150V VIN and VOUT Synchronous 4-Switch Buck-Boost ...

1 LTC3779. 150V VIN and VOUT Synchronous 4-Switch Buck-Boost controller FEATURES DESCRIPTION. nn 4-Switch current Mode Single Inductor Architecture The LTC 3779 is a high performance Buck-Boost switching Allows VIN Above, Below or Equal to VOUT regulator controller that operates from input voltages nn Wide V Range: to 150V. IN above, below or equal to the output voltage. The constant nn Wide Output Voltage Range: V. OUT 150V frequency current mode architecture allows a phase- nn Synchronous Rectification: Up to 99% Efficiency lockable frequency of up to 600kHz, while an input/. nn 1% Voltage Reference output constant- current loop provides support for battery nn Input or Output average current Limit charging. nn Onboard LDO or External NMOS LDO for DRV With a wide to 150V input and output range and CC.

2 Nn 36V EXTV LDO Powers Drivers seamless transfers between operating regions, the CC. nn Programmable 6V to 10V DRV. CC Optimizes Efficiency LTC3779 is ideal for automotive, telecom and battery- nn No Top FET Refresh Noise in Boost or Buck Mode powered systems. nn V. OUT Disconnected from VIN During Shutdown The LTC3779 features a precision reference and nn Phase-Lockable Fixed Frequency (50kHz to 600kHz). power good output indicator. The MODE pin can select nn No Reverse current During Start-Up between pulse-skipping mode or forced continuous mode nn Power Good Output Voltage Monitor of operation. Pulse-skipping mode offers high efficiency nn 150V Rated RUN Pin with Accurate Turn-On Threshold at light load while forced continuous mode operates at nn Programmable Input Overvoltage Lockout a constant frequency for noise sensitive applications.

3 Nn Thermally Enhanced FE38 TSSOP Package Modified The PLLIN pin allows the IC to be synchronized to an for High Voltage Operation external clock. The SS pin ramps the output voltage during start-up. current foldback limits MOSFET heat APPLICATIONS dissipation during short-circuit conditions. nn Industrial, Automotive, Medical, Military, Avionics All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION. VIN. 20V TO 120V. 4m VOUT. 48V. 20 F 5 F. 10A Efficiency and Power Loss 1k VINSNS BOOST1. 30 F 56 F vs Input Voltage 5 . VIN F 100 30. 15 H. F SW1. TG1. 10k BG1 98 24. RUN. 133k EFFICIENCY. VINOV 475k POWER LOSS (W). 100 . EFFICIENCY (%). SENSEP 96 18. 220pF 4m . NDRV. SENSEN. DRVCC SGND 100.

4 LTC3779 94 12. 10 F PGND. BG2. V5 BOOST2 92 6. F SS F VOUT = 48V POWER LOSS. F FREQ SW2. IOUT = 10A. TG2. 90 0. 100 0 12 24 36 48 60 72 84 96 108 120. IAVGSNSP. VIN VOLTAGE (V). F 100 3779 TA01b ITH. IAVGSNSN. 1k 10k VOUTSNS. 100pF. 10nF VFB 3779 TA01a Rev A. Document Feedback For more information 1. LTC3779. ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION. (Note 1). TOP VIEW. Input Supply Voltage (VIN).. 150V to Topside Driver Voltage BG1 1 38 SW1. BOOST1, to VINOV 2 37 TG1. DRVSET 3 36 BOOST1. Switch Voltage SW1, 150V to 5V. SGND 4. 150V to EXTVCC 5 34 VIN. IAVGSNSP , to 10V NDRV 6. VINSNS, 150V to DRVCC 7 32 VINSNS. EXTVCC 36V to V5 8. NDRV (Note 9) SS 9 30 VOUTSNS. DRVCC to VFB 10. 39. PGND. BOOST1-SW1, to SENSEP 11 28 IAVGSNSN.

5 TG1-SW1, TG2-SW2, BG1, (Note 8) SENSEN 12. V5 6V to ITH 13 26 IAVGSNSP. MODE, PLLIN, SS, V5 to SGND 14. ITH, FREQ, V5 to MODE 15 24 RUN. SENSEP, SENSEN, V5 to PLLIN 16. FREQ 17 22 BOOST2. VFB to PGOOD 18 21 TG2. Operating Junction Temperature BG2 19 20 SW2. Range (Notes 2, 3).. 40 C to 150 C. Storage Temperature 65 C to 150 C FE PACKAGE. VARIATION: FE38(31). EXTVCC /DRVCC Peak 38-LEAD PLASTIC TSSOP. TJMAX = 150 C, JA = 28 C/W. EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB. FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS. ORDER INFORMATION #orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE. LTC3779 EFE#PBF LTC3779 EFE#TRPBF LTC3779FE 38-Lead Plastic TSSOP 40 C to 125 C. LTC3779 IFE#PBF LTC3779 IFE#TRPBF LTC3779FE 38-Lead Plastic TSSOP 40 C to 125 C.

6 LTC3779 HFE#PBF LTC3779 HFE#TRPBF LTC3779FE 38-Lead Plastic TSSOP 40 C to 150 C. Consult ADI Marketing for parts specified with wider operating temperature ranges. For 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. Rev A. 2 For more information LTC3779. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2), VIN = 15V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V, VVINOV = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VIN Input Supply Operating Voltage Range (Note 4) 150 V.

7 VOUT Output Supply Operating Voltage Range 150 V. Regulated Feedback Voltage (Note 5); ITH Voltage = l V. Feedback current (Note 5) 15 -50 nA. Reference Voltage Line Regulation (Note 5); VIN = 7V to 100V %. Output Voltage Load Regulation (Note 5); Measured in Servo Loop; ITH l %. Voltage = to 2V. Transconductance Amplifier gm (Note 5); ITH = ; Sink/Source 5 A mmho IQ Input DC Supply current (Note 6) mA. Shutdown RUN = 0V 40 75 A. Undervoltage Lockout V5 Ramping Up V. V5 Ramping Down V. RUN Pin ON Threshold VRUN Rising V. RUN Pin Hysteresis 100 mV. RUN Pin Source current VRUN < A. RUN Pin Hysteresis current VRUN > A. VIN Overvoltage Lockout Threshold VVINOV Rising V. (Rising). VIN Overvoltage Hysteresis 50 mV. SENSE Pins current VSENSEP = VSENSEN = 0 2 A.

8 IAVGSNSP IAVGSNS Pins current VIAVGSNSP = VIAVGSNSN = 10V 15 A. IAVGSNSN. Soft-Start Charge current VSS = 0V 4 5 6 A. VSENSE(MAX) Maximum current Sense Threshold VFB = 1V l 70 90 110 mV. (Buck Region Valley current Mode). Maximum current Sense Threshold VFB = 1V l 120 140 160 mV. (Boost Region Peak current Mode). Maximum Input / Output average VIAVGSNSP = VIAVGSNSN = 10V, VFB = 1V 50 mV. current Sense Threshold DC(MAX, BOOST) Maximum Duty Factor % Switch C On 90 %. DCON(MIN, BOOST) Minimum Duty Factor for Main Switch in % Switch C On 9 %. Boost Operation DCON(MIN, BUCK) Minimum Duty Factor for Main Switch in % Switch B On 9 %. Buck Operation Gate Driver TG Pull-Up On Resistance VDRVCC = 9V . TG Pull-Down On Resistance BG Pull-Up On Resistance VDRVCC = 9V.

9 BG Pull-Down On Resistance 3. TG Transition Time: VDRVCC = 9V (Note 7). Rise Time CLOAD = 3300pF 60 ns Fall Time BG Transition Time: VDRVCC = 9V (Note 7). Rise Time CLOAD = 3300pF 60 ns Fall Time Rev A. For more information 3. LTC3779. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2), VIN = 15V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V, VVINOV = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = V5 60 ns Synchronous Switch-On Delay Time Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = V5 60 ns Top Switch-On Delay Time DRVCC LDO Regulator VDRVCC DRVCC Regulation Voltage from NDRV NDRV Driving External NFET, VEXTVCC = 0V.

10 Regulator 7V < VIN < 150V, VDRVSET = 0V V. 8V < VIN < 150V, VDRVSET = 1/4 VV5 V. 9V < VIN < 150V, VDRVSET = Float V. 10V < VIN < 150V, VDRVSET = 3/4 VV5 V. 11V < VIN < 150V, VDRVSET = VV5 10 V. DRVCC Regulation Voltage from Internal VNDRV = VDRVCC, VEXTVCC = 0V. VIN LDO 7V < VIN < 150V, VDRVSET = 0V V. 8V < VIN < 150V, VDRVSET = 1/4 VV5 V. 9V < VIN < 150V, VDRVSET = Float V. 10V < VIN < 150V, VDRVSET = 3/4 VV5 V. 11V < VIN < 150V, VDRVSET = VV5 V. DRVCC Load Regulation from VIN LDO ICC = 0mA to 50mA, VEXTVCC = 0V 2 %. VEXTVCC DRVCC Regulation Voltage from Internal 7V < VEXTVCC < 30V, VDRVSET = 0V V. EXTVCC LDO 8V < VEXTVCC < 30V, VDRVSET = 1/4 VV5 V. 9V < VEXTVCC < 30V, VDRVSET = Float V. 10V < VEXTVCC < 30V, VDRVSET = 3/4 VV5 V.