battery Charger
PRODUCTION DATA SHEET
NOTES
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NOTES NOTES
Copyright (c) 2005 Rev. 1.0, 2007-01-03
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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