LTC3722-1/LTC3722-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers FEATURES DESCRIPTION n Adaptive or Manual Delay Control for Zero Voltage The LTC 3722-1/LTC3722-2 phase-shift PWM controllers Switching Operation provide all of the control and protection functions neces- n Adjustable Synchronous Rectification T iming for sary to implement a high efficiency, zero voltage switched Highest Efficiency (ZVS), full bridge power converter. Adaptive ZVS circuitry n Adjustable Maximum ZVS Delay delays the turn-on signals for each MOSFET independent n Adjustable System Undervoltage Lockout Hysteresis of internal and external component tolerances. Manual n Programmable Leading Edge Blanking delay set mode enables secondary side control operation n Very Low Start-Up and Quiescent Currents or direct control of switch turn-on delays. n Current Mode (LTC3722-1) or Voltage Mode The LTC3722-1/LTC3722-2 feature adjustable synchron- (LTC3722-2) Operation ous rectiefi r timing for optimal efcfi iency. A UVLO program n Programmable Slope Compensation input provides accurate system turn-on and turn-off n V UVLO and 25mA Shunt Regulator CC voltages. The LTC3722-1 features peak current mode n 50mA Output Drivers control with programmable slope compensation and n Soft-Start, Cycle-by-Cycle Current Limiting and leading edge blanking, while the LTC3722-2 employs Hiccup Mode Short-Circuit Protection voltage mode control. n 5V, 15mA Low Dropout Regulator n The LTC3722-1/LTC3722-2 feature extremely low operating 24-Pin Surface Mount GN Package and start-up currents. Both devices include a full range of protection features and are available in the 24-pin surface APPLICATIONS mount GN package. n Telecommunications, Infrastructure Power Systems All registered trademarks and trademarks are the property of their respective owners. n Distributed Power Architectures n Server Power Supplies TYPICAL APPLICATION V IN 36V TO C IN R1 72V 12V , 240W Converter Efficiency OUT U1 U2 MA MC 95 T1 36V IN L1 LTC3722 V 90 OUT 12V 48V IN L2 72V IN C MB MD OUT 85 RCS 80 ME T2 75 C1 U3 0 2 4 6 8 10 12 14 16 18 20 MF CURRENT (A) 372212 TA01b U1, U2: LTC4440 GATE DRIVER U3: LTC3901 GATE DRIVER 372212 TA01a Rev C 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3722-1/LTC3722-2 ABSOLUTE MAXIMUM RATINGS (Note 1) V to GND (Low Impedance Source) ........ 0.3V to 10V CC V Output Current ................................. Self Regulated REF (Chip Self Regulates at 10.3V) Outputs (A, B, C, D, E, F) Current .......................100mA UVLO to GND ..............................................0.3V to V CC Operating Junction Temperature Range All Other Pins to GND (Note 6) .................................................. 40C to 150C (Low Impedance Source) .......................... 0.3V to 5.5V Storage Temperature Range .................. 65C to 150C V (Current Fed) ...................................................25mA CC Lead Temperature (Soldering, 10 sec) ...................300C PIN CONFIGURATION LTC3722-1 LTC3722-2 TOP VIEW TOP VIEW SYNC 1 24 C SYNC 1 24 C T T DPRG 2 23 GND RAMP 2 23 GND CS 3 22 PGND CS 3 22 PGND COMP 4 21 OUTA COMP 4 21 OUTA RLEB 5 20 OUTB DPRG 5 20 OUTB FB 6 19 OUTC FB 6 19 OUTC SS 7 18 V SS 7 18 V CC CC NC 8 17 OUTD NC 8 17 OUTD PDLY 9 16 OUTE PDLY 9 16 OUTE SBUS 10 15 OUTF SBUS 10 15 OUTF ADLY 11 14 V ADLY 11 14 V REF REF UVLO 12 13 SPRG UVLO 12 13 SPRG GN PACKAGE GN PACKAGE 24-LEAD NARROW PLASTIC SSOP 24-LEAD NARROW PLASTIC SSOP T = 125C, = 100C/W T = 125C, = 100C/W JMAX JA JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3722EGN-1 PBF LTC3722EGN-1 TRPBF LTC3722EGN-1 24-Lead Plastic SSOP 40C to 85C LTC3722EGN-2 PBF LTC3722EGN-2 TRPBF LTC3722EGN-2 24-Lead Plastic SSOP 40C to 85C LTC3722IGN-1 PBF LTC3722IGN-1 TRPBF LTC3722IGN-1 24-Lead Plastic SSOP 40C to 85C LTC3722IGN-2 PBF LTC3722IGN-2 TRPBF LTC3722IGN-2 24-Lead Plastic SSOP 40C to 85C LTC3722HGN-1 PBF LTC3722HGN-1 TRPBF LTC3722HGN-1 24-Lead Plastic SSOP 40C to 150C Consult ADI Marketing for parts specified with wider operating temperature ranges. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev C 2 For more information www.analog.com