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LTC1732-8.4 Lithium-Ion Linear Battery Charger Controller
FEATURES
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DESCRIPTIO
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Complete Linear Charger Controller for 2-Cell Lithium-Ion Batteries Preset Charge Voltage with 1% Accuracy Programmable Charge Current C/10 Charge Current Detection Output Programmable Charge Termination Timer Small, Thin 10-Pin MSOP Package Input Supply (Wall Adapter) Detection Output 8.8V to 12V Input Voltage Range Automatic Sleep Mode When Input Supply Is Removed (Only 10A Battery Drain) Automatic Trickle Charging of Low Voltage Cells Programmable for Constant-Current-Only Mode Battery Insertion Detect and Automatic Charging of Low-Battery Automatic Battery Recharge
The LTC (R)1732-8.4 is a complete constant-current/constant-voltage linear charge controller for lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metalhydride (NiMH) batteries can also be charged with constant current using external termination. Charge current can be programmed with 7% accuracy using external sense and program resistors. An internal resistor divider and precision reference set the final float voltage with 1% accuracy. When the input supply is removed, the LTC1732-8.4 automatically enters a low current sleep mode, dropping the battery drain current to 10A. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until battery voltage exceeds 4.9V. The LTC1732-8.4 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In additon, if the battery remains connected to the charger and the cell voltage drops below 8.05V, a new charge cycle will begin. The LTC1732-8.4 is available in the 10-pin MSOP package.
APPLICATIO S
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Cellular Phones Handheld Computers Charging Docks and Cradles Digital Cameras and Camcorders
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
400mA 2-Cell 8.4V Li-Ion Battery Charger
VIN = 10V MBRM120T3 RSENSE 0.25 Q1 Si9430DY IBAT = 400mA
Typical Li-Ion Charge Cycle
CONSTANT CURRENT CONSTANT VOLTAGE BATTERY VOLTAGE 400 300 CHARGE CURRENT 200 100 0 CHRG LED OFF 7 TIMER STOPS 6 3.0 400mA HR BATTERY 8 9
CHARGE CURRENT (mA)
R1 1k
R2 1k 3
2 SEL
8 VCC SENSE DRV 9 7
1F
CHRG
LTC1732-8.4 10 4 CTIMER 0.1F ACPR TIMER BAT PROG 1 6 RPROG* 19.6k
GND 5
10F
+ 8.4V
Li-Ion BATTERY
0
0.5
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
1732-8.4 TA01
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BATTERY VOLTAGE(V)
2.0 1.5 1.0 TIME (HOURS) 2.5
1732-8.4 TA01b
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LTC1732-8.4
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW BAT SEL CHRG TIMER GND 1 2 3 4 5 10 9 8 7 6 ACPR SENSE VCC DRV PROG
Input Supply Voltage (VCC) ................................... 13.2V SENSE, DRV, BAT, SEL, TIMER, PROG, CHRG, ACPR ................. - 0.3V to 13.2V Operating Temperature Range (Note 2) .... - 40 to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC1732EMS-8.4 MS10 PART MARKING LTWW
MS10 PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 140C, JA = 180C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 9V unless otherwise noted.
SYMBOL VCC ICC PARAMETER Input Supply Voltage Input Supply Current Charger On, Current Mode Shutdown Mode Sleep Mode (Battery Drain Current) 9V VCC 12V, VSEL = VCC RPROG = 19.6k, RSENSE = 0.2 RPROG = 19.6k, RSENSE = 0.2 RPROG = 97.6k, RSENSE = 0.2 ITRIKL VTRIKL VUV VUV VMSD VASD VDIS IPROG VPROG VACPR ICHRG VCHRG IDRV Trickle Charge Current Trickle Charge Threshold Voltage VCC Undervoltage Lockout Voltage VCC Undervoltage Lockout Hysteresis Manual Shutdown Threshold Voltage Automatic Shutdown Threshold Voltage Voltage Mode Disable Threshold Voltage PROG Pin Current PROG Pin Voltage ACPR Pin Output Low Voltage CHRG Pin Weak Pull-Down Current CHRG Pin Output Low Voltage Drive Pin Current PROG Pin Low to High PROG Pin High to Low (VCC - VBAT) High to Low (VCC - VBAT) Low to High VDIS = VCC - VTIMER Internal Pull-Up Current, No RPROG PROG Pin Source Current, VPROG 5mV RPROG =19.6k IACPR = 5mA VCHRG = 1V ICHRG = 5mA VDRV = VCC - 2V 15 2.5
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ELECTRICAL CHARACTERISTICS
CONDITIONS
q q q q q
MIN 8.8
TYP 1 1 10
MAX 12 3 3 30 8.484 535 585 140 125 5.1 8.7
UNITS V mA mA A V mA mA mA mA V V mV V V
VBAT IBAT
Regulated Output Float Voltage Current Mode Charge Current
8.316 465 415 60 30 4.7
8.4 500 100 50 4.9 8.2 400 2.457 2.446
VBAT = 4V, RPROG = 19.6k, ITRIKL = (VCC - VSENSE)/0.2 q From Low to High From Low to High
q q
30 40
54 69
90 100 0.4 300
2.457 0.6 35 0.6 26 1.2 55 1.2
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mV mV V A A V V A V A
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LTC1732-8.4
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 9V unless otherwise noted.
