LT8490 - High Voltage, High Current Buck-Boost …

1 LT849018490faFor more information applicaTion FeaTuresDescripTionHigh Voltage, High Current Buck-Boost Battery charge controller with Maximum Power Point Tracking (MPPT)The LT 8490 is a Buck-Boost switching regulator battery charger that implements a constant- Current constant-voltage (CCCV) charging profile used for most battery types, including sealed lead-acid (SLA), flooded, gel and lithium-ion. The device operates from input voltages above, below or equal to the output voltage and can be powered by a solar panel or a DC power supply. On-chip logic provides automatic maximum power point tracking (MPPT) for solar powered applications. The LT8490 can perform automatic temperature compensation by sensing an external thermistor thermally coupled to the battery. STATUS and FAULT pins containing charger information can be used to drive LED indicator lamps.

2 The device is available in a low profile ( ) 7mm 11mm 64-lead QFN Solar Powered Battery Charger SchematicapplicaTions nVIN Range: 6V to 80V nVB AT Range: to 80V nSingle Inductor Allows VIN Above, Below, or Equal to VB AT nAutomatic MPPT for Solar Powered Charging nAutomatic Temperature Compensation nNo Software or Firmware Development Required nOperation from Solar Panel or DC Supply nInput and Output Current Monitor Pins nFour Integrated Feedback Loops nSynchronizable Fixed Frequency: 100kHz to 400kHz n64-Lead (7mm 11mm ) QFN Package nSolar Powered Battery Chargers nMultiple Types of Lead-Acid Battery Charging nLi-Ion Battery Charger nBattery Equipped Industrial or Portable Military EquipmentL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective owners. LT8490 SOLAR PANELTG1 BOOST1 CSNINCSPINVINCSPOUTCSNOUTEXTVCCAVDDTEMPS ENSEGATEVCCINTVCCSW1 BG1 CSP CSNSTATUSFAULTAVDDBG2 SW2 BOOST2 TG2 GNDRECHARGABLEBATTERYLOADTHERMISTOR+ 8490 TA01aAVDDGATEVCC GATEVCC GATEVCC VBAT8490 PAGE APPLICATIONPERTURB &OBSERVEPERTURB &OBSERVEFULL PANEL SCANM aximum Power Point TrackingLT849028490faFor more information conFiguraTionabsoluTe MaxiMuM raTingsVCSP VCSN, VCSPIN VCSNIN,VCSPOUT VCSNOUT .. to , CLKOUT, CSP, CSN Voltage .. to 3 VVC Voltage (Note 2) .. to , VDD, AVDD Voltage .. to 5 VRT, FBOUT Voltage .. to 5 VIMON_IN, IMON_OUT Voltage .. to 5 VSYNC Voltage .. to , GATEVCC Voltage .. to 7 VVBOOST1 VSW1, VBOOST2 VSW2 .. to 7 VSWEN, MODE Voltage .. to 7 VSRVO_FBIN, SRVO_FBOUT Voltage.

4 To 30 VSRVO_IIN, SRVO_IOUT Voltage .. to 30 VFBIN, SHDN Voltage .. to 30 VCSNIN, CSPIN, CSPOUT, CSNOUT Voltage .. to 80 VVIN, EXTVCC Voltage .. to 80 VSW1, SW2 Voltage ..81V (Note 5)BOOST1, BOOST2 Voltage .. to 87 VBG1, BG2, TG1, TG2 ..(Note 4)IOW, ECON, CLKDET Voltage .. to VDD + , STATUS Voltage .. to VDD + , FBIW, FAULT Voltage .. to VDD + , FBOR, IIR, IOR Voltage .. to VDD + to VDD + , CHARGECFG1 Voltage .. to VDD + Junction Temperature Range LT849 0E (Notes 1, 3) .. 40 C to 125 C LT849 0I (Notes 1, 3) .. 40 C to 125 CStorage Temperature Range .. 65 C to 150 C(Note 1)TOP VIEWUKJ PACKAGE64-LEAD (7mm 11mm) PLASTIC QFN65 GNDFBIR 1 FAULT 2 TEMPSENSE 3 VDD 4 FBOW 5 FBIW 6 INTVCC 7 SWEN 8 MODE 9 IMON_IN 10 SHDN 11 CSN 12 CSP 13 LDO33 14 FBIN 15 FBOUT 16 IMON_OUT 17 VC 18SS 19 CLKOUT 2052 NC51 STATUS50 IOW49 SWENO48 ECON46 VIN45 CSPIN44 CSNIN42 CSPOUT41 CSNOUT40 EXTVCC38 SRVO_FBOUT37 SRVO_IOUT36 SRVO_IIN35 SRVO_FBIN33 BOOST164 IOR63 CHARGECFG262 GND61 CHARGECFG160 NC59 GND58 AVDD57 FBOR56 CLKDET55 GND54 VINR53 IIRSYNC 21RT 22BG1 23 GATEVCC 24BG2 25 BOOST2 27TG2 28SW2 29 SW1 31 TG1 32 TJMAX = 125 C, JA = 34 C/W EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCBorDer inForMaTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT8490 EUKJ#PBFLT8490 EUKJ#TRPBFLT8490 UKJ64-Lead (7mm 11mm)

