LTC4002EDD-4.2

LTC4002-4.2 LINER

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Technical content

, LTC and LT are registered trademarks of Linear Technology Corporation. Information furnished by Linear Technology Corporation is believed to be accurate and reliable. tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. final float voltage to 4.2V with –1% accuracy.

400242 F01

Figure 1. 1.5A Single Cell Li-Ion Battery Charger

400242 TA02

LTC4002-4.2 400242i ORDER PART NUMBER Consult LTC Marketing for parts specified with wider operating temperature ranges. LTC4002EDD-4.2 ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W (Note 1) TJMAX = 125°C, qJA = 110°C/W TOP VIEW NTC SENSE BAT CHRG COMP V CC GATE GND S8 PACKAGE 8-LEAD PLASTIC SO DD PART MARKING LAGG Operating Temperature Range (Note 2) .. – 40°C to 85°C TOP VIEW DD PACKAGE 10-LEAD (3mm · 3mm) PLASTIC DFN 1 NC NTC SENSE BAT CHRG COMP V CC GATE PGND SGND ORDER PART NUMBER LTC4002ES8-4.2 S8 PART MARKING 400242 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 10V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DC Characteristics VCC VCC Supply Voltage l 4.7 24 V ICC VCC Supply Current Current Mode 3 5 mA Shutdown Mode 3 5 mA Sleep Mode 10 20 mA VBAT Battery Regulated Float Voltage 5V £ VCC £ 24V (Note 2) 4.168 4.2 4.232 V l 4.158 4.242 V VSNS(CHG) Constant Current Sense Voltage 3V £ VBAT £ 4V (Note 3) 0 °C £ TA £ 85°C l 93 100 107 mV –40°C £ TA £ 85°C l 90 110 mV VSNS(TRKL) Trickle Current Sense Voltage V BAT = 0V (Note 3) 5 10 15 mV VTRKL Trickle Charge Threshold Voltage V BAT Rising 2.75 2.9 3.05 V VUV VCC Undervoltage Lockout Threshold Voltage V CC Rising 3.9 4.2 4.5 V DVUV VCC Undervoltage Lockout Hysteresis Voltage 200 mV VMSD Manual Shutdown Threshold Voltage COMP Pin Falling 200 360 500 mV VASD Automatic Shutdown Threshold Voltage V CC – VBAT 250 mV ICOMP COMP Pin Output Current V COMP = 1.2V 100 mA ICHRG CHRG Pin Weak Pull-Down Current V CHRG = 1V 15 25 35 mA VCHRG CHRG Pin Output Low Voltage I CHRG = 1mA 0.15 0.3 V REOC End-of-Charge Ratio V SNS(EOC)/VSNS(CHG) 10 25 32 % tTIMER Charge Time Accuracy 10 % TJMAX = 125°C, qJA = 43°C/W EXPOSED PAD IS GND (PIN 11) MUST BE SOLDERED TO PCB

LTC4002-4.2 400242i ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 10V unless otherwise noted. Note 1: Absolute Maximum Rating are those values beyond which the life of a device may be impaired. TYPICAL PERFOR A CE CHARACTERISTICS UW Supply Current vs Temperature Supply Current vs V CC Oscillator Frequency vs Temperature Note 2: The LTC4002-4.2 is tested with Test Circuit 1. Note 3: The LTC4002-4.2 is tested with Test Circuit 2. TEMPERATURE (°C) –50 ICC (mA) 3.5 4.0 25 75

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3.0 –25 0 50 100 125 2.5 VCC (V) ICC (mA)3

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TEMPERATURE (°C) –5 0 fOSC (kHz)

