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LTC1760

25

1760fc

For more information

www.linear.com/LTC1760

OPERATION

SMBus DUAL POR

T

SCL

SDA

SCL1

SDA1

SCL2

SDA2

Figure 3. LTC1760 Queries Battery 1 Followed By Battery 2 For Requested Current. (Configuration b)

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Summary of Contents for LTC1760

Page 1: ...Smart Batteries n Voltage and Current Accuracy within 0 2 of Value Reported by Battery n Simplifies Construction of Smart Battery System Manager n Includes All SMBus Charger V1 1 Safety Features n Sup...

Page 2: ...26 25 SCH2 GCH2 GCH1 SCH1 TGATE BOOST SW DCIN VCC BGATE PGND COMP1 CLP CSP CSN VLIMIT ILIMIT TH1B TH1A SMBALERT TH2A TH2B MODE VCC2 VPLUS BAT2 BAT1 SCN SCP GDCO GDCI GB1O GB1I GB2O GB2I LOPWR VSET IT...

Page 3: ...h Respect to Voltage Reported by Battery VCHMIN Requested Voltage VLIMIT l 32 32 mV ITOL Current Accuracy With Respect to Current Reported by Battery 4mV RSENSE Requested Current ILIMIT Min Note 12 RI...

Page 4: ...Current Limit C 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 RIL...

Page 5: ...CO 4 75 4 75 4 75 6 25 6 25 6 25 7 7 7 V V V VPOFFO Output Gate Off Voltage GB1O GB2O GDCO ILOAD 25 A Highest VBAT1 or VSCP VGB1O Highest VBAT2 or VSCP VGB2O Highest VDCIN or VSCP VGDCO 0 18 0 18 0 18...

Page 6: ...nt is Through Internal Series Resistor and Schottky to VCC2 165 220 350 A SCL1 SDA1 SCL2 SDA2 Series Impedance to Host SMBus VSDA1 VSCL1 VSDA2 VSCL2 0 8V l 300 SCL SDA Output Low Voltage VOL LTC1760 D...

Page 7: ...harging Note 3 DCIN BAT1 BAT2 are held at 12V and GDCI GB1I GB2I are forced to 10 5V SCP is set at 12V to measure source current at GDCI GB1I and GB2I SCP is set at 11 9V to measure sink current at GD...

Page 8: ...DUAL BAT1 CURRENT 100 MINUTES BATTERY TYPE 10 8V Li Ion MOLTECH NI2020 REQUESTED CURRENT 3A REQUESTED VOLTAGE 12 3V MAX CHARGER CURRENT 4 1A BAT2 CURRENT BAT2 VOLTAGE BAT2 CURRENT BAT1 CURRENT BAT1 VO...

Page 9: ...TA 25 C LOPWR THRESHOLD 1 s DIV 1760 G11 5V 0V RPULLUP 15k LTC1760 VCC 5V CLD 200pF TA 25 C PIN FUNCTIONS Input Power Related SCN Pin 4 PowerPath Current Sensing Negative Input This pin should be con...

Page 10: ...programs the range and resolution of the voltage DAC CSN Pin 34 Current Amplifier CA1 Input Connect this to the common output of the charger MUX switches CSP Pin 35 Current Amplifier CA1 Input This p...

Page 11: ...l up IPULLUP when required SCL Pin 18 SMBus Clock Signal to SMBus Host Also usedtodetermineflashingrateforstand alonechargeindi cators RequiresanexternalpulluptoVDDS normalSMBus operatingmode Connecte...

Page 12: ...VPLUS BAT2 OSCILLATOR LOW DROP DETECT TON BOOST BGATE VCC PWM LOGIC Q S R 100mV CLP 40mV 15 SCN GB1I GB1O GB2I GB2O GDCI GDCO SCP SCN CSP TH2B TH2A TH1B TH1A CSN ISET CA1 3k 3k 0 8V BUFFERED ITH gm 1...

Page 13: ...Current Limits When Charging A Single Battery 28 3 6 2 Current Limits When Charging Two Batteries TURBO Mode Disabled 28 3 6 3 Current Limits When Charging Two Batteries TURBO Mode Enabled 29 3 7 Con...

Page 14: ...he LOPWR resistor divider then all of the output side PFETs are turned on quickly The input side PFETs act as diodes in this mode and power is taken from the highest voltage source available at the DC...

Page 15: ...D RESERVED RESERVED CALIBRATE_BAT4 CALIBRATE_BAT3 CALIBRATE_BAT2 CALIBRATE_BAT1 RESERVED CALIBRATE CHARGER_POR CHARGING_INHIBIT CALIBRATE_REQUEST CALIBRATE_REQUEST_SUPPORT POWER_NOT_GOOD AC_PRESENT 0...

Page 16: ...14 IR13 IR12 IR11 IR10 IR09 IR08 IR07 IR06 IR05 IR04 IR03 IR02 IR01 IR00 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 ChargingVoltage Master Read 7 bit 0001_011b 8 bit 0 16 0 15 Sta...

Page 17: ...disconnected Polling or SMBALERT TheLTC1760autonomouslychangestheconfigura tion of the batteries supplying power Polling only TheLTC1760autonomouslychangestheconfiguration of the batteries being charg...

Page 18: ...o retrieve additional state information from the LTC1760 and the overall system power configuration It may also be used by the system to prohibit any battery charging SMBus Protocol Read or Write Word...

Page 19: ...s a 0 CALIBRATE Bit The read write CALIBRATE bit is used either to show the status of battery calibration cycles in the LTC1760 or to begin or end a calibration cycle CALIBRATE_BAT 4 1 Nibble The read...

Page 20: ...wed values 1b Turbo charging mode enabled 0b Turbo charging mode disabled Power On Reset Value LTC_Version 3 0 Nibble Thisreadonlynibblealwaysreturns0001bastheLTC1760 version OPERATION 2 3 5 BatteryMo...

Page 21: ...mA 2 3 9 ChargingVoltage 0 15 Description This function is used by the LTC1760 to read the Smart Battery s desired charging voltage Purpose Allows the LTC1760 to determine the maximum charging voltag...

Page 22: ...e Description TheSMBusHostusestheAlertResponseAddress ARA to simultaneously address all devices on the SMBus and de terminewhichdevicesarecurrentlyassertingSMBALERT Purpose This command allows the SMB...

Page 23: ...et on SMB1 and SMB2 as required The four possible configurations are illustrated in Figure 1 Sample SMBus communications are shown in Figures 2 and 3 2 5 LTC1760 SMBus Controller Operation SMBuscommun...

Page 24: ...For more information www linear com LTC1760 OPERATION SMBus DUAL PORT SCL SDA SCL1 SDA1 SCL2 SDA2 Figure 2 LTC1760 Stretches Host s Communication With Battery 1 While It Completes a Read Of Battery 2...

Page 25: ...60 25 1760fc For more information www linear com LTC1760 OPERATION SMBus DUAL PORT SCL SDA SCL1 SDA1 SCL2 SDA2 Figure 3 LTC1760 Queries Battery 1 Followed By Battery 2 For Requested Current Configurat...

Page 26: ...power on reset event This will reset any wake up charging safety timers and is equivalent to removing and reinserting both batteries The LTC1760 will attempt to reinitiate wake up charging on a batter...

Page 27: ...AC must be present 3 BatterySystemStateCont CHARGING_INHIBIT must be de asserted or low 4 Hardware controlled charging inhibit must be de asserted MODE not low with VDDS high Refer to Section 6 2 5 T...

Page 28: ...to adjust the current so as to match the reported current with the requested current The LTC1760 con tinuously adjusts the charging current by the difference between the actual and requested currents...

Page 29: ...ysignificantfor Lithium Ion batteries Simultaneously charging two bat teries reduces losses in switches and improves efficiency 3 7 Controlled Charging Voltage Programming The LTC1760 monitors the req...

Page 30: ...LTC1760 will select the other battery to power the system 3 A battery issues a TERMINATE_DISCHARGE alarm AC_PRESENTislow andtheotherbatteryisnotpresent or has previously issued an alarm The LTC1760 w...

Page 31: ...The battery being calibrated is removed When the battery being calibrated is removed the LTC1760 will automatically calibrate the other battery if it is request ing calibration BatterySystemStateCont...

Page 32: ...IREV or the beginning of the next cycle The oscillator uses the equation tOFF VDCIN VBAT VDCIN fOSC OPERATION TGATE BGATE ON ON OFF OFF tOFF TRIP POINT SET BY ITH VOLTAGE INDUCTOR CURRENT 1760 F04 Fi...

