LT3790 60V Synchronous 4-Switch Buck-Boost Controller FEATURES DESCRIPTION n 4-Switch Single Inductor Architecture Allows V The LT 3790 is a synchronous 4-switch buck-boost volt- IN Above, Below or Equal to V age/current regulator controller. The LT3790 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 LT3790 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 Easy Parallel Capability to Extend Output Power The LT3790 provides input current monitor, output current n 38-Lead TSSOP with Exposed Pad monitor, and various status flags, such as C/10 charge termination and shorted output flag. APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Automotive, Telecom, Industrial Systems n High Power Battery-Powered System TYPICAL APPLICATION 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 51 + BST2 IVINN 220F 470nF 35V Efficiency vs Load Current IVINP 0.009 V OUT BST1 0.1F 24V 100 4.7F 499k 499k 5A TG1 50V 0.1F 95 EN/UVLO 2 73.2k SWI OVLO 10H 90 BG1 INTV 56.2k 27.4k CC 85 3.83k LT3790 SNSP 100k 200k 80 0.004 SHORT 75 C/10 SNSN CCM PGND 70 IVINMON V = 12V IN BG2 ISMON 65 V = 24V IN CLKOUT SW2 V = 54V IN 60 PWMOUT TG2 0 1 2 3 4 5 V ISP REF LOAD CURRENT (A) 0.1F PWM ISN 3790 TA01b FB CTRL 100k 3790 TA01a SS SYNC V RT SGND C 3.3k 147k 33nF 200kHz 33nF 3790fa 1 For more information www.linear.com/LT3790 EFFICIENCY (%)LT3790 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Supply Voltages CTRL 1 38 OVLO Input Supply (V ) .....................................................60V IN SS 2 37 FB SW1, SW2 ..................................................... 5V 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 LT3790E/LT3790I .............................. 40C to 125C V 12 27 SNSP IN LT3790H ............................................ 40C to 150C INTV 13 26 ISN CC LT3790MP ......................................... 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 = 28C/W JA EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3790EFE PBF LT3790EFE TRPBF LT3790FE 38-Lead Plastic TSSOP 40C to 125C LT3790IFE PBF LT3790IFE TRPBF LT3790FE 38-Lead Plastic TSSOP 40C to 125C LT3790HFE PBF LT3790HFE TRPBF LT3790FE 38-Lead Plastic TSSOP 40C to 150C LT3790MPFE PBF LT3790MPFE TRPBF LT3790FE 38-Lead Plastic TSSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: