LTC3677-3

FeaTures Full Featured Li-Ion/Polymer Charger/PowerPath™ Controller with Instant-On Operation n Triple Adjustable High Efficiency Step-Down Switching Regulators (800mA, 500mA, 500mA IOUT) n I2C Adjustable SW Slew Rates for EMI Reduction n High Temperature Battery Voltage Reduction Improves Safety and Reliability n Overvoltage Protection Controller for USB (V BUS)/Wall Inputs Provide Protection to 30V n 1.5A Maximum Charge Current with Thermal Limiting n Battery Float Voltage: 4.2V n Pushbutton ON/OFF Control with System Reset n Dual 150mA Current Limited LDOs n Start-Up Timing Compatible with SiRF Atlas IV Processor n Small 4mm × 7mm 44-Pin QFN Package n LTC3677-3 Highly Integrated Portable Product PMIC DescripTion The LTC®3677-3 is a highly integrated power management IC for single-cell Li-Ion/Polymer battery applications. It includes a PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, input overvoltage protection and numerous other internal protection features. The LTC3677-3 is designed to accurately charge from current limited supplies such as USB by automatically reducing charge current such that the sum of the load current and the charge current does not exceed the programmed input current limit (100mA or 500mA modes). The LTC3677-3 reduces the battery voltage at elevated temperatures to improve safety and reliability. The three step-down switching regulators and two LDOs provide a wide range of available supplies. The LTC3677-3 also includes a pushbutton input to control power sequencing and system reset. The LTC3677-3 has pushbutton timing and sequencing designed to support the SiRF Atlas IV processor. The LTC3677-3 is available in a low profile 4mm × 7mm × 0.75mm 44-pin QFN package. L, LT, LTC, LTM, Linear Technology, PowerPath, Burst Mode and the Linear logo are registered trademarks and Bat-Track and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364, 7511390, 5481178, 6580258. Other patents pending. applicaTions PNDs, DMB/DVB-H, Digital/Satellite Radio, Media Players n Portable Industrial/Medical Products n Other USB-Based Handheld Products n Typical applicaTion 5V ADAPTER USB OVERVOLTAGE PROTECTION CHARGE 2 High Temperature BAT Discharge OPTIONAL 100mA/500mA 1000mA VOUT 0V SINGLE-CELL Li-Ion 0.8V to 3.6V/150mA 0.8V to 3.6V/150mA 0.8V to 3.6V/800mA 0.8V to 3.6V/500mA 0.8V to 3.6V/500mA 36773 TA01a 200 VNTC < VTOO_HOT 180 VBUS = 0V 160 140 IBAT (mA) CC/CV CHARGER LTC3677-3 I2C PORT NTC + 120 100 80 60 40 20 0 3.8 3.9 4.0 VBAT (V) 4.1 4.2 36773 TA01b DUAL LDO REGULATORS TRIPLE HIGH EFFICIENCY STEP-DOWN SWITCHING REGULATORS PB PUSHBUTTON CONTROL 36773f  LTC3677-3 Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Order Information ................................................................................................................. 3 Pin Configuration ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics ......................................................................................... 10 Pin Functions ..................................................................................................................... 15 Block Diagram.................................................................................................................... 18 Operation.......................................................................................................................... 19 PowerPath OPERATION ........................................................................................................................................ 19 Low Dropout Linear Regulator Operation ............................................................................................................. 