SYMBOL IC/10 tTIMER VRECHRG PARAMETER 10% Charge Current Indication Level TIMER Accuracy Recharge Threshold Voltage CONDITIONS RPROG = 19.6k, RSENSE = 0.2 CTIMER = 0.1F VBAT from High to Low 7.85
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ELECTRICAL CHARACTERISTICS
MIN 25
TYP 50 10 8.05
MAX 100
UNITS mA % V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: The LTC1732EMS-8.4 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Current vs VCC
60
60
55
RPROG = 19.6K RSENSE = 0.2 VBAT = 4V TA = 25
ITRKL (mA)
ITRKL (mA)
50
50
VTRKL (V)
45
40
9
10 VCC (V)
11
UW
1732-8.4 G01
Trickle Charge Current vs Temperature
RPROG = 19.6K RSENSE = 0.2 VBAT = 4V VCC = 9V
Trickle Charge Threshold Voltage vs VCC
4.96 4.95 4.94 4.93 4.92 4.91 RPROG = 19.6K TA = 25
55
45
4.90 4.89
12
40 -50 -25
0
25
50
75
100
125
4.88
9
10 VCC (V)
11
12
1732-8.4 G03
TEMPERATURE (C)
1732-8.4 G02
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LTC1732-8.4 TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Threshold Voltage vs Temperature
4.94 VCC = 9V
4.93
tTIMER (%)
tTIMER (%)
VTRKL (V)
4.92
4.91
4.90 -50 -25
0
25
50
75
TEMPERATURE (C)
1732-8.4 G04
Battery Charge Current vs VCC
520
540
510
IBAT (mA)
RPROG = 19.6K RSENSE = 0.2 VBAT = 6V TA = 25
IBAT (mA)
500
500 490
VPROG (V)
490
480
9
10 VCC (V)
11
Program Pin Voltage vs Temperature
2.470 RPROG = 19.6k VCC = 9V 2.465
VRECHRG (V) VPROG (V)
2.460
2.455
2.450 -50 -25
0
TEMPERATURE (C)
1732-8.4 G10
4
UW
100 25
Timer Accuracy vs VCC
110
110
Timer Accuracy vs Temperature
CTIMER = 0.1F VCC = 9V 105
CTIMER = 0.1F VBAT = 6V TA = 25
105
100
100
95
95
125
90
9
10 VCC (V)
11
12
1732-8.4 G05
90 -50 -25
0
25
50
75
100
125
TEMPERATURE (C)
1732-8.4 G06
Battery Charge Current vs Temperature
530 520 510 RPROG = 19.6K RSENSE = 0.2 VBAT = 6V VCC = 9V
Program Pin Voltage vs VCC
2.48 RPROG = 19.6K VBAT = 6V TA = 25
2.47
2.46
480 470 460 -50 -25 0 25 50 75 100 125
2.45
12
1732-8.4 G07
2.44
9
10 VCC (V)
11
12
1732-8.4 G09
TEMPERATURE (C)
1732-8.4 G08
Recharge Threshold Voltage vs Temperature
8.25 VCC = 9V
8.15
8.05
7.95
50
75
100
125
7.85 -50 -25
0
25
50
75
100
125
TEMPERATURE (C)
1732-8.4 G11
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PIN FUNCTIONS
BAT (Pin 1): Battery Sense Input. A bypass capacitor of 10F or more is required to keep the loop stable when the battery is not connected. A precision internal resistor divider sets the final float voltage. The resistor divider is disconnected in sleep mode to reduce the current drain on the battery. SEL (Pin 2): This pin must be connected to VCC. CHRG (Pin 3): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge current drops to 10% of the full-scale current for more than 15ms, the N-channel MOSFET turns off and a 35A current source is connected from the CHRG pin to GND. When the timer runs out or the input supply is removed, the current source is disconnected and the CHRG pin is forced into a high impedance state. TIMER (Pin 4): Timer Capacitor and Constant-Voltage Mode Disable Input Pin. The timer period is set by placing a capacitor, CTIMER, to GND. The timer period is tTIMER = (CTIMER * 3 hours)/(0.1F). When the TIMER pin is connected to VCC, the timer is disabled, thus the constantvoltage mode is turned off and the IC will operate in constant-current mode only. Shorting the TIMER pin to GND will disable the internal timer function and the C/10 function. GND (Pin 5): Ground. PROG (Pin 6): Charge Current Program and Shutdown Input Pin. The charge current is programmed by connecting a resistor, RPROG to ground. The charge current is IBAT = (VPROG * 800)/(RPROG * RSENSE). The IC can be forced into shutdown by floating the PROG pin and allowing the internal 2.5A current source to pull the pin above the 2.457V shutdown threshold voltage. DRV (Pin 7): Drive Output Pin for the P-Channel MOSFET or PNP Transistor. If a PNP transistor is used, it must have high gain (see Applications Information section). VCC (Pin 8): Input Supply Voltage. VCC can range from 8.8V to 12V. If VCC drops below VBAT + 54mV, for example when the input supply is disconnected, then the IC enters sleep mode with ICC < 30A. Bypass this pin with a 1F capacitor. SENSE (Pin 9): Current Sense Input. A sense resistor, RSENSE, must be connected from VCC to the SENSE pin. This resistor is chosen using the following equation: RSENSE = (VPROG * 800)/(RPROG * IBAT) ACPR (Pin 10): Wall Adapter Present Output. When the input voltage (wall adapter) is applied to the LTC1732-8.4, this pin is pulled to ground by an internal N-channel MOSFET which is capable of sinking 5mA to drive an external LED (See Applications Information Section).
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LTC1732-8.4
BLOCK DIAGRA
UNDERVOLTAGE LOCKOUT VCC = 8.2V
3
CHRG
C/10 STOP RECHRG C/10 35A ACPR SHDN UVLO SLP
720
4
OSCILLATOR VREF
COUNTER
10
ACPR C3
+ -
+
A1
-
2.5A
CHARGE PROG RPROG *THE LTC1732-8.4 IS OPTIMIZED FOR 2-CELL (8.4V) Li-Ion BATTERIES. CONNECT THE SEL PIN TO VCC. FOR CHARGING 8.2V BATTERIES USING THE LTC1732, PLEASE CONTACT THE FACTORY GND
6 BATTERY CURRENT IBAT = (2.457V * 800)/(RPROG * RSENSE)
6
+
VCC
VA VREF 2.457V
-
+
TIMER
LBO
C2 4.9V SEL* 2
-
+
-
W
VCC 8
+
C5
8.05V
-
RSENSE
+
C1 80 800
SENSE
9
-
C4
+ - + -
CA
54mV
DRV BAT
7 1
5
1732-8.4 BD
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LTC1732-8.4
OPERATIO
The LTC1732-8.4 is a linear battery charger controller. The charge current is programmed by the combination of a program resistor (RPROG) from the PROG pin to ground and a sense resistor (RSENSE) between the VCC and SENSE pins. RPROG sets a program current through an internal trimmed 800 resistor setting up a voltage drop from VCC to the input of the current amplifier (CA). The current amplifier servos the gate of the external P-channel MOSFET to force the same voltage drop across RSENSE which sets the charge current. When the voltage at the BAT pin approaches the preset float voltage, the voltage amplifier (VA) will start sinking current which shrinks the voltage drop across RSENSE, thus reducing the charge current. A charge cycle begins when the potential at VCC pin rises above the UVLO level and a program resistor is connected from the PROG pin to ground. At the beginning of the charge cycle, if the battery voltage is below 4.9V, the charger goes into trickle charge mode. The trickle charge current is 10% of the full-scale current. If the battery voltage stays low for one quarter of the total charge time, the charge sequence will terminate. The charger goes into the fast charge constant-current mode after the voltage on the BAT pin rises above 4.9V. In constant-current mode, the charge current is set by the combination of RSENSE and RPROG. When the battery approaches the final float voltage, the charge current will begin to decrease. When the current drops to 10% of the full-scale charge current, an internal comparator will turn off the pull-down N-channel MOSFET at the CHRG pin and connect a weak current source to ground to indicate an end-of-charge (C/10) condition.
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An external capacitor on the TIMER pin sets the total charge time. After a time-out occurs, the charge cycle is terminated and the CHRG pin is forced to a high impedance state. To restart the charge cycle, remove the input voltage and reapply it, or float the PROG pin momentarily. Replacing the battery while in the charge mode will cause the timer to be reset if the voltage of the new battery is below 8.05V. If the voltage is above 8.05V, the timer will continue for the remaining charge time. In the case when a time out has occurred, a new battery with a voltage of less than 8.05V can be inserted and charged automatically with the full programmed charge time. For batteries like lithium-ion that require accurate final float voltage, the internal 2.457V reference, voltage amplifier and the resistor divider provide regulation with 1% (max) accuracy. For NiMH and NiCd batteries, the LTC1732-8.4 can be used as a current source by pulling the TIMER pin to VCC. When in the constant-current only mode, the voltage amplifier, timer, C/10 comparator and the trickle charge function are all disabled. The charger can be shut down by floating the PROG pin(ICC 1mA). An internal current source will pull this pin high and clamp it at 3.5V. When the input voltage is not present, the charger goes into a sleep mode, dropping ICC to 10A. This greatly reduces the current drain on the battery and increases the standby time.
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APPLICATIONS INFORMATION
Charger Conditions The charger is off when any of the following conditions exist: the VCC pin is less than 8.2V, the dropout voltage (VCC - VBAT) is less than 54mV, or the PROG pin is floating. The DRV pin will be pulled to VCC and the internal resistor divider is disconnected to reduce the current drain on the battery. Undervoltage Lockout (UVLO) An internal undervoltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until VCC rises above 8.2V. To prevent oscillation around VCC = 8.2V, the UVLO circuit has built-in hysteresis. Trickle Charge and Defective Battery Detection At the beginning of the charging sequence, if the battery voltage is below 4.9V, the charger goes into trickle mode. The charge current drops to 10% of the full-scale current. If the low voltage persists for one quarter of the total charge time, the battery is considered defective, the charge cycle is terminated and the CHRG pin output is forced to a high impedance state. Shutdown The LTC1732-8.4 can be forced into shutdown by floating the PROG pin and allowing the internal 2.5A current source to pull the pin above the 2.457V shutdown threshold voltage. The DRV pin is pulled up to VCC turning off the external P-channel MOSFET. The internal timer is reset in the shutdown mode. Programming Charge Current The formula for the battery charge current (see Block Diagram) is: IBAT = (IPROG)(800/RSENSE) = (2.457V/RPROG)(800/RSENSE) or For example, if 0.5A charge current is needed, select a value for RSENSE that will drop 100mV at the maximum charge current. RSENSE = 0.1V/0.5A = 0.2, then calculate: RPROG = (2.457V/500mA)(800/0.2) = 19.656k For best stability over temperature and time, 1% resistors are recommended. The closest 1% resistor value is 19.6k. Programming the Timer The programmable timer terminates the charge cycle. Typically, when charging at a 1C rate, a discharged Li-Ion battery will become fully charged in 3 hours. For lower charge current rates, extend the timer accordingly.The length of the timer is programmed by an external capacitor at the TIMER pin. The total charge time is: Time (Hours) = (3 Hours) * (CTIMER/0.1F) or CTIMER = 0.1F * Time (Hours)/3 (Hours) The timer starts when an input voltage greater than 8.2V is applied and the program resistor is connected to ground. After a time-out occurs, the CHRG output will go into a high impedance state to indicate that charging has stopped. Connecting the TIMER pin to VCC disables the timer and also puts the charger into a constant-current mode. To only disable the timer function, short the TIMER pin to GND. CHRG Status Output Pin When a charge cycle starts, the CHRG pin is pulled to ground by an internal N-channel MOSFET that can drive an LED. When the battery current drops to 10% of the fullscale current (C/10), the N-channel MOSFET is turned off and a weak 35A current source to ground is connected to the CHRG pin. After a time-out occurs, the pin will go into a high impedance state. By using two different value pullup resistors, a microprocessor can detect three states from this pin (charging, C/10 and stop charging). See Figure 1 and Table 1.
RPROG = (2.457V/IBAT)(800/RSENSE) where RPROG is the total resistance from the PROG pin to ground.
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LTC1732-8.4
APPLICATIONS INFORMATION
V+ 8 VCC CHRG LTC1732-8.4 3 400k 2k OUT IN
1732-8.4 F01
VDD
PROCESSOR
Figure 1. Microprocessor Interface Table 1. Microprocessor Interface
IN LOW LOW HIGH OUT HIGH Hi-Z Hi-Z CHARGE STATUS Charge C/10 Stop Charging
When the LTC1732-8.4 is in charge mode, the CHRG pin is pulled low by an internal N-channel MOSFET. To detect this mode, force the digital output pin, OUT, high and measure the voltage at the CHRG pin. The N-channel MOSFET will pull the pin low even with a 2k pull-up resistor. Once the charge current drops to 10% of the fullscale current (C/10), the N-channel MOSFET is turned off and a 35A current source is connected to the CHRG pin. The IN pin is then pulled high by the 2k pull-up. By forcing the OUT pin into a high impedance state, the current source pulls the pin low through the 400k resistor. When the internal timer has expired, the CHRG pin changes to high impedance and the 400k resistor pulls the pin high to indicate that charging has stopped.
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ACPR Output Pin The LTC1732-8.4 has an ACPR output pin to indicate that the input supply (wall adapter) is higher than 8.2V and 55mV above the voltage at the BAT pin. When both conditions are met, the ACPR pin is pulled to ground by an N-channel MOSFET that is capable of driving an LED. Otherwise, this pin is high impedance. CHRG Status Output Pin (C/10) The LTC1732-8.4 includes a comparator to monitor the charge current to detect a near end-of-charge condition. This comparator does not terminate the charge cycle, but provides an output signal to indicate a near full charge condition. The timer is used to terminate the charge cycle. When the battery current falls below 10% of full scale, the comparator trips and turns off the N-channel MOSFET at the CHRG pin and switches in a 35A current source to ground. After an internal time delay of 15ms, this state is latched. This delay helps prevent false triggering due to transient currents. The end-of-charge comparator is disabled in trickle charge mode. Gate Drive Typically the LTC1732-8.4 controls an external P-channel MOSFET to supply current to the battery. An external PNP transistor can also be used as the pass transistor instead of the P-channel MOSFET. Due to the low current gain of the current amplifier (CA), a high gain Darlington PNP transistor is required to avoid excessive charge current error. The gain of the current amplifier is around 0.6A/ mV. For every 1A of base current, a 1.6mV of gain error shows up at the inputs of CA. With RPROG = 19.6k (100mV across RSENSE), it represents 1.67% of error in charging current.
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LTC1732-8.4
APPLICATIONS INFORMATION
Constant-Current Only Mode The LTC1732-8.4 can be used as a programmable current source by connecting the TIMER pin to VCC. This is particularly useful for charging NiMH or NiCd batteries. In the constant-current only mode, the timer and voltage amplifier are both disabled. An external termination method is required to properly terminate the charge. Battery Detection The LTC1732-8.4 can detect the insertion of a new battery. When a battery with voltage of less than 8.05V is inserted, the LTC1732-8.4 resets the timer and a new charge cycle begins. If the voltage of the new battery is above 8.05V, the charging will not start if the TIMER has already timed out. If a new battery (with a voltage above 8.05V) is inserted while in the charging process, the timer will not be reset and charging will continue until the timer runs out. After a time out has occurred and the battery remains connected, a new charge cycle will begin if the battery voltage drops below 8.05V due to self-discharge or external loading. VCC Bypass Capacitor Many types of capacitors can be used for input bypassing. However, caution must be exercised when using multilayer ceramic capacitors. Because of the self resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a hot power source. To minimize these transients, only ceramic capacitors with X5R or X7R dielectric are recommended. Also, adding 1 or 2 in series with the ceramic capacitor will further reduce these start-up transients. For more information refer to Application Note 88. Stability The charger is stable without any compensation when a P-channel MOSFET is used as the pass transistor. However, a 10F capacitor is recommended at the BAT pin to keep the ripple voltage low when the battery is disconnected. If a PNP transistor is used for the pass transistor, a 1000pF capacitor is required from the DRV pin to VCC. This capacitor is needed to help stablize the voltage loop. A 10F capacitor at the BAT pin is also recommended when a battery is not present.
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LTC1732-8.4
PACKAGE DESCRIPTIO
5.23 (.206) MIN
0.50 3.05 0.38 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT WITHOUT EXPOSED PAD OPTION DETAIL "A" 0 - 6 TYP
0.254 (.010) GAUGE PLANE
0.18 (.007) SEATING PLANE 0.17 - 0.27 (.007 - .011) 0.13 0.05 (.005 .002)
MSOP (MS) 1001
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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MS Package 10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 0.127 (.035 .005) 3.2 - 3.45 (.126 - .136) 3.00 0.102 (.118 .004) (NOTE 3) 10 9 8 7 6 0.497 0.076 (.0196 .003) REF 4.88 0.10 (.192 .004) 3.00 0.102 (.118 .004) NOTE 4 12345 0.53 0.01 (.021 .006) DETAIL "A" 1.10 (.043) MAX 0.86 (.034) REF 0.50 (.0197) TYP
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LTC1732-8.4
TYPICAL APPLICATIO
CHARGE STATUS 2k
CTIMER* 0.1F
RELATED PARTS
PART NUMBER LT(R)1510-5 LT1512 LTC1571-1/ LTC1571-2/ LTC1571-5 LT1620 LTC1729 LTC1730/ LTC4052 LTC1731 LTC1732-4/ LTC1732-4.2 LTC1733 LTC1734/ LTC1734L LTC4050 LTC4053 DESCRIPTION 500kHz Constant-Voltage/Constant-Current Battery Charger SEPIC Battery Charger 200kHz/500kHz 1.5A Constant-Current/Constant-Voltage Battery Charger Rail-to-Rail Current Sense Amplifier Termination Controller for Li-Ion Complete Li-Ion Pulse Battery Charger with Internal FET and Thermal Regulation Complete Li-Ion Linear Battery Charger Controller Complete Linear Battery Charger Controller for Single Cell Li-Ion Battery CompleteLi-Ion Linear Battery Charger with Internal FET ThinSOT Li-Ion Linear Charger COMMENTS Most Compact, Up to 1.5A, Charges NiCd, NiMH, Li-Ion Cells VIN Can Be Higher or Lower Than Battery Voltage, 1.5A Switch Charges 1- or 2-Cell Li-Ion Batteries, Preset and Adjustable Battery Voltages, C/10 Charge Detection Precise Output Current Programming, Up to 32VOUT, Up to 10A IOUT Time or Charge Current Termination, Automatic Charger/Battery Detection, Status Output, Preconditioning, 8-Lead MSOP Efficient 1.5A Charger with Many Features Including Overcurrent Battery Protection Single Cell and 2-Cell Li-Ion, C/10 Detection, Complete Charger No Firmware Required, AC Adapter Indicator Automatic Charge and Recharge 1.5A Charger with Many Features Including Thermal Feedback for Increased Charge Current without Exceeding Maximum Temperature Only Two External Components, VPROG Tracks ICHARGE No Diode Needed, No Sense Resistor Needed, 50mA to 700mA Charge Current No Firmware Required, AC Adapter Indicator Automatic Charge and Recharge Operate from Wall Adapter Input and/or USB Input, 100mA/500mA up to 1.25A Charge Current, Thermal Limit Prevent Over Heating, Standalone Charger. Automatic Switching Between DC Sources, Load Sharing, Replaces ORing Diodes
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Complete Li-Ion Linear Charger with Thermistor Interface USB Compatible Li-Ion Linear Battery Charger
LTC4412
Low Loss PowerPathTM Controller in ThinSOTTM
ThinSot and PowerPath are trademarks of Linear Technology Corporation.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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2-Cell 8.4V Linear Charger Using a PNP Pass Transistor
VIN = 10V MBRM120T3 R2 2k C1 1nF R1 10k RSENSE 0.25 Q2 ZTX749 Q1 2N5087 IBAT = 400mA 2 3 8 C3 1F 10 SEL VCC 9 CHRG SENSE LTC1732-8.4 7 DRV ACPR BAT 4 TIMER GND 5 PROG 1 6 RPROG 19.6k *AVX 0603ZC104KAT1A
+
2-CELL Li-ION
C2 10F
1732 TA02
LT/TP 0203 2K * PRINTED IN THE USA
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Price & Availability of LTC1732-84

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