400242 G03

–2 5 0 5 0 450 550 75 100 125 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTC NTC Pin Output Current V NTC = 0.85V l 75 85 95 mA VNTC-HOT NTC Pin Threshold Voltage (Hot) V NTC Falling l 340 355 370 mV Hysteresis 25 mV VNTC-COLD NTC Pin Threshold Voltage (Cold) V NTC Rising l 2.428 2.465 2.502 V Hysteresis 170 mV DVRECHRG Recharge Battery Voltage Offset from Full V BAT(FULLCHARGED) – VRECHRG, VBAT Falling 100 150 200 mV Charged Battery Voltage ILEAK CHRG Pin Leakage Current V CHRG = 8V, Charging Stops 1 mA Oscillator fOSC Switching Frequency 450 500 550 kHz DC Maximum Duty Cycle 100 % Gate Drive tr Rise Time C GATE = 2000pF, 10% to 90% 20 ns tf Fall Time C GATE = 2000pF, 90% to 10% 50 ns DVGATE Output Clamp Voltage V CC – VGATE, VCC ‡ 9V l 8V DVGATEHI Output High Voltage DVGATEHI = VCC – VGATE, VCC ‡ 7V l 0.3 V DVGATELO Output Low Voltage DVGATELO = VCC – VGATE, VCC ‡ 7V l 4.5 V TA = 25°C, VCC = 10V unless otherwise noted.

LTC4002-4.2 400242i Oscillator Frequency vs VCC Current Mode Sense Voltage vs Temperature Trickle Charge Voltage vs Temperature Trickle Charge Voltage vs VCC VCC (V) fOSC (kHz)500

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TEMPERATURE (°C) –5 0 VSNS (mV)

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–2 5 0 5 0 104 75 100 125 VBAT = 4V Current Mode Sense Voltage vs VCC VCC (V) VSNS (mV)100

102 VBAT = 4V

TEMPERATURE (°C) –5 0 VTRKL (V)

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2.9 –2 5 0 5 0 2.8 3.0 75 100 125 VCC (V) VTRKL (V) 2.9

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2.8 10 15 20

3.0 VBAT = 4V

CHRG Pin Output Low Voltage vs VCC CHRG Pin Output Low Voltage vs Temperature VCC (V) VCHRG (mV)140

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150 ILOAD = 1mA

TEMPERATURE (°C) –5 0 VCHG (mV)

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–2 5 0 5 0 100 180 75 100 125 ILOAD = 1mA CHRG Pin Weak Pull-Down Current vs Temperature CHRG Output Pin Weak Pull-Down Current vs VCC TEMPERATURE (°C) –5 0 ICHRG (µA)

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–2 5 0 5 0 75 100 125 VCHRG = 8V VCC (V)

22 ICHRG (µA)

400242 G11

VCHRG = 8V TYPICAL PERFOR A CE CHARACTERISTICS UW TA = 25°C, VCC = 10V unless otherwise noted.

LTC4002-4.2 400242i NTC Pin Output Current vs VCC Recharge Voltage Offset from Full Charged Voltage vs Temperature Recharge Voltage Offset from Full Charged Voltage vs V CC End-of-Charge Ratio vs Temperature Trickle Charge Sense Voltage vs Temperature Trickle Charge Sense Voltage vs V CC TEMPERATURE (°C) –5 0 VSNS (mV)

400242 G12

10.0 –2 5 0 5 0 9.6 10.4 75 100 125 VBAT = 2.5V VCC (V) VSNS (mV)10

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11 VBAT = 2.5V NTC Pin Output Current vs Temperature COMP Pin Output Current vs VCC COMP Pin Output Current vs Temperature VCC (V) ICOMP (µA) 100

400242 G14

102 VCOMP = 0V

TEMPERATURE (°C) –5 0 ICOMP (µA)

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–2 5 0 5 0 104 75 100 125 VCOMP = 0V VCC (V) INTC (µA)

400242 G16

86 VNTC = 0V

TEMPERATURE (°C) –5 0 INTC (µA)

400242 G17

–2 5 0 5 0 75 100 125 VNTC = 0V TEMPERATURE (°C) –5 0 ∆VRECHRG (mV)

400242 G18

–2 5 0 5 0 110 190 75 100 125 VCC (V) ∆VRECHRG (mV) 150

400242 G19

TEMPERATURE (°C) –5 0 REOC (%)

400242 G20

–2 5 0 5 0 75 100 125 TYPICAL PERFOR A CE CHARACTERISTICS UW TA = 25°C, VCC = 10V unless otherwise noted.

LTC4002-4.2 400242i UUUPI FU CTIO S COMP (Pin 1/Pin 1): Compensation, Soft-Start and Shut- down Control Pin. The COMP pin is the control signal of the inner loop of the current mode PWM. Charging begins when the COMP pin reaches 800mV. The recommended compen- sation components are a 0.47mF (or larger) capacitor and a 2.2k series resistor. A 100mA current into the compen- sation capacitor also sets the soft-start slew rate. Pulling the COMP pin below 350mV will shut down the charger. V CC (Pin 2/Pin 2): Positive Supply Voltage Input. VCC can range from 4.7V to 24V. A 0.1 mF or higher capacitor is required at the VCC pin with the lead length kept to a mini- mum. A 10mF low ESR capacitor is also required at the source pins of the power P-channel MOSFET. GATE (Pin 3/Pin 3): Gate Drive Output. Driver Output for the P-Channel MOSFET. The voltage at this pin is internally clamped to 8V below VCC, allowing a low voltage MOSFET with gate-to-source breakdown voltage of 8V or less to be used. PGND, SGND, Exposed Pad, GND (Pins 4, 5, 11/4): IC Ground. CHRG (Pin 6/Pin 5): Open-Drain Charge Status Output. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge current drops to 25% of the full-scale current for more than 120ms, the N-channel MOSFET turns off and a 25mA cur- rent source is connected from the CHRG pin to GND. When the timer runs out or the input supply is removed, the 25mA current source is turned off and the CHRG pin becomes high impedance. BAT (Pin 7/Pin 6): Battery Sense Input. A bypass capaci- tor of 22 mF is required to minimize ripple voltage. An internal resistor divider, which is disconnected in sleep mode, sets the final float voltage at this pin. If the battery connection is opened when charging, an overvoltage circuit will limit the charger output voltage to 10% above the programmed float voltage. When VBAT is within 250mV of V CC, the LTC4002-4.2 is forced into sleep mode, dropping ICC to 10mA. SENSE (Pin 8/Pin 7): Current Amplifier Sense Input. A sense resistor, RSENSE, must be connected between the SENSE and BAT pins. The maximum charge current is equal to 100mV/R SENSE. NTC (Pin 9/Pin 8): NTC (Negative Temperature Coefficient) Thermistor Input. With an external 10kW NTC thermistor to ground, this pin senses the temperature of the battery pack and stops the charger when the temperature is out of range. When the voltage at this pin drops below 350mV at Undervoltage Lockout Threshold vs Temperature End-of-Charge Ratio vs VCC VCC (V)

21 REOC (%)25

400242 G21

TEMPERATURE (°C) –5 0 VUV (V)

400242 G22

4.2 –2 5 0 5 0 4.0 4.4 75 100 125 VCC RISING TYPICAL PERFOR A CE CHARACTERISTICS UW TA = 25°C, VCC = 10V unless otherwise noted. (DFN/SO-8)

LTC4002-4.2 400242i BLOCK DIAGRA W + +– CEOC 20mV DRIVER 100mV SENSE CA VA CLB COV CRQ CCOLD CHOT GATE BAT 4.2V 2.9V 4.62V 4.05V 2.465V 350mV 50mV 400242 BD NTC VCC 85µA TEMP RQ UV LOGIC NTC_DISABLE EOC STOP SD C/10 UVLO 4.2V R R S CLK: Q CPWM RSLOP ILISLOP100µA RIL VCC COMP CHRG GND CSD 350mV 25µA 90µA UUUPI FU CTIO S(DFN/SO-8) hot temperature or rises above 2.465V at cold temperature, charging is suspended and the internal timer stops. The CHRG pin output is not affected during this hold state. To disable the temperature qualification function, ground the NTC pin. NC (Pin 10/NA): No Connect.

LTC4002-4.2 400242i TEST CIRCUITS Test Circuit 1 Test Circuit 2 100µA LTC4002-4.2 SENSE BAT VBAT

