POWER LOSS (mW) LTC3784 60V PolyPhase Synchronous Boost Controller Fea T Descrip T n PolyPhase Operation Reduces Required Input and The LTC 3784 is a high performance PolyPhase single Output Capacitance and Power Supply Induced Noise output synchronous boost converter controller that drives n Synchronous Operation for Highest Efficiency and two N-channel power MOSFET stages out-of-phase. Reduced Heat Dissipation Multiphase operation reduces input and output capacitor n Wide V Range: 4.5V to 60V (65V Abs Max) requirements and allows the use of smaller inductors than IN Operates Down to 2.3V After Start-Up the single-phase equivalent. Synchronous rectification in- n Output Voltage Up to 60V creases efficiency, reduces power losses and eases thermal n 1% 1.200V Reference Voltage requirements, simplifying high power boost applications. n R or Inductor DCR Current Sensing SENSE A 4.5V to 60V input supply range encompasses a wide n 100% Duty Cycle Capability for Synchronous MOSFET range of system architectures and battery chemistries. n Low Quiescent Current: 28A When biased from the output of the boost converter or n Phase-Lockable Frequency (75kHz to 850kHz) another auxiliary supply, the LTC3784 can operate from an n Programmable Fixed Frequency (50kHz to 900kHz) input supply as low as 2.3V after start-up. The operating n Power Good Output Voltage Monitor frequency can be set within a 50kHz to 900kHz range or n Low Shutdown Current, I < 4A Q synchronized to an external clock using the internal PLL. n Internal LDO Powers Gate Drive from VBIAS or EXTV CC PolyPhase operation allows the LTC3784 to be configured n Thermally Enhanced Low Profile 28-Pin 4mm 5mm for 2-, 3-, 4-, 6- and 12-phase operation. QFN Package and Narrow SSOP Package The SS pin ramps the output voltage during start-up. The a T operation, pulse- PLLIN/MODE pin selects Burst Mode skipping mode or forced continuous mode at light loads. n Industrial L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase n Automotive are registered trademarks and No R and ThinSOT are trademarks of Linear Technology SENSE Corporation. All other trademarks are the property of their respective owners. Protected by n Medical U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. n Military Typical a T 240W, 12V to 24V/10A 2-Phase Synchronous Boost Converter 3.3H 4m + SENSE1 47F Efficiency and Power Loss SENSE1 vs Output Current BG1 BOOST1 100 10000 0.1F V V IN VBIAS OUT 24V AT 10A 90 4.5V TO 60V SW1 DOWN TO 2.3V AFTER 220F 80 1000 TG1 STARTUP IF VBIAS IS LTC3784 POWERED FROM V OUT 70 INTV CC V 60 100 OUT 4.7F 3.3H 4m FOLLOWS V IN 50 FOR V > 24V IN + SENSE2 40 10 BURST EFFICIENCY SENSE2 30 BURST LOSS BG2 V = 12V IN 20 1 V = 24V OUT BOOST2 Burst Mode OPERATION 10 FREQ 0.1F FIGURE 10 CIRCUIT 0 0.1 OVMODE SW2 0.00001 0.0001 0.001 0.01 0.1 1 10 TG2 PLLIN/MODE ITH VFB OUTPUT CURRENT (A) 3784 TA01b 3784 TA01a SS SGND PGND 15nF 232k 12.1k 8.66k 100pF 0.1F 3784fb 1 For more information www.linear.com/LTC3784 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3784 (Notes 1, 3) a Te Maxi Mu M r a T VBIAS ........................................................ 0.3V to 65V EXTV ...................................................... 0.3V to 14V CC + + BOOST1 and BOOST2 .................................0.3V to 71V SENSE1 , SENSE1 , SENSE2 , SENSE2 ... 0.3V to 65V + + SW1 and SW2 ............................................... 5V to 65V (SENSE1 - SENSE1 ), (SENSE2 - SENSE2 ) ...0.3V to 0.3V RUN ............................................................. 0.3V to 8V ILIM, SS, ITH, FREQ, PHASMD, VFB .....0.3V to INTV CC Maximum Current Sourced into Pin Operating Junction Temperature From Source >8V ..............................................100A Range (Note 2) ........................................55C to 150C PGOOD, PLLIN/MODE ................................. 0.3V to 6V Storage Temperature Range .................. 65C to 150C INTV , (BOOST1 - SW1), (BOOST2 - SW2) ...0.3V to 6V Lead Temperature (Soldering, 10 sec) SSOP ........300C CC p in c F T TOP VIEW TOP VIEW 1 28 PGOOD ILIM + 2 27 SW1 SENSE1 28 27 26 25 24 23 3 26 TG1 SENSE1 FREQ 1 22 BOOST1 4 25 BOOST1 FREQ 2 21 BG1 PHASMD 5 24 BG1 PHASMD 3 20 VBIAS CLKOUT 6 23 VBIAS CLKOUT 4 19 PGND PLLIN/MODE 29 7 22 PGND PLLIN/MODE GND 5 18 EXTV SGND CC 8 21 EXTV SGND CC 6 17 INTV RUN CC 9 20 INTV RUN CC 7 16 BG2 SS 10 19 BG2 SS 8 15 BOOST2 SENSE2 11 18 BOOST2 SENSE2 9 10 11 12 13 14 + 12 17 TG2 SENSE2 13 16 SW2 VFB 14 15 OVMODE ITH UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN GN PACKAGE 28-LEAD PLASTIC SSOP T = 150C, = 43C/W JMAX JA EXPOSED PAD (PIN 29) IS GND, MUST BE CONNECTED TO GND T = 150C, = 80C/W JMAX JA o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3784EUFD PBF LTC3784EUFD TRPBF 3784 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3784IUFD PBF LTC3784IUFD TRPBF 3784 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3784HUFD PBF LTC3784HUFD TRPBF 3784 28-Lead (4mm 5mm) Plastic QFN 40C to 150C LTC3784MPUFD PBF LTC3784MPUFD TRPBF 3784 55C to 150C 28-Lead (4mm 5mm) Plastic QFN LTC3784EGN PBF LTC3784EGN TRPBF LTC3784GN 28-Lead Plastic SSOP 40C to 125C LTC3784IGN PBF LTC3784IGN TRPBF LTC3784GN 28-Lead Plastic SSOP 40C to 125C LTC3784HGN PBF LTC3784HGN TRPBF LTC3784GN 28-Lead Plastic SSOP 40C to 150C LTC3784MPGN PBF LTC3784MPGN TRPBF LTC3784GN 28-Lead Plastic SSOP 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: