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LTC4052-4.2 Lithium-Ion Battery Pulse Charger with Overcurrent Protection
FEATURES
s s
DESCRIPTIO
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s s
s s s s s s s s
Very Low Power Dissipation: 350mW at 1A Complete Standalone Pulse Charger for 1-Cell Lithium-Ion Batteries Requires No Microcontroller, MOSFET or Blocking Diode Sense Resistor Limits Maximum Current for Safety Programmable Charge Termination Timer for Maximum Capacity Charging 1% Float Voltage Accuracy Near End-of-Charge (C/10) Detection Output AC Wall Adapter Present Output Low Battery Drain when Input Supply Is Removed Automatic Trickle Charge for Low Battery Automatic Battery Refresh Thermal Shutdown Protection Tiny Thermally Enhanced MSOP Package
The LTC(R)4052 is a complete standalone pulse charger with integrated MOSFET for 1-cell lithium-ion batteries. An external sense resistor provides overcurrent limiting as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode. As the battery accepts charge and approaches the programmed float voltage, the internal MOSFET begins switching off and on with the duty cycle gradually decreasing as the battery approaches a fully charged condition. A programmable timer terminates the charge cycle. The near end-of-charge C/10 condition is indicated at the CHRG pin when the average charge current falls to onetenth of the wall adapter current. Removing the input voltage puts the LTC4052 into a sleep mode, dropping the battery current drain to less than 1A. The LTC4052 is available in a tiny 8-pin thermally enhanced MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Handheld Computers Cellular Telephones Cradle Chargers
TYPICAL APPLICATIO
VIN = 4.5V TO 10V WITH 1A CURRENT LIMIT
Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger
4.5
4.7 1k 1F 1k
10k 0.047F 7 RSENSE 0.05
BATTERY VOLTAGE (V)
3 VIN LTC4052 GATE 6 CHRG ACPR SENSE BAT TIMER 5 GND 4 1 8
4.0 3.5 3.0 1.0 0.5 0 5 0 0 0.5 1.0 1.5 2.0 TIME (HOURS) 2.5 3.0 C/10 CONSTANT CURRENT PULSING CURRENT CHARGE CYCLE ENDS
AC PRESENT 2
0.022F
1-CELL 4.2V Li-Ion BATTERY
CTIMER 0.1F
4052 TA01
CHRG (V)
CHARGE CURRENT (A)
CHARGE STATUS
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LTC4052 Charge Profile
4052 * TA01b
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LTC4052-4.2
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW SENSE 1 ACPR 2 VIN 3 GND 4 8 BAT 7 GATE 6 CHRG 5 TIMER
Input Supply Voltage (VIN)....................................... 12V BAT Voltage ...............................................- 0.3V to 12V GATE (Note 2) .............................................- 0.3V to 8V SENSE, TIMER .................................. - 0.3V to VIN +0.3V CHRG, ACPR .............................................- 0.3V to 12V SENSE, BAT Peak Current ...................................... 1.5A Operating Temperature Range (Note 3) .. - 40C to 85C Junction Temperature (Note 4) ............................. 125C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC4052EMS8E-4.2 MS8 PART MARKING LTYY
MSE EXPOSED PAD PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125C, JA = 35C/W EXPOSED PAD IS GROUND. (MUST BE SOLDERED TO PCB).
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS
SYMBOL VIN IIN VBAT VRECHRG VMARGIN VIMAX ITRICKLE VTRICKLE RDS(ON) VGATE TTIMER ILEAK VSLEEP VACPR I LEAKACPR VCHRG I LEAKCHRG ICHRG PARAMETER Input Supply Voltage Input Quiescent Supply Current Battery Float Voltage Recharge Battery Voltage Threshold VBAT - VRECHRG Margin Overcurrent Trip Sense Voltage Trickle Charge Current Trickle Charge Threshold Voltage Internal Switch On-Resistance GATE Pin Voltage TIMER Period Accuracy VBAT = 2V VBAT Rising VBAT = 2.6V VBAT = 4V VBAT = 2.6V VBAT = 4V CONDITIONS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 6V unless otherwise noted.
MIN
q q q
TYP 0.7
MAX 10 1.4 4.242 4.242 4.110 4.110 225 120 34 2.55 0.7 0.5
UNITS V mA V V V V mV mV mA V V V
Wall Adapter Open Circuit Voltage Full Charge Mode 0C TA 85C Battery Voltage Falling 0C TA 85C
4.5 4.158 4.137 3.990 3.969 75 90 14 2.35 4.200 4.200 4.050 4.050 150 105 24 2.45 0.45 0.35 6.5 10.5
q q q q q
CTIMER = 0.1F, Full Charge Mode
q
10 1 20 0
q q q q
Battery Leakage Current Through Charger VBAT = 4V, VIN = 0V Sleep Threshold Voltage (VIN - VBAT) Low to High (VIN - VBAT) High to Low ACPR Pin Output Low Voltage ACPR Pin Leakage Current CHRG Pin Output Low Voltage CHRG Pin Leakage Current CHRG Pin Weak Pull-Down Current IACPR = 3mA VIN = 0, VACPR = 6V ICHRG = 3mA, Charging, C/10 Not Reached VIN = 0, VCHRG = 6V VCHRG = 1V, Charging, C/10 Reached
45 15 0.5 0.5
70 0.8 1 0.8 1 70
20
40
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% A mV mV V A V A A
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LTC4052-4.2
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Absolute Maximum Rating for GATE pin applies only to externally applied voltage. During normal operation the LTC4052-4.2's internal charge pump can generate GATE pin voltage exceeding absolute maximum but it is internally current limited. Note 3: The LTC4052EMS8E-4.2 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. Note 4: Junction temperature TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD * JAC/W) Note 5. This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Threshold Voltage vs Temperature
2.47 24.2 24.0 2.46 23.8 30
ITRICKLE (mA)
VTRICKLE (V)
2.45
23.6 23.4 23.2 23.0 22.8
ITRICKLE (mA)
2.44
2.43
2.42 -50 -25
50 25 75 0 TEMPERATURE (C)
Normalized Timer Duration vs Temperature
103 CTIMER= 0.1F 4.200 102 4.195 4.205
TTIMER (%)
VBAT (V)
4.190 4.185 4.180
ICHRG (A)
101
100
99 4.175 98 -50 -25 4.170 -50 -25
50 25 75 0 TEMPERATURE (C)
UW
100 125
4052 G01
Trickle Charge Current vs Temperature
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Trickle Charge Current vs Input Supply Voltage
VBAT = 2V TA = 25C
25
20
22.6 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
15
5
6
7 VIN (V)
8
9
10
4052 G03
4052 G02
Battery Float Voltage vs Temperature
55 50 45 40 35 30
CHRG Pin C/10 Pulldown Current vs Temperature
100
125
50 25 75 0 TEMPERATURE (C)
100
125
25 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
4052 G04
4052 G05
4052 G06
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LTC4052-4.2 TYPICAL PERFOR A CE CHARACTERISTICS
Overcurrent Sense Voltage
105.8 105.6 105.4 650 600 550
RDS(ON) (m)
VIMAX (mV)
105.2 105.0 104.8 104.6 -50 -25
PI FU CTIO S
SENSE (Pin 1): Overcurrent Sense Input. A sense resistor (RSENSE) should be connected from VIN to the SENSE pin to program the current limit level. When overcurrent limit is tripped, the pass transistor immediately turns off and turns back on after a 640ms time-out period (CTIMER = 0.1F). The on-off cycle will continue as long as the overcurrent condition persists or until the timer runs out. If overcurrent protection is not needed, short SENSE to VIN. ACPR (Pin 2): AC Wall Adapter Present Open-Drain Output. When the input voltage (wall adapter) is applied to the LTC4052, this pin is pulled to ground by an internal N-channel MOSFET capable of driving an LED. VIN (Pin 3): Positive Input Supply Voltage (4.5V VIN 10V). Bypass this pin with a 1F capacitor in series with a 4.7 resistor. GND (Pin 4): Electrical Ground Connection and provides a thermal path from the IC to the PC board copper. The exposed backside of the package is also ground and must be soldered to the PC board for maximum power dissipation. TIMER (Pin 5): Timer Set Pin. The timer period is programmed by a capacitor (CTIMER) to ground. The timer period is: tTIMER = (CTIMER * 3Hr)/(0.1F). The minimum ON time, minimum OFF time and the overcurrent time-out period all scale with tTIMER. CHRG (Pin 6): Charge Status Open-Drain Output. When a depleted battery is being charged, the CHRG pin is pulled to ground by an