400242 TC01

10ΩCA COMP LT1006 15V 1.5V 100µA LTC4002-4.2 SENSE BAT 4.2V

400242 TC02

10ΩCA VA COMP LT1006 15V 1.5V 1mA

LTC4002-4.2 400242i OPERATIOU The LTC4002 is a constant current, constant voltage Li-Ion battery charger controller that uses a current mode PWM step-down (buck) switching architecture. The charge current is set by an external sense resistor (R SENSE) across the SENSE and BAT pins. The final battery float voltage is internally set to 4.2V. For batteries like lithium- ion that require accurate final float voltage, the internal 2.465V reference, voltage amplifier and the resistor di- vider provide regulation with –1% accuracy. A charge cycle begins when the voltage at the V CC pin rises above the UVLO level (4.2V) and is 250mV or more greater than the battery voltage. At the beginning of the charge cycle, if the battery voltage is less than 2.9V, the charger goes into trickle charge mode. The trickle charge current is internally set to 10% of the full-scale current. If the battery voltage stays low for 30 minutes, the battery is considered faulty and the charge cycle is terminated. When the battery voltage exceeds 2.9V, the charger goes into the full-scale constant current charge mode. In con- stant current mode, the charge current is set by the external sense resistor R SENSE and an internal 100mV reference; IBAT = 100mV/RSENSE. When the battery voltage approaches the programmed float voltage, the charge current will start to decrease. When the current drops to 25% of the full-scale charge current, an internal comparator turns off the internal pull- down N-channel MOSFET at the CHRG pin, and connects a weak current source to ground to indicate a near end-of- charge condition. An internal 3 hour timer determines the total charge time. After a time out occurs, the charge cycle is terminated and the CHRG pin is forced high impedance. To restart the charge cycle, remove and reapply the input voltage or momentarily shut the charger down. Also, a new charge cycle will begin if the battery voltage drops below the recharge threshold voltage of 4.05V. When the input voltage is present, the charger can be shut down (ICC = 3mA) by pulling the COMP pin low. When the input voltage is not present, the charger goes into sleep mode, dropping ICC to 10mA. This will greatly reduce the current drain on the battery and increase the standby time. A 10kW NTC (negative temperature coefficient) thermistor can be connected from the NTC pin to ground for battery temperature qualification. The charge cycle is suspended when the temperature is outside of the 0 °C to 50 °C window (with DALE NTHS-1206N02).

has 200mV of built-in hysteresis. nated and the CHRG pin is forced to be high impedance. impedance and the quiescent current remains at 3mA. mode, reducing the battery drain current. or the charger is in manual shutdown or sleep mode. and a 25mA current source is connected to the CHRG pin.

400242 F02

Figure 2. Microprocessor Interface

LTC4002-4.2 400242i Gate Drive The LTC4002-4.2 gate driver can provide high transient currents to drive the external pass transistor. The rise and fall times are typically 20ns and 50ns respectively when driving a 2000pF load, which is typical for a P-channel MOSFET with R DS(ON) in the range of 50mW . A voltage clamp is added to limit the gate drive to 8V below VCC. For example, if VCC is 10V then the GATE output will pull down to 2V max. This allows low voltage P-channel MOSFETs with superior R DS(ON) to be used as the pass transistor thus increasing efficiency. Stability Both the current loop and the voltage loop share a com- mon, high impedance, compensation node (COMP pin). A series capacitor and resistor on this pin compensates both loops. The resistor is included to provide a zero in the loop response and boost the phase margin. The compensation capacitor also provides a soft-start function for the charger. Upon start-up, the COMP pin voltage will quickly rise to 0.05V, due to the 2.2k series resistor, then ramp at a rate set by the internal 100mA pull- up current source and the external capacitor. Battery charge current starts ramping up when the COMP pin voltage reaches 0.8V and full current is achieved with the COMP pin at 1.3V. With a 0.47mF capacitor, time to reach full charge current is about 235ms. Capacitance can be increased up to 1mF if a longer start-up time is needed. Automatic Battery Recharge After the 3 hour charge cycle is completed and both the battery and the input power supply (wall adapter) are still connected, a new charge cycle will begin if the battery voltage drops below 4.05V due to self-discharge or exter- nal loading. This will keep the battery capacity at more than 80% at all times without manually restarting the charge cycle. Battery Temperature Detection A negative temperature coefficient (NTC) thermistor located close to the battery pack can be used to monitor battery temperature and will not allow charging unless the battery temperature is within an acceptable range. Connect a 10kW thermistor (DALE NTHS-1206N02) from the NTC pin to ground. If the temperature rises to 50°C, the resistance of the NTC will be approximately 4.1kW . With the 85 mA pull-up current source, the Hot temperature voltage threshold is 350mV. For Cold temperature, the voltage threshold is set at 2.456V which is equal to 0 °C NTC @ 28.4k W ) with 85 mA of pull-up current. If the temperature is outside the window, the GATE pin will be pulled up to V CC and the timer frozen while the output status at the CHRG pin remains the same. The charge cycle begins or resumes once the temperature is within the acceptable range. Short the NTC pin to ground to disable the temperature qualification feature. APPLICATIO S I FOR ATIOWU UU

