资料课件讲义芯片手册ltc4002

1、LTC4002Standalone Li-Ion Switch Mode Battery ChargerFEATURESDESCRIPTIOThe LTC4002 is a complete battery charger controller for one (4.2V) or two (8.4V) cell lithium-ion batteries. With a 500kHz switching frequency, the LTC4002 provides a small, simple and efficient solution to fast charge Li-Ion bat

2、teries from a wide range of supply voltages. An external sense resistor sets the charge current with ?5% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ?1% accuracy.When the input supply is removed, the LTC4002 automati- cally enters

3、a low current sleep mode, dropping the battery draincurrentto10?A.Aninternalcomparatordetectsthe near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. After the charge cycle ends, if the battery voltage drops below 4.05V per cell, a new char

4、ge cycle will automatically begin.TheLTC4002isavailableinthe8-leadSOand10-leadDFN packages.Wide Input Supply Range: 4.7V to 22V 4.2 Version 8.9V to 22V 8.4 VersionHigh Efficiency Current Mode PWM Controller with 500kHz Switching Frequency?1% Charge Voltage AccuracyEnd-of-Charge Current Detection Out

5、put 3 Hour Charge Termination TimerConstant Switching Frequency for Minimum Noise?5% Charge Current AccuracyLow 10?A Reverse Battery Drain Current Automatic Battery RechargeAutomatic Shutdown When Input Supply is Removed Automatic Trickle Charging of Low Voltage Batteries Battery Temperature Sensing

6、 and Charge QualificationStable with Ceramic Output Capacitor 8-Lead SO and 10-Lead DFN Packages, LTC and LT are registered trademarks of Linear Technology Corporation.All other trademarks are the property of their respective owners.APPLICATIOSPortable Computers Charging Docks Handheld InstrumentsTY

7、PICAL APPLICATIO1.5A Single Cell Li-Ion Battery ChargerVIN5V TO 22VEfficiency vs Input Voltage100(CURVES INCLUDE INPUT DIODE)90VBAT =4V0.1?F10?FVCCBATGATE80VBAT = 3.8V2kLTC4002ES8-4.2CHARGE STATUS6.8?H70CHRGSENSE68mW60COMPBAT510152025NTCGND+ Li-IonINPUT VOLTAGE (V)0.47?F22?FBATTERY4002 TA022.2kT 10k

8、4002 TA01NTCNTC: DALE NTHS-1206N024002f1EFFICIENCY (%)LTC4002ABSOLUTEAXIURATI GS(Note 1)Operating Temperature Range (Note 4) . 40?C to 85?C Storage Temperature Range65?C to 125?CSupply Voltage (VCC)VGATE(VCC 8V) to VCCBAT, SENSE. V to 14VLead Temperature (S8 Package)(Soldering, 10 sec)300?CCHRG, NTC

9、V to 8VPACKAGE/ORDER IFORATIOConsult LTC Marketing for parts specified with wider operating temperature ranges.ELECTRICAL CHARACTERISTICS(LTC4002-4.2) The denotes the specifications which apply over the fulloperating temperature range, otherwise specifications are at TA = 25?C. VCC = 10V unless othe

10、rwise noted.DC Characteristics4002f2VCCVCC Supply Voltage4.722VICCVCC Supply CurrentCurrent Mode Shutdown Mode Sleep Mode35351020mA mA?AVBAT(FLT)Battery Regulated Float Voltage5V VCC 22V (Note 2)4.1684.24.2324.1584.242V VVSNS(CHG)Constant Current Sense Voltage3V VBAT 4V (Note 3)0?C TA 85?C40?C TA 85

11、?C9310010790110mV mVVSNS(TRKL)Trickle Current Sense VoltageVBAT = 0V (Note 3)51015mVVTRKLTrickle Charge Threshold VoltageVBAT Rising2.752.93.05VVUVVCC Undervoltage Lockout Threshold VoltageVCC Rising3.94.24.5VDVUVVCC Undervoltage Lockout Hysteresis Voltage200mVVMSDManual Shutdown Threshold VoltageCO

12、MP Pin Falling200360500mVVASDAutomatic Shutdown Threshold VoltageVCC VBAT250mVICOMPCOMP Pin Output CurrentVCOMP = 1.2V100?AICHRGCHRG Pin Weak Pull-Down CurrentVCHRG = 1V152535?AVCHRGCHRG Pin Output Low VoltageICHRG = 1mA0.150.3VREOCEnd-of-Charge RatioVSNS(EOC)/VSNS(CHG)102532%tTIMERCharge Time Accur

13、acy10%SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSTOP VIEWCOMPNCVCCNTCGATESENSEPGNDBATSGNDCHRGDD PACKAGE10-LEAD (3mm ? 3mm) PLASTIC DFN TJMAX = 125?C, qJA = 43?C/W EXPOSED PAD IS GND (PIN 11) MUST BE SOLDERED TO PCBORDER PART NUMBERTOP VIEWCOMPNTCVCCSENSEGATEBATGNDCHRGS8 PACKAGE8-LEAD PLASTIC SO TJMAX =

14、125?C, qJA = 110?C/WORDER PART NUMBERLTC4002EDD-4.2 LTC4002EDD-8.4LTC4002ES8-4.2 LTC4002ES8-8.4DD PART MARKINGS8 PART MARKINGLAGG LBGY400242400284182736451111029384756LTC4002ELECTRICAL CHARACTERISTICS(LTC4002-4.2) The denotes the specifications which apply over the fulloperating temperature range, o

15、therwise specifications are at TA = 25?C. VCC = 10V unless otherwise noted.OscillatorGate Drive(LTC4002-8.4) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25?C. VCC = 12V unless otherwise noted.DC Characteristics4002f3VCCVC

16、C Supply Voltage8.922VICCVCC Supply CurrentCurrent Mode Shutdown Mode Sleep Mode35351020mA mA?AVBAT(FLT)Battery Regulated Float Voltage9V VCC 22V (Note 2)8.3368.48.4648.3168.484V VVSNS(CHG)Constant Current Sense Voltage6V VBAT 8V (Note 3)9510010593100107mV mVVSNS(TRKL)Trickle Current Sense VoltageVB

17、AT = 0V (Note 3)51015mVVTRKLTrickle Charge Threshold VoltageVBAT Rising4.755.3VVUVVCC Undervoltage Lockout Threshold VoltageVCC Rising7.58.5VDVUVVCC Undervoltage Lockout Hysteresis Voltage500mVVMSDManual Shutdown Threshold VoltageCOMP Pin Falling200350500mVVASDAutomatic Shutdown Threshold VoltageVCC

18、 VBAT250mVICOMPCOMP Pin Output CurrentVCOMP = 1.2V100?AICHRGCHRG Pin Weak Pull-Down CurrentVCHRG = 1V152535?AVCHRGCHRG Pin Output Low VoltageICHRG = 1mA0.150.3VREOCEnd-of-Charge RatioVSNS(EOC)/VSNS(CHG)51015%tTIMERCharge Time Accuracy10%INTCNTC Pin Output CurrentVNTC = 0.85V758595?ASYMBOLPARAMETERCO

19、NDITIONSMINTYPMAXUNITStrRise TimeCGATE = 2000pF, 10% to 90%20nstfFall TimeCGATE = 2000pF, 90% to 10%50nsDVGATEOutput Clamp VoltageVCC VGATE, VCC 9V8VDVGATEHIOutput High VoltageDVGATEHI = VCC VGATE, VCC 7V0.3VDVGATELOOutput Low VoltageDVGATELO = VCC VGATE, VCC 7V4.5VfOSCSwitching Frequency450500550kH

20、zDCMaximum Duty Cycle100%SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSINTCNTC Pin Output CurrentVNTC = 0.85V758595?AVNTC-HOTNTC Pin Threshold Voltage (Hot)VNTC Falling Hysteresis34035537025mV mVVNTC-COLDNTC Pin Threshold Voltage (Cold)VNTC Rising Hysteresis2.4282.4652.502170VmVDVRECHRGRecharge Battery Vol

21、tage Offset from Full Charged Battery VoltageVBAT(FULLCHARGED) VRECHRG, VBAT Falling100150200mVILEAKCHRG Pin Leakage CurrentVCHRG = 8V, Charging Stops1?ALTC4002ELECTRICAL CHARACTERISTICS(LTC4002-8.4) The denotes the specifications which apply over the fulloperating temperature range, otherwise speci