5 Plastic QFN 40 C to 125 CLT8490 IUKJ#PBFLT8490 IUKJ#TRPBFLT8490 UKJ64-Lead (7mm 11mm) Plastic QFN 40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF more information characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

6 VIN = 12V, VDD = AVDD = , SHDN = 3V unless otherwise noted. (Note 3)PARAMETERCONDITIONSMINTYPMAXUNITSV oltage Supply and RegulatorsVIN Operating Voltage Range (Note 7)l680 VVIN Quiescent CurrentNot Switching, VEXTVCC = 0, VDD = AVDD = Quiescent Current in ShutdownVSHDN = 0V01 AVDD Quiescent CurrentIAVDD + IVDD, VDD = AVDD = Switchover VoltageIINTVCC = 20mA, VEXTVCC Switchover Pin Voltage5mA from LDO33 Pin Load RegulationILDO33 = to 5mA 1%LDO33 Pin Current Pin Undervoltage LockoutLDO33 Pin Undervoltage Lockout Hysteresis35mVSwitching Regulator ControlSHDN Input Voltage HighSHDN Rising to Enable the Input Voltage High Hysteresis50mVSHDN Input Voltage LowDevice Disabled, Low Quiescent Pin Bias CurrentVSHDN = 3V VSHDN = 12V0 111 22 A ASWEN Rising Threshold Threshold Voltage Hysteresis22mVMODE Pin ThresholdsDiscontinuous Mode Forced Continuous Model l VIMON_OUT Rising threshold for CCM OperationMODE = 0Vl168195224mVIMON_OUT Falling threshold for DCMMODE = 0Vl95122150mVVoltage RegulationRegulation Voltage for FBOUTVC = , EXTVCC = Voltage for FBINVC = , EXTVCC = Pin Bias CurrentCurrent Out of Pin15nAFBIN Pin Bias CurrentCurrent Out of Pin10nACurrent RegulationRegulation Voltage for IMON_IN and IMON_OUTVC = , EXTVCC = Output CurrentVCSPIN VCSNIN = 50mV, VCSPIN = VCSPIN VCSNIN = 50mV, VCSPIN = VCSPIN VCSNIN = 0mV, VCSPIN = 5V l l54 53 57 760 61 A A AIMON_IN Overvoltage Output CurrentVCSPOUT VCSNOUT = 50mV.

7 VCSPOUT = VCSPOUT VCSNOUT = 50mV, VCSPOUT = VCSPOUT VCSNOUT = 5mV, VCSPOUT = VCSPOUT VCSNOUT = 5mV, VCSPOUT = l 47 50 5 8 A A A AIMON_OUT Overvoltage more information Regulator Oscillator (OSC1)Switch Frequency RangeSyncing or Free Running100400kHzSwitching Frequency, fOSCRT = 365k RT = 215k RT = 124kl l l102 170 310120 202 350142 235 400kHz kHz kHzSYNC High Level for Low Level for Clock Pulse Duty CycleVSYNC = 0V to 2V2080%Recommended Min SYNC Ratio, fSYNC/fOSC3/4 CLKOUT Output Voltage HIGH1mA Out of CLKOUT Output Voltage LOW1mA into CLKOUT Pin25100mVCLKOUT Duty CycleTJ = 40 C TJ = 25 C TJ = 125 77% % %Charging ControlSTATUS, FBOW, FBIW, SWENO, IOW, ECON Output Low VoltageIOL = , FBOW, FBIW, SWENO, IOW, ECON Output High VoltageIOH = 5mA Output Voltage LowIOL = Output Voltage HighIOH = Supply Mode Detection Threshold (Note 6)VINR Pin Fallingl155174mVPower Supply Mode Detection Threshold Hysteresis (Note 6)