27 Step-Down Switching Regulator Operation .......................................................................................................... 28 . 2C Operation ........................................................................................................................................................ 32 I Pushbutton Interface Operation ............................................................................................................................ 36 Layout and Thermal Considerations ..................................................................................................................... 40 Typical Application .............................................................................................................. 42 Package Description ............................................................................................................ 43 Typical Application .............................................................................................................. 44 Related Parts ..................................................................................................................... 44 Table oF conTenTs 36773f  LTC3677-3 absoluTe MaxiMuM raTings (Notes 1, 2, 3) pin conFiguraTion TOP VIEW 44 CHRG 43 CLPROG 42 EXTPWR 41 ACPR 40 VBUS 39 VOUT 38 BAT ILIM0 1 ILIM1 2 NC 3 WALL 4 SW3 5 VIN3 6 FB3 7 OVSENS 8 NC 9 DVCC 10 SDA 11 SCL 12 OVGATE 13 PWR_ON 14 ON 15 45 GND 37 IDGATE 36 PROG 35 NTC 34 NTCBIAS 33 SW1 32 VIN12 31 SW2 30 VINLD02 29 LDO2 28 LDO1 27 VINLDO1 26 FB1 25 FB2 24 LDO2_FB 23 LDO1_FB UFF PACKAGE 44-LEAD (7mm 4mm) PLASTIC QFN TJMAX = 110°C, θJA = 45°C/W EXPOSED PAD (PIN 45) IS GND, MUST BE SOLDERED TO PCB PBSTAT 16 EN3 17 NC 18 NC 19 NC 20 PGOOD 21 NC 22 VBUS, VOUT , VIN12, VIN3, VINLDO1, VINLDO2, WALL t < 1ms and Duty Cycle < 1% .................. –0.3V to 7V . Steady State ............................................ –0.3V to 6V CHRG, BAT, PWR_ON, EXTPWR, PBSTAT, PGOOD, FB1, FB2, FB3, LDO1, LDO1_FB, LDO2, LDO2_FB, DVCC, SCL, SDA, EN3 ................. –0.3V to 6V NTC, PROG, CLPROG, ON, ILIM0, ILIM1 (Note 4) .......................................... –0.3V to VCC + 0.3V . IVBUS, IVOUT , IBAT, Continuous (Note 16) .....................2A ISW3, Continuous (Note 16) ................................ 850mA . ISW2, ISW1, Continuous (Note 16) ....................... 600mA . ILDO1, ILDO2, Continuous (Note 16) ..................... 200mA ICHRG , IACPR , IEXTPWR , IPBSTAT, IPGOOD ..................75mA . IOVSENS .................................................................. 10mA ICLPROG, IPROG .........................................................2mA Operating Junction Temperature Range (Note 2) ............................................... –40°C to 85°C Maximum Junction Temperature ...........................110°C Storage Temperature Range .................. –65°C to 125°C orDer inForMaTion LEAD FREE FINISH LTC3677EUFF-3#PBF TAPE AND REEL LTC3677EUFF-3#TRPBF PART MARKING 36773 PACKAGE DESCRIPTION 44-Lead (4mm × 7mm) Plastic QFN TEMPERATURE RANGE –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 36773f  LTC3677-3 elecTrical characTerisTics SYMBOL VBUS IBUS_LIM IBUSQ hCLPROG VCLPROG VUVLO VDUVLO RON_ILIM Battery Charger VFLOAT ICHG IBATQ_OFF IBATQ_ON VPROG,CHG VPROG,TRKL hPROG ITRKL VTRKL ∆VRECHRG tTERM tBADBAT hC/10 RON_CHG TLIM VBAT Regulated Output Voltage LTC3677-3 LTC3677-3, 0 ≤ TJ ≤ 85°C l l l Power Manager. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = 0V, VINLDO2 = VINLOD1 = VIN12 = VIN3 = VOUT, RPROG = 2k, RCLPROG = 2.1k, unless otherwise noted. PARAMETER Input Supply Voltage Total Input Current (Note 5) ILIM0 = 5V, ILIM1 = 5V (1x Mode) ILIM0 = 0V, ILIM1 = 0V (5x Mode) ILIM0 = 0V, ILIM1 = 5V (10x Mode) 1x, 5x, 10x Modes ILIM0 = 5V, ILIM1 = 0V (Suspend Mode) l l l CONDITIONS MIN 4.35 80 450 900 TYP MAX 5.5 UNITS V mA mA mA mA mA mA/mA V V V Input Power Supply 90 475 950 0.42 0.05 1000 1x Mode 5x Mode 10x Mode Rising Threshold Falling Threshold 3.5 0.2 1.0 2.0 3.8 3.7 50 –50 200 3.9 100 100 500 1000 0.1 Input Quiescent Current, POFF State Ratio of Measured VBUS Current to CLPROG Program Current CLPROG Servo Voltage in Current Limit VBUS Undervoltage Lockout V V mV mV mΩ VBUS to VOUT Differential Undervoltage Rising Threshold Lockout Falling Threshold Input Current Limit Power FET On-Resistance (Between VBUS and VOUT) 4.179 4.165 950 465 180 4.200 4.200 1000 500 200 6 55 130 1.000 0.100 1000 4.221 4.235 1050 535 220 27 100 200 V V mA mA mA µA µA µA V V mA/mA Constant-Current Mode Charge Current RPROG = 1k, Input Current Limit = 2A IC Not in Thermal Limit RPROG = 2k, Input Current Limit = 1A RPROG = 5k, Input Current Limit = 0.4A Battery-Drain Current, POFF State, Buck3 Disabled, No Load (Note 14) Battery-Drain Current, PON State, Buck3 Enabled (Notes 10, 14) PROG Pin Servo Voltage PROG Pin Servo Voltage in Trickle Charge Ratio of IBAT to PROG Pin Current Trickle Charge Current Trickle Charge Rising Threshold Trickle Charge Falling Threshold Recharge Battery Threshold Voltage Safety Timer Termination Period Bad Battery Termination Time Battery Charger Power FET On-Resistance (Between VOUT and BAT) Junction Temperature in ConstantTemperature Mode VBAT < VTRKL VBAT Rising VBAT Falling Threshold Voltage Relative to VFLOAT Timer Starts when VBAT = VFLOAT – 50mV VBAT < VTRKL VBAT = 4.3V, Charger Time Out VBUS = 0V VBUS = 0V, IOUT = 0µA, No Load On Supplies, Burst Mode® Operation VBAT > VTRKL VBAT < VTRKL 40 2.5 –75 3.2 0.4 0.085 50 2.9 2.75 –100 4 0.5 0.1 200 110 60 3.0 –125 4.8 0.6 0.11 mA V V mV Hour Hour mA/mA mΩ °C End-of-Charge Indication Current Ratio (Note 6) 36773f  LTC3677-3 elecTrical characTerisTics SYMBOL VCOLD VHOT VTOO_HOT INTC IBAT2HOT VBAT2HOT Ideal Diode VFWD RDROPOUT IMAX VOVCUTOFF VOVGATE IOVSENSQ tRISE VACPR VW ∆VW IQWALL Forward Voltage Detection Diode On-Resistance, Dropout Diode Current Limit Overvoltage Protection Threshold OVGATE Output Voltage OVSENS Quiescent Current OVGATE Time to Reach Regulation ACPR Pin Output High Voltage ACPR Pin Output Low Voltage Absolute Wall Input Threshold Voltage Differential Wall Input Threshold Voltage Wall Operating Quiescent Current IOUT = 10mA IOUT = 200mA (Note 7) Rising Threshold, ROVSENS = 6.2k Input Below VOVCUTOFF Input Above VOVCUTOFF VOVSENS = 5V COVGATE = 1nF IACPR = 0.1mA IACPR = 1mA VWALL Rising VWALL Falling VWALL – VBAT Falling VWALL – VBAT Rising IWALL + IVOUT , IBAT = 0mA, WALL = VOUT = 5V ILIM0, ILIM1 ILIM0, ILIM1 ILIM0, ILIM1; VPIN = 1V ICHRG = 10mA VBAT = 4.5V, VCHRG = 5V 1.2 2 0.15 0 0.4 1 VOUT – 0.3 3.1 0 6.10 5 15 200 3.6 6.35 1.88 • VOVSENS 0 40 2.5 VOUT 0 4.3 3.2 25 75 440 0.3 4.45 100 6.70 12 25 mV mΩ A V V V µA ms V V V V mV mV µA PARAMETER Cold Temperature Fault Threshold Voltage Hot Temperature Fault Threshold Voltage NTC Discharge Threshold Voltage NTC Leakage Current BAT Discharge Current BAT Discharge Threshold NTC, Battery Discharge Protection Rising NTC Voltage Hysteresis Falling NTC Voltage Hysteresis Falling NTC Voltage Hysteresis VNTC = VBUS = 5V VBAT = 4.1V, NTC < VTOO_HOT IBAT < 0.1mA, NTC < VTOO_HOT 75 34 24.5 –50 170 3.9 76 1.3 35 1.3 25.5 50 77 36 26.5 50 %VNTCBIAS %VNTCBIAS %VNTCBIAS %VNTCBIAS %VNTCBIAS mV nA mA V Power Manager. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = 0V, VINLDO2 = VINLOD1 = VIN12 = VIN3 = VOUT, RPROG = 2k, RCLPROG = 2.1k, unless otherwise noted. CONDITIONS MIN TYP MAX UNITS Overvoltage Protection Wall Adapter and High Voltage Buck Output Control Logic (ILIM0, ILIM1 and CHRG) VIL VIH IPD VCHRG ICHRG Input Low Voltage Input High Voltage Static Pull-Down Current CHRG Pin Output Low Voltage CHRG Pin Input Current 0.4 V V µA V µA 36773f  LTC3677-3 elecTrical characTerisTics SYMBOL DVCC IDVCC VDVCC,UVLO VIH VIL IIH IIL VOL fSCL tLOW tHIGH tBUF tHD,STA tSU,STA tSU,STO tHD,DATO tHD,DATI tSU,DAT tSP PARAMETER Input Supply Voltage DVCC Supply Current DVCC UVLO Input High Voltage Input Low Voltage Input High Leakage Current Input Low Leakage Current SDA Output Low Voltage SCL Clock Frequency Low Period of the SCL Clock High Period of the SCL Clock Bus Free Time Between Stop and Start Condition Hold Time After (Repeated) Start Condition Set-Up Time for a Repeated Start Condition Stop Condition Set-Up Time Output Data Hold Time Input Data Hold Time Data Set-Up Time Input Spike Suppression Pulse Width 1.3 0.6 1.3 0.6 0.6 0.6 0 0 100 50 900 SDA = SCL = DVCC = 5.5V SDA = SCL = 0V, DVCC = 5.5V ISDA = 3mA 30 –1 –1 SCL = 400kHz SCL = SDA = 0kHz 1.0 50 50 1 1 0.4 400 70 I2C Interface. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. DVCC = 3.3V, VOUT = 3.8V, unless otherwise noted. CONDITIONS MIN 1.6 TYP MAX 5.5 10 1 UNITS V µA µA V %DVCC %DVCC µA µA V kHz µs µs µs µs µs µs ns ns ns ns Timing Characteristics (Note 8) (All Values Are Referenced to VIH and VIL) 36773f  LTC3677-3 elecTrical characTerisTics SYMBOL VIN12, VIN3 VOUT UVLO fOSC IVIN3Q PARAMETER Input Supply Voltage VOUT Falling VOUT Rising Oscillator Frequency Pulse-Skipping Mode Input Current Burst Mode Operation Input Current Shutdown Input Current ILIM3 VFB3 IFB3 D3 RP3 RN3 RSW3_PD VIL,EN3 VIH,EN3 IVIN12Q Peak P-Channel MOSFET Current Limit Feedback Voltage FB3 Input Current Max Duty Cycle RDS(ON) of P-Channel MOSFET RDS(ON) of N-Channel MOSFET SW3 Pull-Down in Shutdown EN3 Input Low Voltage EN3 Input High Voltage Pulse-Skipping Mode Input Current Burst Mode Operation Input Current Shutdown Input Current ILIM2 VFB2 IFB2 D2 RP2 RN2 RSW2_PD IVIN12Q Peak P-Channel MOSFET Current Limit Feedback Voltage FB2 Input Current Max Duty Cycle RDS(ON) of P-Channel MOSFET RDS(ON) of N-Channel MOSFET SW2 Pull-Down in Shutdown Pulse-Skipping Mode Input Current Burst Mode Operation Input Current Shutdown Input Current ILIM1 VFB1 IFB1 D1 RP1 RN1 RSW1_PD Peak P-Channel MOSFET Current Limit Feedback Voltage FB1 Input Current Max Duty Cycle RDS(ON) of P-Channel MOSFET RDS(ON) of N-Channel MOSFET SW1 Pull-Down in Shutdown (Note 7) Pulse-Skipping Mode Burst Mode Operation (Note 10) FB1 = 0V ISW1 = 100mA ISW1 = –100mA POFF State l l Step-Down Switching Regulators. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VOUT = VIN12 = VIN3 = 3.8V, all regulators enabled unless otherwise noted. CONDITIONS (Note 9) VIN12 and VIN3 Connected to VOUT Through Low Impedance. Switching Regulators Are Disabled Below VOUT UVLO (Note 10) (Note 10) EN3 = 0 (Note 7) Pulse-Skipping Mode Burst Mode Operation (Note 10) FB3 = 0V l l l MIN 2.7 2.5 TYP MAX 5.5 UNITS V V V MHz µA Step-Down Switching Regulators (Buck1, Buck2 and Buck3) 2.7 2.8 2.25 100 20 0.01 1000 0.78 0.78 –0.05 100 0.3 0.4 EN3 = 0 1.2 (Note 10) (Note 10) POFF State (Note 7) Pulse-Skipping Mode Burst Mode Operation (Note 10) FB2 = 0V ISW2 = 100mA ISW2 = –100mA POFF State (Note 10) (Note 10) 650 0.78 0.78 –0.05 100 0.6 0.6 10 l l 2.9 2.59 1.91 800mA Step-Down Switching Regulator 3 (Buck3-Enabled via EN3, Disabled in PDN and POFF States) 35 1 1700 0.82 0.824 0.05 µA µA mA V V µA % Ω Ω kΩ 0.4 V V 100 20 0.01 650 0.78 0.78 –0.05 100 0.6 0.6 10 100 20 0.01 900 0.8 0.8 1 1200 0.82 0.824 0.05 900 0.8 0.8 1 1200 0.82 0.824 0.05 µA µA µA mA V V µA % Ω Ω kΩ µA µA µA mA V V µA % Ω Ω kΩ 36773f 1400 0.8 0.8 10 500mA Step-Down Switching Regulator 2 (Buck2-Pushbutton Enabled, Third in Sequence) 500mA Step-Down Switching Regulator 1 (Buck1-Pushbutton Enabled, Second in Sequence)  LTC3677-3 elecTrical characTerisTics SYMBOL VINLDO1 VOUT_UVLO VLDO1_FB PARAMETER Input Voltage Range VOUT Falling VOUT Rising LDO1_FB Regulated Feedback Voltage LDO1_FB Line Regulation (Note 11) LDO1_FB Load Regulation (Note 11) ILDO1_OC ILDO1_SC VDROP1 RLDO1_PD ILDO_FB1 VINLDO2 VOUT_UVLO VLDO2_FB Available Output Current Short-Circuit Output Current (Note 7) Dropout Voltage (Note 12) ILDO1 = 150mA, VINLDO1 = 3.6V ILDO1 = 150mA, VINLDO1 = 2.5V ILDO1 = 75mA, VINLDO1 = 1.8V LDO1 Disabled –50 VINLDO2 ≤ VOUT + 0.3V LDO2 is Disabled Below VOUT UVLO ILDO2 = 1mA ILDO2 = 1mA, VIN = 1.65V to 5.5V ILDO2 = 1mA to 150mA l l l LDO Regulators. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VINLDO1 = VINLDO2 = VOUT = 3.8V, LDO1 and LDO2 enabled unless otherwise noted. CONDITIONS VINLDO1 ≤ VOUT + 0.3V LDO1 Is Disabled Below VOUT UVLO ILDO1 = 1mA ILDO1 = 1mA, VIN = 1.65V to 5.5V ILDO1 = 1mA to 150mA l l l MIN 1.65 2.5 0.78 TYP MAX 5.5 UNITS V V V V mV/V µV/mA mA mA LDO Regulator 1 (LDO1-Always On) 2.7 2.8 0.8 0.4 5 150 270 160 200 170 10 50 5.5 2.7 2.8 0.8 0.4 5 150 270 ILDO2 = 150mA, VINLDO2 = 3.6V ILDO2 = 150mA, VINLDO2 = 2.5V ILDO1 = 75mA, VINLDO1 = 1.8V LDO2 Disabled –50 160 200 170 14 50 260 320 280 2.9 0.82 260 320 280 2.9 0.82 mV mV mV kΩ nA V V V V mV/V µV/mA mA mA mV mV mV kΩ nA Output Pull-Down Resistance in Shutdown LDO_FB1 Input Current Input Voltage Range VOUT Falling VOUT Rising LDO2_FB Regulated Output Voltage LDO2_FB Line Regulation (Note 11) LDO2_FB Load Regulation (Note 11) LDO Regulator 2 (LDO2-Pushbutton Enabled, First in Sequence) 1.65 2.5 0.78 ILDO2_OC ILDO2_SC VDROP2 RLDO2_PD ILDO_FB2 Available Output Current Short-Circuit Output Current (Note 7) Dropout Voltage (Note 12) Output Pull-Down Resistance in Shutdown LDO_FB2 Input Current 36773f  LTC3677-3 elecTrical characTerisTics SYMBOL VOUT VOUT UVLO VON_TH ION PARAMETER Pushbutton Operating Supply Range VOUT Falling VOUT Rising ON Threshold Rising ON Threshold Falling ON Input Current VON = VOUT VON = 0V Pushbutton Pin (ON) (Note 9) Pushbutton is Disabled Below VOUT UVLO l Pushbutton Controller. The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VOUT = 3.8V, unless otherwise noted. CONDITIONS MIN 2.7 2.5 0.4 –1 –4 0.4 VPWR_ON = 3V VPBSTAT = 3V IPBSTAT = 3mA VEXTPWR = 3V IEXTPWR = 2mA VPGOOD = 3V IPGOOD = 3mA (Note 13) –1 0.1 –8 50 PBSTAT Low > tPBSTAT_PW 40 12 900 50 50 14 1.8 1 1 50 50 PWR_ON Low Recognized from Power-Up PWR_ON High Recognized from Power-Down Buck1, 2 and LDO1 Within PGOOD Threshold Bucks Disabled 12.5 1 1 230 44 14.5 17.5 16.5 –1 –1 0.1 0 0.15 2.7 2.8 0.8 0.7 –9 0.8 0.7 TYP MAX 5.5 2.9 1.2 1 –14 1.2 1 1 0.4 1 0.4 1 0.4 UNITS V V V V V μA μA V V μA μA V μA V μA V % ms μs ms ms Seconds ms Seconds Seconds ms ms Seconds Seconds ms µs ms Power-On Input Pin (PWR_ON) VPWR_ON IPWR_ON IPBSTAT VPBSTAT IEXTPWR VEXTPWR IPGOOD VPGOOD VTHPGOOD tON_PBSTAT1 tON_PBSTAT2 tPBSTAT_PW tON_PUP tON_RST tON_RST_PW tPUP_PDN tPDN_PUP tPWR_ONH tPWR_ONL tPWR_ONBK1 tPWR_ONBK2 tPGOODH tPGOODL tLDO2_BK1 PWR_ON Threshold Rising PWR_ON Threshold Falling PWR_ON Input Current PBSTAT Output High Leakage Current PBSTAT Output Low Voltage EXTPWR Pin Input Current EXTPWR Pin Output Low Voltage PGOOD Output High Leakage Current PGOOD Output Low Voltage PGOOD Threshold Voltage ON Low Time to PBSTAT Low ON High to PBSTAT High PBSTAT Minimum Pulse Width ON Low Time for Power-Up ON Low to PGOOD Reset Low PGOOD Reset Low Pulse Width Minimum Time from Power Up to Down Minimum Time from Power Down to Up PWR_ON High to Power-Up PWR_ON Low to Power-Down PWR_ON Power-Up Blanking PWR_ON Power-Down Blanking From Regulation to PGOOD High Bucks Disabled to PGOOD Low LDO2 Enable to Buck Enable Status Output Pins (PBSTAT, EXTPWR, PGOOD) Pushbutton Timing Parameters Note 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 lifetime. Note 2: The LTC3677-3 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note that the maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 3: This IC includes over temperature protection that is intended to protect the device during momentary overload conditions. Junction temperatures will exceed 110°C when over temperature protection is active. Continuous operation above the specified maximum operating junction temperature may result in device degradation or failure. 36773f  LTC3677-3 elecTrical characTerisTics Note 4: VCC is the greater of VBUS, VOUT or BAT. Note 5: Total input current is the sum of quiescent current, IBUSQ, and measured current given by VCLPROG/RCLPROG • (hCLPROG + 1). Note 6: hC/10 is expressed as a fraction of measured full charge current with indicated PROG resistor. Note 7: The current limit features of this part are intended to protect the IC from short term or intermittent fault conditions. Continuous operation above the maximum specified pin current rating may result in device degradation or failure. Note 8: The serial port is tested at rated operating frequency. Timing parameters are tested and/or guaranteed by design. Note 9: VOUT not in UVLO. Note 10: Buck FB high, not switching. Note 11: Measured with the LDO running unity gain with output tied to feedback pin. Note 12: Dropout voltage is the minimum input to output voltage differential needed for an LDO to maintain regulation at a specified output current. When an LDO is in dropout, its output voltage will be equal to VIN – VDROP . Note 13: PGOOD threshold is expressed as a percentage difference from the Buck1, Buck2 and LDO1 regulation voltages. The threshold is measured from Buck1, Buck2 and LDO1 output rising. Note 14: The IBATQ specifications represent the total battery load assuming VINLDO1, VINLDO2, VIN12 and VIN3 are tied directly to VOUT . Note 15: Long-term current density rating for the part. Typical perForMance characTerisTics TJ = 25°C unless otherwise specified Input Supply Current vs Temperature 0.8 0.7 0.6 IVBUS (mA) IVBUS (mA) 0.5 0.4 0.3 0.2 0.1 0 –50 –25 0 50 75 25 TEMPERATURE (°C) 100 125 36773 G01 Input Supply Current vs Temperature (Suspend Mode) 0.10 VBUS = 5V 450 400 350 300 IBAT (µA) 0.06 250 200 150 0.02 100 50 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 Battery-Drain Current vs Temperature ALL SUPPLIES ENABLED PULSE-SKIPPING MODE NO LOAD ON ALL SUPPLIES VBAT = 3.8V VBUS = 0V ALL SUPPLIES ENABLED Burst Mode OPERATION VBUS = 5V 1x MODE 0.08 0.04 0 –50 ALL SUPPLIES DISABLED EXCEPT LDO1 –25 50 25 0 75 TEMPERATURE (°C) 100 125 36773 G03 36773 G02 36773f 0 LTC3677-3 Typical perForMance characTerisTics TJ = 25°C unless otherwise specified 1200 1100 1000 900 800 IVBUS (mA) 600 500 400 300 200 100 0 –50 –25 1x MODE 50 25 0 75 TEMPERATURE (°C) 100 125 36773 G04 Input Current Limit vs Temperature VBUS = 5V RCLPROG = 2.1k 300 10x MODE 280 260 240 RON (m ) 220 180 160 140 120 100 Input RON vs Temperature IOUT = 400mA 600 500 Charge Current vs Temperature (Thermal Regulation) VBUS = 4.5V IBAT (mA) VBUS = 5V VBUS = 5.5V 400 300 200 100 VBUS = 5V 10x MODE RPROG = 2k 50 25 75 0 TEMPERATURE (°C) 100 125 700 5x MODE 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 36773 G05 0 –50 –25 357734 G06 Battery Current and Voltage vs Time 600 500 400 IBAT (mA) 300 200 CHRG VBAT 4 3 SAFETY TIMER 2 TERMINATION C/10 IBAT 3 4 TIME (HOUR) 5 6 36773 G07 Battery Float Voltage Load Regulation 6 5 VBAT AND VCHRG (V) 4.24 4.22 4.20 VBAT (V) 4.18 4.16 4.14 4.12 4.10 0 200 400 600 800 1000 357734 G08 Battery Regulation (Float) Voltage vs Temperature 4.24 4.22 4.20 4.18 4.16 4.14 4.12 4.10 4.08 4.06 4.04 –50 –25 0 50 75 25 TEMPERATURE (°C) 100 125 36773 G09 VBUS = 5V 10x MODE IBAT = 2mA 1450mAhr CELL 100 VBUS = 5V RPROG = 2k RCLPROG = 2k 0 0 2 1 1 0 VFLOAT (V) IBAT (mA) IBAT vs VBAT 600 500 400 IBAT (mA) 300 200 100 0 0.25 Forward Voltage vs Ideal Diode Current (No External FET) VBUS = 0V TA = 25°C 40 VBAT = 3.2V VBAT = 3.6V VFWD (mV) VBAT = 4.2V 35 30 25 20 15 10 5 0 0.2 0.4 0.6 IBAT (A) 0.8 1.0 1.2 36773 G11 Forward Voltage vs Ideal Diode Current (with Si2333DS External FET) VBAT = 3.8V VBUS = 0V TA = 25°C 0.20 RISING VBAT FALLING VBAT VBUS = 5V 10x MODE RPROG = 2k RCLPROG = 2k 2.0 2.4 2.8 3.2 3.6 VBAT (V) 4.0 4.4 36773 G10 VFWD (V) 0.15 0.10 0.05 0 0 0 0.2 0.4 0.6 IBAT (A) 0.8 1.0 36773 G12 36773f  LTC3677-3 Typical perForMance characTerisTics TJ = 25°C unless otherwise specified Input Connect Waveform VBUS 5V/DIV VOUT 5V/DIV IBUS 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 100mA RCLPROG = 2k RPROG = 2k 1ms/DIV 36773 G13 Input Disconnect Waveform VBUS 5V/DIV VOUT 5V/DIV IBUS 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 100mA RCLPROG = 2k RPROG = 2k 1ms/DIV 36773 G14 Switching from 1x to 5x Mode ILIM0/ILIM1 5V/DIV IBUS 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 50mA RCLPROG = 2k RPROG = 2k 1ms/DIV 36773 G15 Switching from Suspend Mode to 5x Mode ILIM0 5V/DIV VOUT 5V/DIV IBUS 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 100mA RCLPROG = 2k RPROG = 2k ILIM1 = 5V 100µs/DIV 36773 G16 WALL Connect Waveform WALL 5V/DIV VOUT 5V/DIV IWALL 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 100mA RPROG = 2k 1ms/DIV 36773 G17 WALL Disconnect Waveform WALL 5V/DIV VOUT 5V/DIV IWALL 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.75V IOUT = 100mA RPROG = 2k 1ms/DIV 36773 G18 Oscillator Frequency vs Temperature 2.8 2.7 2.6 FREQUENCY (MHz) 2.4 2.3 2.2 2.1 2.0 1.9 1.8 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 36773 G19 100 Step-Down Switching Regulator 1 3.3V Output Efficiency vs IOUT1 Burst Mode 90 OPERATION 80 70 60 50 40 30 VOUT = 5V VOUT = 3.8V EFFICIENCY (%) 2.5 PULSE-SKIPPING 20 10 0 0.01 0.1 1 10 IOUT (mA) VOUT1 = 3.3V VIN12 = 3.8V VIN12 = 5V 100 1000 36773 G20 36773f  LTC3677-3 Typical perForMance characTerisTics TJ = 25°C unless otherwise specified 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0.01 0.1 1 10 IOUT (mA) VOUT2 = 1.8V VIN12 = 3.8V VIN12 = 5V 100 1000 36773 G21 Step-Down Switching Regulator 2 1.8V Output Efficiency vs IOUT2 Burst Mode OPERATION EFFICIENCY (%) PULSE-SKIPPING 100 90 80 70 60 50 40 30 20 10 Step-Down Switching Regulator 3 1.2V Output Efficiency vs IOUT3 Burst Mode OPERATION EFFICIENCY (%) Step-Down Switching Regulator 3 2.5V Output Efficiency 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 IOUT (mA) VOUT3 = 2.5V VIN3 = 3.8V VIN3 = 5V 100 1000 36773 G23 Burst Mode OPERATION PULSE-SKIPPING PULSE-SKIPPING 0 0.01 VOUT3 = 1.2V VIN3 = 3.8V VIN3 = 5V 0.1 1 10 IOUT (mA) 100 1000 36773 G22 Step-Down Switching Regulator Short-Circuit Current vs Temperature 1500 1400 SHORT-CIRCUIT CURRENT (mA) 1300 1200 1100 1000 900 800 700 600 500 –50 –25 0 VINx = 3.8V VINx = 5V 50 75 25 TEMPERATURE (°C) 100 125 36773 G24 Step-Down Switching Regulator Output Transient (Burst Mode Operation) VOUT1 50mV/DIV (AC) VOUT2 50mV/DIV (AC) VOUT3 100mV/DIV (AC) IOUT3 500mA 5mA VOUT1 = 3.3V 50µs/DIV IOUT1 = 10mA VOUT2 = 1.8V IOUT2 = 20mA VOUT3 = 1.2V VOUT = VBAT = 3.8V 36773 G25 Step-Down Switching Regulator Output Transient (Pulse-Skipping) VOUT1 50mV/DIV (AC) VOUT2 50mV/DIV (AC) VOUT3 100mV/DIV (AC) IOUT3 500mA 5mA VOUT1 = 3.3V 50µs/DIV IOUT1 = 30mA VOUT2 = 1.8V IOUT2 = 20mA VOUT3 = 1.2V VOUT = VBAT = 3.8V 36773 G26 800mA BUCK 500mA BUCK Step-Down Switching Regulator Switch Impedance vs Temperature 0.9 0.8 SWITCH IMPEDANCE ( ) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 36773 G27 800mA Step-Down