internal N-channel MOSFET capable of driving an LED. Once the duty cycle at the GATE pin drops below 10%, the N-MOSFET turns off and a weak 40A current source to ground turns on to indicate a near endof-charge C/10 condition. When a time-out occurs or the input supply is removed, the CHRG pin becomes high impedance. GATE (Pin 7): Gate Drive Output Pin for Internal and External Pass Transistors. An external N-MOSFET transistor can be connected in parallel with the internal transistor to reduce the on-resistance for higher charge current. In this case, an external blocking diode on VIN is required to prevent damage to the battery if VIN is shorted to ground. A 10A current source pulls this pin up to the charge pump voltage when turned on and a 40A current source pulls it down to ground to turn it off. If an overcurrent condition is detected, the GATE pin is immediately pulled to ground. The voltage at this pin is internally clamped to 12V above the GND pin.
4
UW
Switch On-Resistance vs Temperature
500 VBAT = 2.6V 450 400 350 300 VBAT = 4V
50 25 75 0 TEMPERATURE (C)
100
125
250 -50 -25
0
25
50
75
100
125
TEMPERATURE (C)
4053 G07 4053 G08
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LTC4052-4.2
PI FU CTIO S
A series RC network from the GATE to the VIN pin is required to control the slew rate at the VIN pin when the switch is turned on or off. The slew rate control prevents excessive current from the capacitor usually located in the wall adapter from flowing into the battery when the pass transistor turns on. BAT (Pin 8): Battery Sense Input Pin. An internal resistor divider presets the final float voltage to 4.2V. If the BAT pin drops below 4.05V after the charge cycle has ended, the timer resets and a new charge cycle begins. This pin is clamped to 4.7V if the battery is disconnected while charging.
BLOCK DIAGRA
+-
45mV
VIN
3
+
100ms FILTER
BAT
-
GND
4
TIMER
5
OSCILLATOR
CHRG
6
40A
THERMAL SHUTDOWN
REFERENCE
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ACPR 2 105mV SLEEP IMAX
+ -
-+
VIN 10m 1 SENSE
24mA 7 CHARGE PUMP TRIPLER 8 BAT GATE
TRICKLE CLK
FAST VMIN
+ -
STOP
VRECHRG LOGIC + TIMERS
+ -
C/10
VFLOAT
+ -
TEMP
VMAX
+ -
1.23V
1.23V
4052 BD
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LTC4052-4.2
OPERATIO
The LTC4052 is a complete lithium-ion battery pulse charger with an internal 0.35 N-MOSFET switch driven by an internal charge pump. The charge current is set by the current limit of the input supply (wall adapter). An external RSENSE sets the maximum allowable charge overcurrent and prevents a wall adapter with a high current limit from damaging the battery. If the current limit of the input supply is above IMAX, the charger will immediately turn off the N-MOSFET switch and will retry after 640ms, thus reducing the average charge current to approximately 1% of the overcurrent value (CTIMER = 0.1F). If the battery is disconnected while in full charge mode, the charge pump turns off when the voltage at the BAT pin rises above 4.7V and turns back on when the voltage drops below the float voltage. A charge cycle begins when the voltage at the VIN pin rises above the BAT pin by 45mV. The charger will go into trickle charge mode if the battery voltage is below 2.45V. The trickle charge current is preset to 24mA and is provided by an internal current source. In trickle mode, both the pass transistor and charge pump are off. When the cell voltage exceeds 2.45V, the charger goes into full charge mode. In this mode, the charge pump turns on and ramps up the gate voltage of the pass transistor turning it on. The current limited voltage at the VIN pin will ramp down to VBAT plus the voltage drop across the pass transistor and RSENSE, thus reducing the power dissipa-
