LT3791-1 60V 4-Switch Synchronous Buck-Boost Controller Fea T Descrip T n 4-Switch Single Inductor Architecture Allows V The LT 3791-1 is a synchronous 4-switch buck-boost volt- IN Above, Below or Equal to V age/current regulator controller. The controller can regulate OUT n Synchronous Switching: Up to 98.5% Efficiency output voltage, output current, or input current with input n Wide V Range: 4.7V to 60V voltages above, below, or equal to the output voltage. The IN n 2% Output Voltage Accuracy: 1.2V V < 60V constant-frequency, current mode architecture allows its OUT n 6% Output Current Accuracy: 0V V < 60V frequency to be adjusted or synchronized from 200kHz OUT n Input and Output Current Regulation with Current to 700kHz. No top FET refresh switching cycle is needed Monitor Outputs in buck or boost operation. With 60V input, 60V output n No Top FET Refresh in Buck or Boost capability and seamless transitions between operating n V Disconnected from V During Shutdown regions, the LT3791-1 is ideal for voltage regulator, bat- OUT IN n C/10 Charge Termination and Output Shorted Flags tery/super-capacitor charger applications in automotive, n Capable of 100W or greater per IC industrial, telecom, and even battery-powered systems. n 38-Lead TSSOP with Exposed Pad For new designs we recommend the LT8390: 60V synchro- nous 4-switch buck-boost controller due to its numerous a T performance improvements over the LT3791-1. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog n Automotive, Telecom, Industrial Systems Devices, Inc. All other trademarks are the property of their respective owners. n High Power Battery-Powered System Typical a T 120W (24V 5A) Buck-Boost Voltage Regulator V 0.003 IN 12V TO + 58V 4.7F 47F V IN INTV 100V CC 80V 1F 4.7F 50 + BST2 IVINN 220F Efficiency vs Load Current 470nF 35V IVINP 0.015 V OUT BST1 0.1F 100 24V TEST1 4.7F 499k 499k 5A TG1 50V 95 0.1F EN/UVLO 2 73.2k SWI 90 OVLO 10H BG1 INTV 56.2k 27.4k CC 85 3.83k LT3791-1 SNSP 80 100k 200k 0.004 SHORT 75 C/10 SNSN CCM 70 PGND IVINMON V = 12V IN BG2 65 V = 24V ISMON IN V = 54V IN CLKOUT SW2 60 PWMOUT TG2 0 1 2 3 4 5 V ISP REF LOAD CURRENT (A) 0.1F 37911 TA01b PWM ISN FB CTRL 100k 37911 TA01a SS SYNC V RT SGND C 5.1k 147k 33nF 200kHz 10nF 37911fb 1 For more information www.linear.com/LT3791-1 EFFICIENCY (%) ion pplica ions pplica ion uresLT3791-1 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW Supply Voltages CTRL 1 38 OVLO Input Supply (V ) .....................................................60V IN SS 2 37 FB SW1, SW2 ......................................................1V to 60V PWM 3 36 V C C/10, SHORT .............................................................15V C/10 4 35 RT EN/UVLO, IVINP, IVINN, ISP, ISN ..............................60V SHORT 5 34 SYNC INTV , (BST1-SW1), (BST2-SW2) .............................6V CC V 6 33 CLKOUT REF CCM, SYNC, RT, CTRL, OVLO, PWM ..........................6V ISMON 7 32 CCM IVINMON, ISMON, FB, SS, VC, V ...........................6V REF IVINMON 8 31 PWMOUT IVINP-IVINN, ISP-ISN, SNSP-SNSN .......................0.5V EN/UVLO 9 30 SGND SNSP, SNSN ...........................................................0.3V 39 IVINP 10 29 TEST1 SGND Operating Junction Temperature (Notes 2, 3) IVINN 11 28 SNSN LT3791E-1/LT3791I-1 ......................... 40C to 125C V 12 27 SNSP IN LT3791H-1 ......................................... 40C to 150C INTV 13 26 ISN CC LT3791MP-1....................................... 55C to 150C TG1 14 25 ISP BST1 15 24 TG2 Storage Temperature Range .................. 65C to 150C SW1 16 23 NC Lead Temperature (Soldering, 10 sec) ...................300C PGND 17 22 BST2 BG1 18 21 SW2 BG2 19 20 PGND FE PACKAGE 38-LEAD PLASTIC TSSOP T = 150C, = 28C/W JMAX JA EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB o r D i n F Ma T