Page 33: ...ledcharging onlybatterieswith voltages above VCHMIN are allowed to charge When a bat tery is wake up charging this restriction does not apply 8 PowerPath Controller ThePowerPathswitchesareturnedonando...

Page 34: ...R_NOT_GOOD is set Similarly if the voltage at SCN falls below 3V for more than 15ms then all of the PowerPath switches are turned off and POWER_ NOT_GOOD is set high The POWER_NOT_GOOD bit is reset by...

Page 35: ...ator and switch convert the IDAC value to a variable resistance equal to 1 25RSET IDAC VALUE 1023 In regu lation ISET is servo driven to the 0 8V reference voltage VREF and the current from RSET is ma...

Page 36: ...ve for the actual current for each battery IBAT2 ICHRG CBAT2 CBAT1 CBAT2 IBAT1 ICHRG CBAT1 CBAT1 CBAT2 Please note that the actual observed current sharing will vary from manufacturer s claimed capaci...

Page 37: ...to VCC2 APPLICATIONS INFORMATION Warning DONOTCHANGETHEVALUEOFRILIMIT DURINGOPERA TION The value must remain fixed and track the RSENSE value at all times Changing the current setting can result in c...

Page 38: ...that the use of a higher RDS ON device with lower CRSS actually provides higher efficiency The synchronous MOSFET losses are greatest at high input voltage or during a short circuit when the duty cyc...

Page 39: ...HX 400 RVLIMIT RILIMIT 30k VCC2 5 2V and no SMBus Host communication APPLICATIONS INFORMATION IDCIN_CHG ICH1 IVCC2_AC1 ISAFETY1 ISAFETY2 IVLIM IILIM ISMB ISMB_BAT1 ISMB_BAT2 ISMBALERT 1 3mA 700 A 218...

Page 40: ...de a zero in the response to cancel the pole associated with CB2 Acceptable voltage ripple at VSET is about 10mVP P Since the period of the delta sigma switch closure T S is about 11 s and the interna...

Page 41: ...OSFETs are limited to 30V or less SelectioncriteriaforthepowerMOSFETsincludethe ON resistance RDS ON input voltage and maximum output current FortheN channelchargepath themaximumcur rent is the maximu...

Page 42: ...MOSFETs that use more powerful thermal packages will have a high power surge rating Using too small of a pulse rating will allow the MOSFET to blow to the open circuit condition instantly like a fuse...

Page 43: ...desD2 D3 D4 capacitorsC4 COUT and Resistor R11 and RSENSE 4 Reduce CIN capacitor to 0 1 F APPLICATIONS INFORMATION 1760 F10 VBAT L1 VIN HIGH FREQUENCY CIRCULATING PATH BAT SWITCH NODE CIN COUT D1 Figu...

Page 44: ...les 7 Connection of switching ground to system ground or internal ground plane should be single point If the system has an internal system ground plane a good way to do this is to cluster vias into a...

Page 45: ...F Q1 Q2 Q6 Q5 Q7 Q8 Q4 Q3 1760 TA02 LOAD BAT1 BAT2 Q9 Q10 C12 100pF C1 0 1 F C9 0 1 F C6 4 7 F R10 100 CLP DCIN BAT1 BAT2 DCDIV COMP1 GCH2 SCH2 GCH1 SCH1 VSET VCC GND VCC2 SMBALERT SCL SDA VDDS VLIMI...

Page 46: ...45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 47 C 0 10 T C MILLIMETERS INCHES DIMENSIONS DO NOT INCLUDE MOLD FLASH MOLD FLASH SHALL NOT EXCEED 152mm 006 PER SIDE DIMENSIONS DO NOT IN...

Page 47: ...ts use Linear Technology Corporation makes no representa tion that the interconnection of its circuits as described herein will not infringe on existing patent rights REVISION HISTORY REV DATE DESCRIP...

Page 48: ...AC 0 8 Voltage Accuracy 10 Bit IDAC for 5 Current Accuracy LTC4006 Small High Efficiency Fixed Voltage Lithium Ion Battery Charger Constant Current Constant Voltage Switching Regulator with Terminatio...

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