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tion in the pass transistor. The charge current is determined by the current limit of the input supply. When the battery voltage reaches the final float voltage, the pass transistor turns off for 100ms (minimum offtime). It remains off as long as the battery voltage stays above the float voltage after the 100ms off-time. After the minimum off-time, if the battery voltage drops below the float voltage, the pass transistor turns back on for at least 400ms (minimum on-time). As the battery approaches full charge, the off-time will get longer and the on-time will stay at 400ms. When the N-MOSFET switch is on, the voltage at the BAT pin will be slightly higher than the final float voltage due to the ESR associated with the battery pack. This voltage level should not be high enough to turn on the overvoltage protection circuitry often located in the battery pack. When the duty cycle at the GATE pin drops below 10%, a comparator turns off the N-FET at the CHRG pin and connects a weak current source (40A) to ground to indicate a near end-of-charge C/10 condition. The pulse charging will continue until the timer stops. An external capacitor at the TIMER pin sets the total charge time, the minimum on- and off-time and the overcurrent retry period. After a time-out has occurred, the charge cycle terminates and the CHRG pin is forced high impedance. After the charging stops, if the battery voltage drops below 4.05V due to external loading or internal battery leakage current, a new charge cycle will automatically resume.
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LTC4052-4.2
APPLICATIO S I FOR ATIO
Input Voltage (Wall Adapter)
The input voltage to the LTC4052 must have some method of current limit capability. The current limit level of the input power source must be lower than the overcurrent limit (IMAX) set by the sense resistor IMAX = 105mV/(RSENSE + 10m). The 10m represents bond wire resistance internal to the IC. If a wall adapter without current limit is used, or the current limit level is above IMAX, the charger will turn on briefly and then immediately turn off when the overcurrent condition is detected. This cycle will be resumed every 640ms (CTIMER = 0.1F) until the total charge time has run out. If overcurrent protection is not needed, short the SENSE pin to VIN. The overcurrent limit selected should be approximately twice the charge current (input supply current limit). Trickle Charge and Defective Battery Detection At the beginning of the charge cycle, if the cell voltage is low (less than 2.45V) the charger goes into a 24mA trickle charge mode. If the low cell voltage persists for one quarter of the total charge time, the battery is considered defective and the charge cycle is terminated. The CHRG pin output is then forced to a high impedance state. Battery Charge Current The battery charge current is determined by the current limit of the input supply (wall adapter). However, this current must not exceed the maximum charge overcurrent, IMAX. If an overcurrent condition is detected, the internal switch immediately turns off, the GATE pin is pulled to ground and the charge pump turns off. The charging will resume after a 640ms time off (CTIMER = 0.1F). Programming the Timer The programmable timer is used to terminate the charge cycle and set the minimum ON/OFF time and the overcurrent time-off period. The length of the timer is programmed by an external capacitor from the TIMER pin to ground. The total charge time is: Time (Hours) = (3 Hours)(CTIMER/0.1F) or CTIMER = 0.1F * Time (Hours)/3 (Hours)
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The timer starts when an input voltage which is at least 40mV greater than VBAT is applied. After a time-out has occurred, the charge cycle stops and the CHRG pin becomes high impedance. CHRG Status Output Pin This open-drain output can report three different charger conditions:
Charger Status Not Charging Charging Charging, C/10 Reached CHRG Pin Behavior High Impedance Strong Pulldown Weak 40A Pulldown
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Using a simple two-resistor network a microprocessor can distinguish all three states. See Figure 1.