22、fications are at TA = 25?C. VCC = 12V unless otherwise noted.OscillatorGate DriveNote 1: Absolute Maximum Rating are those values beyond which the life of a device may be impaired.Note2: The LTC4002 is testedwith Test Circuit 1.Note3: The LTC4002 is testedwith Test Circuit 2.Note 4: The LTC4002is gu

23、aranteed tomeet performancespecifications from 0?Cto 70?C. Specifications overthe40?Cto 85?Coperating temperature range are assured by design, characterization and correlation with statistical process controls.TYPICAL PERFORACE CHARACTERISTICSTA = 25?C, VCC = 10V unless otherwise noted.Oscillator Fr

24、equency vs TemperatureSupply Current vs TemperatureSupply Current vsVCC4.045503.535003.02.52450025 5075100TEMPERATURE (?C)125250255075 100 125502551015VCC (V)202550TEMPERATURE (?C)4002 G014002 G034002 G024002f4ICC (mA)ICC (mA)fOSC (kHz)CURRENT MODEtrRise TimeCGATE = 2000pF, 10% to 90%20nstfFall Time

25、CGATE = 2000pF, 90% to 10%50nsDVGATEOutput Clamp VoltageVCC VGATE8VDVGATEHIOutput High VoltageDVGATEHI = VCC VGATE0.3VDVGATELOOutput Low VoltageDVGATELO = VCC VGATE4.5VfOSCSwitching Frequency450500550kHzDCMaximum Duty Cycle100%SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSVNTC-HOTNTC Pin Threshold Voltage

26、(Hot)VNTC Falling Hysteresis34035537025mV mVVNTC-COLDNTC Pin Threshold Voltage (Cold)VNTC Rising Hysteresis2.4282.4652.502170VmVDVRECHRGRecharge Battery Voltage Offset from Full Charged Battery VoltageVBAT(FULLCHARGED) VRECHRG, VBAT Falling200300400mVILEAKCHRG Pin Leakage CurrentVCHRG = 8V, Charging

27、 Stops1?ALTC4002TYPICAL PERFORACE CHARACTERISTICS TA = 25?C, VCC = 10V unless otherwise noted.Undervoltage Lockout Threshold vs TemperatureCHRG Pin Output Low Voltage vs VCCOscillator Frequency vs VCC5101508750061405490413051015VCC (V)202550250255075100 12551015VCC (V)2025TEMPERATURE (?C)4002 G04400

28、2 G054002 G06CHRG Pin Output Low Voltage vs TemperatureCHRG Pin Weak Pull-Down Current vs TemperatureCHRG Output Pin Weak Pull-Down Current vs VCC1802928140252510021225025025507510012550250255075100 12551015VCC (V)2025TEMPERATURE (?C)TEMPERATURE (?C)4002 G074002 G084002 G09Recharge Voltage Offset Pe

29、r Cell from Full Charged Voltage vs TemperatureRecharge Voltage Offset from Full Charged Voltage vs VCCRecharge Voltage Offset from Full Charged Voltage vs VCC190160320300150150110140280515VCC (V)202550250255075100 12551015VCC (V)202510TEMPERATURE (?C)4002 G124002f4002 G104002 G115DVRECHRG/CELL (mV)

30、VCHG (mV)fOSC (kHz)DVRECHRG (mV)ICHRG(?A)VUV (V)DVRECHRG (mV)VCHRG (mV)ICHRG(?A)LTC4002-8.4LTC4002-4.2VCHRG = 8VVCHRG = 8VILOAD = 1mAILOAD = 1mAVCC RISINGLTC4002-8.4LTC4002-4.2LTC4002TYPICAL PERFORACE CHARACTERISTICS TA = 25?C, VCC = 10V unless otherwise noted.CurrentMode Sense Voltage vs VCCCurrent

31、Mode Sense Voltage vs VCCCurrent Mode Sense Voltage vs Temperature1021021041001001009698985025025507510012551015VCC (V)202551015VCC (V)2025TEMPERATURE (?C)4002 G134002 G144002 G15COMP Pin Output Current vs VCCCOMP Pin Output Current vs TemperatureNTC Pin Output Current vs VCC102861041001008598968451

32、015VCC (V)202550250255075100 12551015VCC (V)2025TEMPERATURE (?C)4002 G164002 G174002 G18TrickleChargeVoltage vs TemperatureTrickleChargeVoltage vs VCCTrickleChargeVoltage vs Temperature3.03.05.22.92.95.02.82.84.850250255075 100 12551015VCC (V)202550250255075 100 125TEMPERATURE (?C)TEMPERATURE (?C)40

33、02 G194002 G204002 G214002f6ICOMP (?A)VTRKL (V)VSNS (mV)VSNS (mV)VTRKL (V)ICOMP (?A)INTC (?A)VSNS (mV)VTRKL (V)LTC4002-8.4LTC4002-4.2LTC4002-4.2VNTC= 0VVCOMP =0VVCOMP = 0VVBAT = 8V LTC4002-8.4VBAT = 4V LTC4002-4.2LTC4002TYPICAL PERFORACE CHARACTERISTICS TA = 25?C, VCC = 10V unless otherwise noted.Tr

34、ickle Charge Voltage vs VCCTrickleChargeSense Voltage vs TemperatureTrickleChargeSense Voltage vs VCC5.210.4115.010.0104.89.6951015VCC (V)202550250255075100125515VCC (V)202510TEMPERATURE (?C)4002 G224002 G234002 G24NTC Pin Output Current vs TemperatureTrickleChargeSense Voltage vs TemperatureTrickle

35、ChargeSense Voltage vs VCC10.4118910.010859.681950250255075 100125515VCC (V)202550250255075100 12510TEMPERATURE (?C)TEMPERATURE (?C)4002 G254002 G264002 G27End-of-Charge Ratio vs TemperatureEnd-of-Charge Ratio vs VCC29282525212250250255075 10012551015VCC (V)2025TEMPERATURE (?C)4002 G284002 G294002f7

36、VSNS (mV)VTRKL (V)REOC (%)VSNS (mV)VSNS (mV)REOC (%)INTC (?A)VSNS (mV)LTC4002-4.2LTC4002-4.2VNTC = 0VVBAT = 4V LTC4002-8.4VBAT = 4V LTC4002-8.4VBAT = 2.5V LTC4002-4.2VBAT = 2.5V LTC4002-4.2LTC4002-8.4LTC4002TYPICAL PERFORA CECHARACTERISTICS TA= 25?C,VCC =10Vunlessotherwisenoted.End-of-Charge Ratio v

37、s TemperatureEnd-of-Charge Ratio vs VCC1414131312121111101099887766250255075 100 12551015VCC (V)202550TEMPERATURE (?C)4002 G304002 G31PIFU CTIO S (DFN/SO-8)COMP (Pin 1/Pin 1): Compensation, Soft-Start and Shut- down Control Pin. The COMP pin is the control signal of the innerloopofthecurrentmodePWM.

38、Chargingbeginswhen theCOMPpinreaches800mV.Therecommendedcompen- sation components are a 0.47?F (or larger) capacitor and a 2.2k series resistor. A 100?A current into the compen- sation capacitor alsosetsthe soft-start slewrate. Pulling the COMP pin below 360mV will shut down the charger.VCC (Pin 2/P

39、in 2): Positive Supply Voltage Input. VCC can range from VBAT(FLT) + 0.5V to 22V. A 0.1?For higherca- pacitorisrequired atthe VCCpin with thelead lengthkept toaminimum. A10?Flow ESRcapacitor isalso required at the source pins of the power P-channel MOSFET.GATE (Pin 3/Pin 3): Gate Drive Output. Drive

40、r Output for theP-ChannelMOSFET.Thevoltageatthispinisinternally 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/Pin 4): IC Ground. The exposed pad (DFN) must be soldered to PCB ground to

41、 provide both electrical contact and optimum thermal performance.CHRG (Pin 6/Pin 5): Open-Drain Charge Status Output.current drops below the End-of-Charge threshold for more than120?s,the N-channel MOSFET turnsoffanda 25?A current source is connected from the CHRGpin to GND. When the timer runs out

42、or the input supply is removed, the 25?A 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?F is required to minimize ripple voltage. An internal resistor divider, which is disconnected in sleep mode, sets the final

43、 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 VCC, the LTC4002 is forced into sleep mode, dropping ICC to 10?A.SENSE(Pin8/Pin7):Current

44、AmplifierSenseInput.Asense resistor, RSENSE, must be connected between the SENSE and BAT pins. The maximum charge current is equal to 100mV/RSENSE.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