Switching Regulator Feedback Voltage vs Output Current 0.85 0.84 0.85 0.84 0.83 FEEDBACK (V) Burst Mode OPERATION PULSE-SKIPPING 0.82 0.81 0.80 0.79 0.78 0.77 VIN3 = 3.8V VIN3 = 5V 1 10 IOUT (mA) 100 1000 357732 G29 500mA Step-Down Switching Regulator Feedback Voltage vs Output Current VINX = 3.2V 500mA PMOS FEEDBACK (V) 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.1 500mA NMOS Burst Mode OPERATION PULSE-SKIPPING 800mA PMOS 800mA NMOS 0.76 0.75 0.1 1 10 IOUT (mA) VIN12 = 3.8V VIN12 = 5V 100 1000 36773 G29 36773f  LTC3677-3 Typical perForMance characTerisTics TJ = 25°C unless otherwise specified Step-Down Switching Regulator 3 Soft-Start and Shutdown VOUT1 100mV/DIV (AC) 2V VOUT3 1V 0V 400mA IL3 200mA 0mA VOUT1 = 1.8V IOUT1 = 100mA ROUT3 = 3 50µs/DIV 36773 G30 OVP Connection Waveform VBUS 5V/DIV OVGATE 5V/DIV OVP INPUT VOLTAGE 0V TO 5V STEP 5V/DIV 500µs/DIV 36773 G31 OVP Protection Waveform VBUS 5V/DIV OVGATE 5V/DIV OVP INPUT VOLTAGE 5V TO 10V STEP 5V/DIV 500µs/DIV 36773 G32 OVP Reconnection Waveform VBUS 5V/DIV OVGATE 5V/DIV OVP INPUT VOLTAGE 10V TO 5V STEP 5V/DIV 500µs/DIV 36773 G33 OVSENS Quiescent Current vs Temperature 37 VOVSENS = 5V 6.280 Rising Overvoltage Threshold vs Temperature QUIESCENT CURRENT (µA) 35 OPV THRESHOLD (V) –15 35 10 TEMPERATURE (°C) 6.275 33 6.270 31 29 6.265 6.260 27 –40 60 85 36773 G34 6.255 –40 –15 35 10 TEMPERATURE (°C) 60 85 36773 G35 36773f  LTC3677-3 Typical perForMance characTerisTics TJ = 25°C unless otherwise specified OVGATE vs OVSENS 12 OVSENS CONNECTED TO INPUT THROUGH 10 6.2k RESISTOR 8 OVGATE (V) 6 4 IOUT1 2 0 LDO2 20mV/DIV (AC) 100mA 5mA LDO1 = 1.2V 20µs/DIV LDO2 = 2.5V ILDO2 = 40mA VOUT = VBAT = 3.8V 36773 G37 LDO Load Step 200 LDO1 50mV/DIV (AC) IBAT (mA) Too Hot BAT Discharge VNTC < VTOO_HOT 180 VBUS = 0V 160 140 120 100 80 60 40 20 0 3.8 3.9 4.0 VBAT (V) 4.1 4.2 36773 G38 0 2 4 6 INPUT VOLTAGE (V) 8 36773 G36 Battery Discharge vs Temperature 200 BATTERY DISCHARGE CURRENT (mA) 175 150 125 100 75 50 25 0 50 VBAT = 4.1V VNTC < VTOO_HOT 5x MODE IVOUT = 0mA 60 70 90 100 80 TEMPERATURE (°C) 110 120 36773 G39 Input and Battery Current vs Output Current 600 500 400 CURRENT (mA) RPROG = 2k RCLPROG = 2k IIN VBUS = 5V ILOAD VBUS = 0V 300 200 100 0 –100 WALL = 0V 0 100 200 IBAT (DISCHARGING) 400 300 IOUT (mA) 500 600 36773 G40 IBAT (CHARGING) pin FuncTions ILIM0, ILIM1 (Pins 1, 2): Input Current Control Pins. ILIM0 and ILIM1 control the input current limit. See Table 1 in the USB PowerPath Controller section. Both pins are pulled low by a weak current sink. NC (Pins 3, 9, 18, 19, 20, 22): No Connect. This pin has no function and may be floated or connected to ground. WALL (Pin 4): Wall Adapter Present Input. Pulling this pin above 4.3V will disconnect the power path from VBUS to VOUT. The ACPR pin will also be pulled low to indicate that a wall adapter has been detected. SW3 (Pin 5): Power Transmission (Switch) Pin for StepDown Switching Regulator 3 (Buck3). VIN3 (Pin 6): Power Input for Step-Down Switching Regulator 3. This pin should be connected to VOUT. FB3 (Pin 7): Feedback Input for Step-Down Switching Regulator 3 (Buck3). This pin servos to a fixed voltage of 0.8V when the control loop is complete. OVSENSE (Pin 8): Overvoltage Protection Sense Input. OVSENSE should be connected through a 6.2k resistor to the input power connector and the drain of an external 36773f  LTC3677-3 pin FuncTions N-channel MOSFET pass transistor. When the voltage on this pin exceeds a preset level, the OVGATE pin will be pulled to GND to disable the pass transistor and protect downstream circuitry. DVCC (Pin 10): Supply Voltage for I2C Lines. This pin sets the logic reference level of the LTC3677-3. A UVLO circuit on the DVCC pin forces all registers to all 0s whenever DVCC is