POWER LOSS (W) LTC3777 150V V and V Synchronous IN OUT 4-Switch Buck-Boost Controller + Switching Bias Supply FEATURES DESCRIPTION n 4-Switch Current Mode Single Inductor Architecture The LTC 3777 is a high performance buck-boost switching Allows V Above, Below or Equal to V regulator controller that operates from input voltages IN OUT n Wide V Range: 4.5V to 150V above, below or equal to the output voltage. The constant IN n Wide Output Voltage Range: 1.2V V 150V frequency current mode architecture allows a phase-lockable OUT n Synchronous Rectification: Up to 99% Efficiency frequency of up to 600kHz, while an input/output constant n 1% 1.2V Voltage Reference current loop provides support for battery charging. The n Input or Output Average Current Limit 150V integrated switching bias supply is a high efficiency n Integrated 12A I , 150V, 85mA, Switching Bias step-down regulator that draws only 12A typical DC supply Q for Optimal Thermal Performance current with a regulated output voltage at no load. n Programmable 6V to 10V DRV Optimizes Efficiency CC With a wide 4.5V to 150V input and output range and n No Top FET Refresh Noise in Boost or Buck Mode seamless transfers between operating regions, the n V Disconnected from V During Shutdown OUT IN LTC3777 is ideal for industrial, telecom and battery- n Phase-Lockable Fixed Frequency (50kHz to 600kHz) powered systems. n No Reverse Current During Start-Up n The LTC3777 features a power good output indicator 150V Rated RUN Pin with Accurate Turn-On Threshold n and a MODE pin to select between pulse-skipping mode Thermally Enhanced 48-Lead e-LQFP Package or forced continuous mode of operation. The PLLIN pin allows the IC to be synchronized to an external clock. The APPLICATIONS SS pin ramps the output voltage during start-up. Current n Industrial, Transportation, Medical, Military, Avionics foldback limits MOSFET heat dissipation during short- All registered trademarks and trademarks are the property of their respective owners. circuit conditions. TYPICAL APPLICATION 4m V V IN OUT 48V, 10A 16V TO 120V 30F 20F 56F 1k V BOOST1 15H INSNS 5 5F 0.22F V IN Efficiency and Power Loss SW1 0.1F DRV CC vs Input Voltage TG1 LTC3777 BG1 10F 100 30 133k V INOV 100 1.21k SENSEP 98 24 SENSEN EFFICIENCY 4m BV 220pF IN 475k 100 1F SGND BOV 96 18 PGND BRUN BV OUT 220H BG2 94 12 12V BSW BOOST2 85mA BV FB 0.22F 715k BGND 51.1k SW2 92 6 44F TG2 V = 48V POWER LOSS OUT I I = 10A EXTV AVGSNSP OUT CC 100 4.7F 90 0 1F 0 12 24 36 48 60 72 84 96 108 120 10k I AVGSNSN 1k V VOLTAGE (V) RUN 100 IN V 3777 TA01b OUTSNS PGOOD 2.2F V 100k FB V5 100pF ITH 0.1F 12.1k SS MODE FREQ PLLIN 10k 56.2k 10nF 3777 TA01a Rev A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3777 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage (V ), BV .............. 150V to 0.3V IN IN Topside Driver Voltage BOOST1, BOOST2 .....................................161V to 0.3V Switch Voltage SW1, SW2 .......................... 150V to 5V RUN, BRUN .............................................. 150V to 0.3V BRUN 1 36 V IN I , I ....................................150V to 10V AVGSNSP AVGSNSN NC 2 35 NC BSW 3 34 V INSNS V , V ...................................... 150V to 0.3V INSNS OUTSNS NC 4 33 NC EXTV Voltage ........................................ 36V to 0.3V BV 5 32 V IN OUTSNS CC NC 6 49 31 NC DRV Voltage ............................................11V to 0.3V CC BOV 7 PGND 30 I AVGSNSN BFBO 8 29 I AVGSNSP BOOST1-SW1, BOOST2-SW2 ......................11V to 0.3V NC 9 28 NC BGND 10 27 RUN TG1-SW1, TG2-SW2, BG1, BG2 .......................... (Note 8) BI 11 26 NC SET V5, BOV, BFBO, BV , BI Voltage ............ 6V to 0.3V BV 12 25 BOOST2 FB FB SET MODE, PLLIN, SS, PGOOD .......................... V5 to 0.3V ITH, FREQ, DRVSET ..................................... V5 to 0.3V SENSEP, SENSEN, VINOV ............................ V5 to 0.3V V Voltage ............................................... 2.7V to 0.3V FB Operating Junction Temperature LXE PACKAGE 48-LEAD (7mm 7mm) PLASTIC e-LQFP Range (Notes 2, 3) ................................. 40C to 150C T = 150C, = 36C/W JMAX JA Storage Temperature Range .................. 65C to 150C EXPOSED PAD (PIN 49) IS PGND, MUST BE SOLDERED TO PCB FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS EXTV /DRV Peak Current ..............................100mA CC CC ORDER INFORMATION LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3777ELXE PBF LTC3777 LXE 48-Lead (7mm 7mm) Plastic e-LQFP 40C to 125C LTC3777ILXE PBF LTC3777 LXE 48-Lead (7mm 7mm) Plastic e-LQFP 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev A 2 For more information www.analog.com 48 V SENSEP 13 FB 47 SS SENSEN 14 46 V5 ITH 15 45 DRV SGND 16 CC 44 EXTV MODE 17 CC 43 DRVSET PLLIN 18 42 VINOV FREQ 19 41 BG1 PGOOD 20 40 NC BG2 21 39 SW1 NC 22 38 TG1 SW2 23 37 BOOST1 TG2 24