POWER LOSS (W) LTC3779 150V V and V Synchronous IN OUT 4-Switch Buck-Boost Controller FEATURES DESCRIPTION n 4-Switch Current Mode Single Inductor Architecture The LTC 3779 is a high performance buck-boost switching regulator controller that operates from input voltages Allows V Above, Below or Equal to V IN OUT n above, below or equal to the output voltage. The constant Wide V Range: 4.5V to 150V IN n frequency current mode architecture allows a phase- Wide Output Voltage Range: 1.2V V 150V OUT lockable frequency of up to 600kHz, while an input/ n Synchronous Rectification: Up to 99% Efficiency output constant-current loop provides support for battery n 1% 1.2V Voltage Reference charging. n Input or Output Average Current Limit n Onboard LDO or External NMOS LDO for DRV With a wide 4.5V to 150V input and output range and CC n 36V EXTV LDO Powers Drivers seamless transfers between operating regions, the CC n LTC3779 is ideal for automotive, telecom and battery- Programmable 6V to 10V DRV Optimizes Efficiency CC n powered systems. No Top FET Refresh Noise in Boost or Buck Mode n V Disconnected from V During Shutdown OUT IN The LTC3779 features a precision 1.2V reference and n Phase-Lockable Fixed Frequency (50kHz to 600kHz) power good output indicator. The MODE pin can select n No Reverse Current During Start-Up between pulse-skipping mode or forced continuous mode n Power Good Output Voltage Monitor of operation. Pulse-skipping mode offers high efficiency n 150V Rated RUN Pin with Accurate Turn-On Threshold at light load while forced continuous mode operates at n Programmable Input Overvoltage Lockout a constant frequency for noise sensitive applications. n The PLLIN pin allows the IC to be synchronized to an Thermally Enhanced FE38 TSSOP Package Modified external clock. The SS pin ramps the output voltage for High Voltage Operation during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Industrial, Automotive, Medical, Military, Avionics TYPICAL APPLICATION V IN 20V TO 120V 4m V OUT 48V 20F 5F 10A Efficiency and Power Loss 30F 56F 1k vs Input Voltage V BOOST1 INSNS 5 100 30 V 0.22F IN 15H 0.1F SW1 TG1 10k 98 24 BG1 RUN EFFICIENCY 133k V INOV 475k 100 1.21k SENSEP 96 18 220pF 4m NDRV SENSEN 100 DRV CC SGND 94 12 LTC3779 PGND 10F BG2 V5 BOOST2 92 6 2.2F SS 0.22F V = 48V POWER LOSS OUT I = 10A 0.1F FREQ OUT SW2 90 0 56.2k TG2 0 12 24 36 48 60 72 84 96 108 120 100 I AVGSNSP V VOLTAGE (V) IN 4.7F 3779 TA01b 100 I TH I AVGSNSN 1k 10k V OUTSNS 100pF V FB 10nF 3779 TA01a 12.1k Rev A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3779 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage (V ) ....................... 150V to 0.3V IN BG1 1 38 SW1 Topside Driver Voltage VINOV 2 37 TG1 BOOST1, BOOST2 .....................................161V to 0.3V DRVSET 3 36 BOOST1 Switch Voltage SW1, SW2 .......................... 150V to 5V SGND 4 RUN ......................................................... 150V to 0.3V EXTV 5 34 V IN CC I , I ....................................150V to 10V AVGSNSP AVGSNSN NDRV 6 V , V ...................................... 150V to 0.3V INSNS OUTSNS DRV 7 32 V INSNS CC EXTV Voltage ........................................ 36V to 0.3V CC V5 8 NDRV Voltage .................................................... (Note 9) SS 9 30 V OUTSNS 39 DRV Voltage ............................................11V to 0.3V V 10 CC FB PGND BOOST1-SW1, BOOST2-SW2 ......................11V to 0.3V SENSEP 11 28 I AVGSNSN SENSEN 12 TG1-SW1, TG2-SW2, BG1, BG2 .......................... (Note 8) ITH 13 26 I AVGSNSP V5 Voltage.................................................... 6V to 0.3V SGND 14 MODE, PLLIN, SS, PGOOD .......................... V5 to 0.3V MODE 15 24 RUN ITH, FREQ, DRVSET ..................................... V5 to 0.3V PLLIN 16 SENSEP, SENSEN, VINOV ............................ V5 to 0.3V FREQ 17 22 BOOST2 V Voltage ............................................... 2.7V to 0.3V FB PGOOD 18 21 TG2 Operating Junction Temperature BG2 19 20 SW2 Range (Notes 2, 3) ................................. 40C to 150C FE PACKAGE Storage Temperature Range .................. 65C to 150C VARIATION: FE38(31) 38-LEAD PLASTIC TSSOP EXTV /DRV Peak Current ..............................100mA CC CC T = 150C, = 28C/W JMAX JA EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS ORDER INFORMATION