8 VINR Pin29mVMinimum VINR Voltage for Start-Up (Note 6)Not in Power Supply Mode Low Power Mode Enabled Low Power Mode Disabled l l 380 213 395 225 410 237 mV mVHigh Charging Current Threshold on IOR (Note 6)IOR Rising g ECON Risingl168195224mVLow Charging Current Threshold on IOR (Note 6)IOR Falling g ECON Fallingl95122150mVMinimum CHARGECFG1 % of AVDD to Disable Stage 3 (Note 6)Temperature Compensation Enabledl949596%Maximum CHARGECFG1 % of AVDD to Disable Stage 3 (Note 6)Temperature Compensation Disabledl456%Minimum CHARGECFG2 % of AVDD to Disable Time Limits (Note 6)Wide Valid Temperature Rangel949596%Maximum CHARGECFG2 % of AVDD to Disable Time Limits (Note 6)Narrow Valid Temperature Rangel456%Minimum TEMPSENSE % of AVDD to Detect Battery Disconnected (Note 6) VCSNOUT Threshold for C/5 Detection (Note 6)VCSxOUT Common Mode = , RTOTAL from IMON_OUT to Ground = 91011mVVCSPOUT VCSNOUT Threshold for C/10 Detection (Note 6)VCSxOUT Common Mode = , IOR Falling, RTOTAL from IMON_OUT to Ground = , FBOW PWM Frequency (OSC2) , FBOW PWM Resolution8 BitsSTATUS UART Bit Rate l216024002640 BaudInternal A/D Resolution10 BitselecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

9 VIN = 12V, VDD = AVDD = , SHDN = 3V unless otherwise noted. (Note 3)LT849058490faFor more information characTerisTicsNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: Do not force voltage on the VC 3: The LT8490E is guaranteed to meet performance specifications from 0 C to 125 C junction temperature. Specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT8490I is guaranteed over the full 40 C to 125 C junction temperature 4: Do not apply a voltage or Current source to these pins. They must be connected to capacitive loads only, otherwise permanent damage may 5: Negative voltages on the SW1 and SW2 pins are limited in the applications by the body diodes of the external NMOS devices M2 and M3 or parallel Schottky diodes when present.

10 The SW1 and SW2 pins are tolerant of these negative voltages in excess of one diode drop below ground, guaranteed by 6: These thresholds are measured by the internal A-D converter. The A-D reference voltage is AVDD. AVDD, VDD and an additional load are regulated by LDO33 to create the AVDD reference for these measurements. The absolute threshold voltages will shift with corresponding changes in the AVDD 7: 10V minimum VIN required for solar powered start-up if low power mode is more information perForMance characTerisTicsSTATUS VOH and VOL (VDD = AVDD = )FAULT VOH and VOL (VDD = AVDD = )LDO33 Load Regulation (Not Connected to AVDD and VDD)IMON Output CurrentsPower Supply Mode Charging Lead Acid Battery "B TA = 25 C, unless otherwise noted.|IFAULT| (mA)0 VFAULT (V)132028490 G0631 40 C125 C 40 C25 CVOHVOL125 C25 CLOAD Current (mA)0 LDO33 (V) G07204121625 C 40 C125 CCSxIN-CSxOUT (mV) 100 PIN Current ( A)0175200125150100507525 250508490 G08200 50100150 IMON_OUTIMON_IN|ISTATUS| (mA)0 VSTATUS (V)1320158490 G0520510 40 C125 C25 C 40 C125 CVOHVOL25 CSTAGE 2 STAGE 1 STAGE 3 CHARGING TIME (HOURS)0 VBAT (V) AND IBAT (A) G0412 VBATBACK PAGE APPLICATIONIBATVIN = 36 VFBOUT, FBIN, IMONIN, IMONOUT Voltage Rise vs PowerINTVCC REGULATOR POWER (W)0 VOLTAGE RISE (%) REGULATEDFROM VININTVCC REGULATEDFROM EXTVCCS olar Powered Charging Lead Acid Battery "A Solar Powered Charging Lead Acid Battery "B Solar Powered Charging Lithium Ion BatteryTIME OF DAY9 AMVBAT (V) AND IBAT (A)