LTC1760 Dual Smart Battery System Manager

1 LTC176011760fcFor more information APPLICATION FEATURESDESCRIPTIONDual Smart Battery System ManagerThe LT C 1760 Smart Battery System Manager is a highly- integrated SMBus Level 3 Battery charger and selector intended for products using dual Smart batteries. Three SMBus interfaces allow the LTC1760 to servo to the internal voltage and currents measured by the batteries while allowing an SMBus Host device to monitor either Battery s status. Charging accuracy is determined by the Battery s internal voltage and current measurements, typically better than A proprietary PowerPath architecture supports simultane-ous charging or discharging of both batteries. Typical Battery run times are extended by up to 10%, while charging times are reduced by up to 50%.

2 The LTC1760 automatically switches between power sources in less than 10 s to prevent power interruption upon Battery or wall adapter LTC1760 implements all elements of a version Smart Battery System Manager except for the generation of composite Battery information. An internal multiplexer cleanly switches the SMBus Host to either of the two attached Smart Batteries without generating partial mes-sages to batteries or SMBus Host. Thermistors on both batteries are automatically monitored for temperature and disconnection information (SafetySignal).Dual vs Sequential ChargingAPPLICATIONSn SMBus Charger/Selector for Two Smart Batteries*n Voltage and Current Accuracy within of Value Reported by Batteryn Simplifies Construction of Smart Battery System Manager n Includes All SMBus Charger Safety Featuresn Supports Autonomous Operation without a Hostn Allows Both Batteries to Discharge Simultaneously into Single Load with Low Loss (Ideal Diode) n SMBus Switching for Dual Batteries with Alarm Monitoring for Charging Battery at All Timesn Pin Programmable Limits for Maximum Charge Current and Voltage Improve Safetyn Fast Autonomous PowerPath Switching (<10 s)

3 N Low Loss Simultaneous Charging of Two Batteriesn >95% Efficient Synchronous Buck Chargern AC Adapter Current Limiting* Maximizes Charge Raten SMBus Accelerator Improves SMBus Timing**n Available in 48-Lead TSSOP Packagen Portable Computers and Instrumentsn Standalone Dual Smart Battery Chargersn Battery Backup SystemsLTC1760 DCINSYSTEMPOWERSMBus (HOST)1760 TA01 SafetySignal 1 SMBus 1 SafetySignal 2 SMBus 2 TIME (MINUTES) Battery CURRENT (mA)350030002500200015001000500035003000 250020001500100050001760 TA03050100150200250300 BAT1 CURRENTBAT2 CURRENTSEQUENTIALDUALBAT1 CURRENT100 MINUTESBATTERY TYPE: Li-Ion (MOLTECH NI2020)REQUESTED CURRENT = 3 AREQUESTED VOLTAGE = CHARGER CURRENT = Battery Charger/Selector System ArchitectureL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Analog Devices, Inc.

4 All other trademarks are the property of their respective owners. Protected by Patents including *5723970 ** more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSDCIN, SCP, SCN, CLP, VPLUS, SW to GND .. to 32 VSCH1, SCH2 to GND .. to 28 VBOOST to GND .. to 37 VCSP, CSN, BAT1, BAT2 to GND .. to 28 VLOPWR, DCDIV to GND .. to 10 VVCC2, VDDS to GND .. to 7 VSDA1, SDA2, SDA, SCL1, SCL2, SCL, SMBALERT to GND .. to 7 VMODE to GND .. to VCC2 + COMP1 to GND .. to 5 VMaximum DC Current Into Pin SDA1, SDA2, SDA, SCL1, SCL2, SCL .. 3mA TH1A, TH2A .. 5mA TH1B, TH2B .. 102 AOperating Junction Temperature Range (Note 6) .. 40 C to 125 CStorage 65 C to 150 CLead Temperature (Soldering, 10 sec) ..300 C(Note 1)12345678910111213141516171819202122232 4 TOP VIEWFW PACKAGE48-LEAD PLASTIC TSSOP48474645444342414039383736353433323 1302928272625 SCH2 GCH2 GCH1 SCH1 TGATEBOOSTSWDCINVCCBGATEPGNDCOMP1 CLPCSPCSNVLIMITILIMITTH1 BTH1 ASMBALERTTH2 ATH2 BMODEVCC2 VPLUSBAT2 BAT1 SCNSCPGDCOGDCIGB1 OGB1 IGB2 OGB2 ILOPWRVSETITHISETDCDIVSCL2 SCLSCL1 VDDSSDA2 SDASDA1 GND TJMAX = 125 C, qJA = 110 C/WORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGELTC1760 CFW#PBFLTC1760 CFW#TRPBFLTC1760 CFW48-Lead Plastic TSSOP0 C to 85 CLTC1760 IFW#PBFLTC1760 IFW#TRPBFLTC1760 IFW48-Lead Plastic TSSOP 40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

5 Consult LTC Marketing for information on non-standard lead based finish 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 suffix.( #orderinfo)LTC176031760fcFor more information CHARACTERISTICSSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSS upply and ReferenceDCIN Operating RangeDCIN Selected628 VICH0 ICH1 DCIN Operating CurrentNot Charging (DCIN Selected) (Note 10) Charging (DCIN Selected) (Note 10)1 2mA mAIVCC2_AC1 IVCC2_AC0 VCC2 Operating CurrentAC Present (Note 11) AC Not Present (Note 11) 751 100mA ABattery Operating Voltage RangeBattery Selected, PowerPath Function Battery Selected, Charging Function (Note 2)6 028 28V VIBATB attery Drain CurrentBattery Selected, Not Charging, VDCIN = 0V (Note 10)175 A VFDC VFB1 VFB2 VFSCNVPLUS Diodes Forward Voltage.

6 DCIN to VPLUS BAT1 to VPLUS BAT2 to VPLUS SCN to VPLUS IVCC = 10mA IVCC = 0mA IVCC = 0mA IVCC = 0mA V V V VUVLOU ndervoltage Lockout ThresholdVPLUS Ramping Down, Measured at VPLUS to GNDl35 VVVCCVCC Regulator Output Load RegulationNo External Connection Beyond Applications Shown RegulatorVTOLV oltage AccuracyWith Respect to Voltage Reported by Battery VCHMIN < Requested Voltage < VLIMITl 3232mVITOLC urrent AccuracyWith Respect to Current Reported by Battery 4mV/RSENSE < Requested Current < ILIMIT (Min) (Note 12) RILIMIT = 0 (Short to GND) RILIMIT = 10k 1% RILIMIT = 33k 1% RILIMIT = Open (or Short ILIMIT to VCC2) l l l l 2 4 8 8 2 4 8 8 mA mA mA mAf0 SCRegulator Switching Frequency255300345kHzfDORegulator Switching Frequency in Low Dropout ModeDuty Cycle 99%2025kHzDCMAXR egulator Maximum Duty Current Sense ThresholdVITH = Input Bias CurrentVCSP = VCSN > 5V150 ACMSLCA1 Input Common Mode Low0 VCMSHCA1 Input Common Mode HighVDCIN Turn-On Threshold C-Grade (Note 6) I-Grade (Note 6) l l95 94 90100 100 100105 108 108mV mV mV TG tr TG trTGATE Transition Time.

7 TGATE Rise Time TGATE Fall Time CLOAD = 3300pF, 10% to 90% CLOAD = 3300pF, 10% to 90% 50 50 90 90ns ns BG tr BG tfBGATE Transition Time BGATE Rise Time BGATE Fall Time CLOAD = 3300pF, 10% to 90% CLOAD = 3300pF, 10% to 90% 50 40 90 80 ns ns The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 6). VDCIN = 20V, VBAT1 = 12V, VBAT2 = 12V, VVDDS = , VVCC2 = unless otherwise more information PointsVTRDCDIV/LOPWR ThresholdVDCDIV or VLOPWR Falling C-Grade (Note 6) I-Grade (Note 6) l l V VVTHYSDCDIV/LOPWR Hysteresis VoltageVDCDIV or VLOPWR Rising30mVIBVTDCDIV/LOPWR Input Bias CurrentVDCDIV or VLOPWR = Comparator ThresholdVSCP VSCN, VCC 5V C-Grade (Note 6) I-Grade (Note 6) l l 90 88 100 100 115 115 mV mVVFTOFast PowerPath Turn-Off ThresholdVDCDIV Rising from Shutdown Threshold as a Percent of Programmed Charger VoltageVSET Rising from until TGATE and BGATE Stop Switching107%DACsIRESIDAC ResolutionGuaranteed Monotonic10 Bits tIP tILOWIDAC Pulse Period.

8 Normal Mode Wake-Up Mode 6 10 50 15 s msCharging Current GranularityRILIMIT = 0 (Short ILIMIT to GND) RILIMIT = 10k 1% RILIMIT = 33k 1% RILIMIT = Open (or Short ILIMIT to VCC2 )1 2 4 4mA mA mA mAIWAKE_UPWake-Up Charging Current (Note 5) 6080100mAILIMITC harging Current LimitC-Grade (Note 6) RILIMIT = 0 (Short ILIMIT to GND) RILIMIT = 10k 1% RILIMIT = 33k 1% RILIMIT = Open (or Short ILIMIT to VCC2 )I-Grade (Note 6) RILIMIT = 0 (Short ILIMIT to GND) RILIMIT = 10k 1% RILIMIT = 33k 1% RILIMIT = Open (or Short ILIMIT to VCC2 ) l l l ll l l l 980 1960 2490 3920930 1870 2380 3750 1000 2000 3000 40001000 2000 3000 4000 1070 2140 3210 42801110 2220 3320 4430 mA mA mA mAmA mA mA mAVRESVDAC ResolutionGuaranteed Monotonic (5V < VBAT < 25V)11 BitsVSTEPVDAC Granularity16mVVLIMITC harging Voltage Limit (Note 7)RVLIMIT = 0 (Short VLIMIT to GND) RVLIMIT = 10k 1% RVLIMIT = 33k 1% RVLIMIT = 100k 1% RVLIMIT = Open (or Short VLIMIT to VCC2 )(Note 13)

9 L l l l l8400 12608 16832 210248432 12640 16864 21056 327688464 12672 16896 21088mV mV mV mV mVCharge MUX SwitchestONCGCH1/GCH2 Turn-On TimeVGCHX VSCHX > 3V, CLOAD = 3000pF510mstOFFCGCH1/GCH2 Turn-Off TimeVGCHX VSCHX < 1V, from Time of VCSN < VBATX 30mV, CLOAD = 3000pF15 sVCONCH Gate Clamp Voltage GCH1 GCH2 ILOAD = 1 A VGCH1 VSCH1 VGCH2 VSCH2 5 5 7 7 V VELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 6). VDCIN = 20V, VBAT1 = 12V, VBAT2 = 12V, VVDDS = , VVCC2 = unless otherwise more information Gate Off Voltage GCH1 GCH2 ILOAD =10 A VGCH1 VSCH1 VGCH2 VSCH2 0 0 V VVTOCCH Switch Reverse Turn-Off VoltageVBATX VCSN, 5V VBATX 28V C-Grade (Note 6) I-Grade (Note 6) l l 5 2 20 20 40 40 mV mVVFCCH Switch Forward Regulation VoltageVCSN VBATX, 5V VBATX 28Vl153560mV IOC(SRC) IOC(SNK)GCH1/GCH2 Active Regulation.

10 Max Source Current Max Sink CurrentVGCHX VSCHX = 2 2 A AVCHMINBATX Voltage Below Which Charging is Inhibited(Note 14) SwitchestD LYBlanking Period after UVLO TripSwitches Held Off250mstPPBB lanking Period after LOPWR TripSwitches in 3-Diode Mode1sectONPOGB1O/GB2O/GDCO Turn-On TimeVGS < 3V, from Time of Battery /DC Removal, or LOPWR Indication, CLOAD = 3000pFl510 stOFFPOGB1O/GB2O/GDCO Turn-Off TimeVGS > 1V, from Time of Battery /DC Removal, or LOPWR Indication, CLOAD = 3000pFl37 sVPONOO utput Gate Clamp Voltage GB1O GB2O GDCOILOAD = 1 A Highest (VBAT1 or VSCP) VGB1O Highest (VBAT2 or VSCP) VGB2O Highest (VDCIN or VSCP) VGDCO 7 7 7 V V VVPOFFOO utput Gate Off Voltage GB1O GB2O GDCOILOAD = 25 A Highest (VBAT1 or VSCP) VGB1O Highest (VBAT2 or VSCP) VGB2O Highest (VDCIN or VSCP) VGDCO V V VVTOPP owerPath Switch Reverse Turn-Off VoltageVSCP VBATX or VSCP VDCIN 6V VSCP 28V C-Grade (Note 6) I-Grade (Note 6) l l 5 2 20 20 60 60 mV mVVFPP owerPath Switch Forward Regulation VoltageVBATX VSCP or VDCIN VSCP 6V VSCP 28Vl02550mV IOP(SRC) IOP(SNK)GDCI/GB1I/GB2I Active Regulation.