LTC4002-4.2 400242i Input and Output Capacitors Since the input capacitor is assumed to absorb all input switching ripple current in the converter, it must have an adequate ripple current rating. Worst-case RMS ripple cur- rent is approximately one-half of output charge current. Actual capacitance value is not critical. Solid tantalum capacitors have a high ripple current rating in a relatively small surface mount package, but caution must be used when tantalum capacitors are used for input bypass. High input surge currents can be created when the adapter is hot-plugged to the charger and solid tantalum capacitors have a known failure mechanism when subjected to very high turn-on surge currents. Selecting the highest pos- sible voltage rating on the capacitor will minimize prob- lems. Consult with the manufacturer before use. The selection of output capacitor C OUT is primarily deter- mined by the ESR required to minimize ripple voltage and load step transients. The output ripple DVOUT is approxi- mately bounded by: D£ D + æ Łç ö ł÷V I ESR fCOUT L OSC OUT Since DIL increases with input voltage, the output ripple is highest at maximum input voltage. Typically, once the ESR requirement is satisfied, the capacitance is adequate for filtering and has the necessary RMS current rating. APPLICATIO S I FOR ATIOWU UU Switching ripple current splits between the battery and the output capacitor depending on the ESR of the output ca- pacitor and the battery impedance. EMI considerations usually make it desirable to minimize ripple current in the battery leads. Ferrite beads or an inductor may be added to increase battery impedance at the 500kHz switching frequency. If the ESR of the output capacitor is 0.2W and the battery impedance is raised to 4W with a bead or induc- tor, only 5% of the current ripple will flow in the battery. Design Example As a design example, take a charger with the following specifications: V IN = 5V to 24V, VBAT = 4V nominal, IBAT = 1.5A, fOSC = 500kHz, see Figure 1. First, calculate the SENSE resistor : RSENSE = 100mV/1.5A = 68mW Choose the inductor for about 65% ripple current at the maximum VIN: L V kHz A V V H= () ( ) ( ) æ Łç ö ł÷ =m4 500 0 65 1 5 1 4 24 6 838.. ±. Selecting a standard value of 6.8mH results in a maximum ripple current of : () m() æ Łç ö ł÷ =I V kHz H V V mAL 500 6 8 1 4 24 980 4. ±.

LTC4002-4.2 400242i APPLICATIO S I FOR ATIOWU UU Next, choose the P-channel MOSFET. The Si6435ADQ in a TSSOP-8 package with RDS(ON) = 42mW (nom), 55mW (max) offers a small solution. The maximum power dissi- pation with V IN = 5V and V BAT = 4V at 50 °C ambient temperature is: P AmV 5 0 099 2. . CIN is chosen for an RMS current rating of about 0.8A at 85°C. The output capacitor is chosen for an ESR similar to the battery impedance of about 100mW . The ripple voltage on the BAT pin is: V I ESR A mV OUT RIPPLE LM A X = D () = () W() = 09 8 01 2 49 C1: Taiyo Yuden TMK325BJ106MM C2: Taiyo Yuden JMK325BJ226MM L1: TOKO B952AS-6R8N The Schottky diode D2 shown in Figure 1 conducts current when the pass transistor is off. In a low duty cycle case, the current rating should be the same or higher than the charge current. Also it should withstand reverse voltage as high as V IN. Board Layout Suggestions When laying out the printed circuit board, the following considerations should be taken to ensure proper opera- tion of the LTC4002-4.2. GATE pin rise and fall times are 20ns and 50ns respectively (with C GATE = 2000pF). To minimize radiation, the catch diode, pass transistor and the input bypass capacitor traces should be kept as short as possible. The positive side of the input capacitor should be close to the source of the P-channel MOSFET; it provides the AC current to the pass transistor. The connection between the catch diode and the pass transistor should also be kept as short as possible. The SENSE and BAT pins should be connected directly to the sense resistor (Kelvin sensing) for best charge current accuracy. The compensation capacitor connected at the COMP pin should return to the ground pin of the IC or as close to it as possible. This will prevent ground noise from disrupt- ing the loop stability. The ground pin also works as a heat sink, therefore use a generous amount of copper around the ground pin. This is especially important for high V CC and/or high gate capacitance applications.

LTC4002-4.2 400242i UPACKAGE DESCRIPTIO 3.00 –0.10 (4 SIDES) NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED 5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.38 – 0.10 BOTTOM VIEW—EXPOSED PAD 1.65 – 0.10 (2 SIDES) 0.75 –0.05 R = 0.115 TYP 2.38 –0.10 (2 SIDES) 106 PIN 1 TOP MARK (SEE NOTE 5)

0.200 REF

0.00 – 0.05 (DD10) DFN 0403 0.25 – 0.05 2.38 –0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 1.65 –0.05 (2 SIDES)2.15 –0.05 0.50 BSC 0.675 –0.05 3.50 –0.05 PACKAGE OUTLINE 0.25 – 0.05

0.50 BSC

10-Lead Plastic DFN (3mm · 3mm) (Reference LTC DWG # 05-08-1699)

LTC4002-4.2 400242i UPACKAGE DESCRIPTIO 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .016 – .050 (0.406 – 1.270) .010 – .020 0°– 8° TYP .008 – .010 (0.203 – 0.254) SO8 0303 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) .050 (1.270) BSC 1 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 8 7 6 5 .189 – .197 (4.801 – 5.004) NOTE 3 .228 – .244 (5.791 – 6.197) .245 MIN .160 –.005 RECOMMENDED SOLDER PAD LAYOUT .045 –.005 .050 BSC .030 –.005 TYP INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

LTC4002-4.2 400242i Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com ª LINEAR TECHNOLOGY CORPORATION 2003 LT/TP 0603 1K PRINTED IN USA PART NUMBER DESCRIPTION COMMENTS LTC1732/LTC4050 Constant Voltage/Constant Current Li-Ion Linear Standalone Battery Charger, No uC or Firmware Required, Auto Battery Chargers Recharge of Low Battery, 10-Pin MSOP, Input Supply Detection LTC1733 Li-Ion Battery Charger with Termal Regulation Standalone Charger, Constant-Current/Constant-Voltage/ Constant-Temperature, Integrated MOSFET, No External Sense Resistor or Blocking Diodes LTC1734/LTC1734L SOT-23 Li-Ion Battery Chargers Need Only Two External Components, Monitors Charge Current, No Reverse Diode or Sense Resistor Required, 50mA to 700mA LTC1980 Combination Battery Charger and DC/DC Converter Wall Adapter May Be Above or Below Battery Voltage, Standalone, 1-, 2-Cell Li-Ion, Also for Charging NiMH and NiCd Batteries LTC4006/LTC4007 4A Multiple Cell Li-Ion, NiCd, NiMH, Lead Acid 6V £ VIN £ 28V, High Efficiency ‡ 90%, VOUT £ 28V, LTC4008 Battery Chargers Digital Interface I/O, Small Inductor LTC4052/LTC1730 Integrated Pulse Chargers for a 1-Cell Li-Ion Battery 0.35 W Internal N-FET Requires No Blocking Diode, Current Limit for Safety LTC4053 USB Compatible Li-Ion Linear Battery Charger Charges from USB Input or AC/DC, 100mA/500mA Up to 1.25A, Thermal Regulation, Fully Integrated LTC4054 Standalone Linear Li-Ion Battery Charger Thermal Regulation Prevents Overheating, C/10 Termination, with Integrated Pass Transistor in ThinSOT TM C/10 Indicator LTC4056 Standalone SOT-23 Li-Ion Linear Battery Charger Charge Termination Included, I CH £ 700mA, 8-Lead ThinSOT Package LTC4412 Low Loss PowerPath TM Controller in ThinSOT Automatic Switching Between DC Sources, Simplified Load Sharing PowerPath and ThinSOT are trademarks of Linear Technology Corporation. TYPICAL APPLICATIO U Single Cell 4.2V, 2A Li-Ion Battery Charger 6.8µH B330-13 1/2 Si9933ADY 1/2 Si9933ADY 22µF CER

400242 TA01

NTC: DALE NTHS-1206N02 10µF CER 0.1µF CER 0.47µF 2.2k RSENSE 50mΩ Li-Ion BATTERY 10k NTC SENSE GATE 3 BAT CHRG LTC4002ES8-4.2 VCC VIN 5V TO 12V NTC GND COMP 100k T RELATED PARTS