VIN 3 VIN LTC4052 CHRG 6 620k 2k OUT IN
4052 F01
VDD
MICROPROCESSOR
Figure 1. Interfacing with Microprocessor
When the LTC4052 is charging a battery, an internal NMOSFET pulls the CHRG pin to ground. When C/10 is reached, the strong NMOS pulldown is replaced by a weak 40A current source pulldown. When the LTC4052 is not charging a battery, the CHRG pin is high impedance. Using the network in Figure 1, the microprocessor can determine charger state using the following procedure: 1. Force the digital output pin, OUT, high and read the logic value at the digital input, IN. If IN reads low, a charger cycle is in progress. 2. If the IN pin is high, force the OUT pin to be high impedance, then read the logic level at the IN pin again. If IN is low, the charge cycle is still in progress, the timer is still running, but the charge current has dropped below 10% of the programmed value indicating that the charge cycle is nearly complete. 3. If the logic level at the IN pin is high, the charge cycle has ended.
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LTC4052-4.2
APPLICATIO S I FOR ATIO
C/10 Detection (Near End-of-Charge) The LTC4052 includes a comparator to monitor the duty cycle at the GATE pin to detect when the battery is nearing full charge. When the duty cycle falls below 10%, the comparator trips and turns off the N-MOSFET at the CHRG pin and switches in a weak (40A) current source to ground. The 40A turns off when the timer terminates the charge cycle. C/10 detection is disabled in trickle charge mode. Internal Pass Transistor An N-channel MOSFET (0.35) pass transistor is included in the LTC4052. The gate of the MOSFET is controlled by an internal charge pump. The body is connected to ground instead of source terminal. There is no body diode from the BAT pin back to the VIN pin; therefore, no blocking diode is required in series with the battery or the input supply. This will not only reduce cost but also reduce the heat generated while in full charge mode. An internal thermal shutdown circuit turns the pass transistor off if the die temperature exceeds approximately 140C with 5C of thermal hysteresis. Gate Drive The MOSFET gate drive consists of a regulated 10A current source charge pump. A series RC network is required from the GATE pin to the VIN pin. When the MOSFET is turned on, the voltage at the VIN pin will begin slewing down to a voltage equal to VBAT plus the voltage drop across the pass transistor and RSENSE. The slew rate is equal to 10A/C. By ramping the VIN pin down slowly, the inrush current is reduced. The resistor in series with the capacitor is required to limit the transient current when the input supply is first applied. When the charge pump is turned off, a 50A current source to ground will start pulling the GATE voltage down. Once the pass transistor is off, the voltage at the VIN pin will begin slewing up with the rate equal to 50A/C. With this external capacitor, the voltage at the VIN pin is ramping in a controlled manner (Figure 2).
VIN 50A/C GATE VOLTAGE 10A/C
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10A/C 50A/C 10A/C 50A/C
4052 TA02
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Figure 2. Slew Rate at GATE and VIN Pins with the RC Network from GATE to VIN
For higher current applications an external power N-channel MOSFET can be connected in parallel with the internal pass transistor. Because the charge pump output is clamped to 12V above GND, the external MOSFET gate to source voltage rating should be 16V or more. Thermal Considerations The power handling capability is limited by the maximum rated junction temperature (125C) and the amount of PC board copper used as a heat sink. The power dissipated by the IC consists of two components: 1. Input supply quiescent current multiplied by the input voltage 2. The voltage drop across the switch (SENSE pin to BAT pin) multiplied by the charge current The LTC4052 has internal thermal shutdown designed to protect the IC from overtemperature conditions. For continuous charging in the fast charge mode, the maximum junction temperature must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. Additional heat sources mounted nearby must also be considered. Surface mount packages rely primarily on the PC board copper to dissipate the heat generated by the package to the surrounding air. Since the PC board copper is the heat sink, generous amounts of copper surrounding the package are recommended to increase the effectiveness of the heat sink.
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LTC4052-4.2
APPLICATIO S I FOR ATIO
In addition, feedthrough vias or plated through holes (located directly beneath the package and elsewhere) connecting internal copper and backside copper layers help transfer and spread the heat generated by the package. Calculating Junction Temperature Example: Find the maximum junction temperature for a battery voltage of 4V (VIN will collapse to approximately VBAT in the full charge mode), charge current of 1A and a maximum ambient temperature of 75C. The power dissipated by the IC is: P = (IBAT * IBAT * RDS(ON)) + (VIN * IIN) = (1A * 1A * 0.35) + (4V * 0.7mA) = 0.35 + 0.003 = 0.353W The LTC4052 is available in an enhanced 8-pin MSOP package which features an exposed copper pad on the bottom of the package allowing it to be soldered directly to the PC board copper for maximum heat transfer. This greatly reduces the thermal resistance and increases the power handling capability when compared to a standard MSOP package. The junction to ambient thermal resistance of this package when the backside of the package is
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soldered to the PC board is approximately 35C/W depending on the copper area. The junction temperature rise above ambient will be approximately: (0.353W)(35C/W) = 12.36C The maximum junction temperature will be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: TJMAX = 85C + 12.36C = 97.36C ACPR Output Pin When the input voltage is 45mV higher than the voltage at the BAT pin, the ACPR pin is pulled to ground to indicate that the input supply (wall adapter) is applied. After the input supply is removed, this pin will become high impedance. An internal 100ms filter prevents the LTC4052 from turning off if the voltage at the VIN pin rings and gets too close to VBAT due to parasitic inductance. Stop Charging The charger is off when the voltage at the VIN pin is less than 45mV above VBAT (sleep mode). The charge pump and the internal pass transistor are turned off, and the internal resistor divider is disconnected to reduce the current drain on the battery in the sleep mode.
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LTC4052-4.2
TYPICAL APPLICATIO
VIN = 5V TO 10V WITH 2A CURRENT LIMIT MBRS120T3 3 4.7 1F AC PRESENT STATUS CHARGE STATUS 1k 1k VIN LTC4052 SENSE 6 2 CHRG ACPR TIMER CTIMER 0.1F 5 GATE BAT GND 4 1 7 8 0.022F 1-CELL 4.2V Li-Ion BATTERY Si2302DS 10k 0.047F RSENSE 25m
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External N-MOSFET for Higher Charge Current
4052 TA03
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LTC4052-4.2
PACKAGE DESCRIPTIO U
MS8E Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1662)
BOTTOM VIEW OF EXPOSED PAD OPTION 1 2.794 0.102 (.110 .004) 0.889 0.127 (.035 .005) 2.06 0.102 (.080 .004) 1.83 0.102 (.072 .004) 2.083 0.102 3.2 - 3.45 (.082 .004) (.126 - .136) 8 0.42 0.04 (.0165 .0015) TYP 0.65 (.0256) BSC 3.00 0.102 (.118 .004) (NOTE 3) 0.52 (.206) REF 8 7 65 DETAIL "A" 0 - 6 TYP 4.90 0.15 (1.93 .006) 3.00 0.102 (.118 .004) NOTE 4 0.53 0.015 (.021 .006) DETAIL "A" 0.18 (.077) SEATING PLANE 0.22 - 0.38 (.009 - .015) TYP 0.13 0.076 (.005 .003)
MSOP (MS8E) 0802
5.23 (.206) MIN
RECOMMENDED SOLDER PAD LAYOUT
0.254 (.010) GAUGE PLANE
1 1.10 (.043) MAX
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4 0.86 (.034) REF
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
0.65 (.0256) BSC
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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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LTC4052-4.2
TYPICAL APPLICATIO
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
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Minimum Component Count 4.2V Li-Ion Battery Charger
VIN = 5V TO 10V WITH 600mA CURRENT LIMIT 3 VIN LTC4052 SENSE NC NC 6 2 CHRG ACPR TIMER CTIMER 0.1F 5 GATE BAT GND 4 1-CELL 4.2V 600mA Li-Ion BATTERY
4052 TA04
10k 0.047F 1 7 8 0.022F
405242f LT/TP 0303 2K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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