POWER LOSS (W) LTC3769 60V Low I Synchronous Q Boost Controller FEATURES DESCRIPTION n Synchronous Operation for Highest Efficiency and The LTC 3769 is a high performance single output syn- Reduced Heat Dissipation chronous boost converter controller that drives an all n Wide V Range: 4.5V to 60V (65V Abs Max) N-channel power MOSFET stage. Synchronous rectifica- IN Operates Down to 2.3V After Start-Up tion increases efficiency, reduces power losses and eases n Output Voltage Up to 60V thermal requirements, simplifying high power boost ap- n 1% 1.200V Reference Voltage plications. The 28A no-load quiescent current extends n R or Inductor DCR Current Sensing operating run time in battery-powered systems. SENSE n 100% Duty Cycle Capability for Synchronous MOSFET A 4.5V to 60V input supply range encompasses a wide n Low Quiescent Current: 28A range of system architectures and battery chemistries. n Phase-Lockable Frequency (75kHz to 850kHz) When biased from the output of the boost converter or n Programmable Fixed Frequency (50kHz to 900kHz) another auxiliary supply, the LTC3769 can operate from an n Power Good Output Voltage Monitor input supply as low as 2.3V after start-up. The operating n Low Shutdown Current: 4A frequency can be set within a 50kHz to 900kHz range or n Internal LDO Powers Gate Drive from VBIAS or EXTV CC synchronized to an external clock using the internal PLL. n Thermally Enhanced Low Profile 24-Pin 4mm 4mm The SS pin ramps the output voltage during start-up. The QFN Package and 20-Lead TSSOP Package operation, pulse- PLLIN/MODE pin selects Burst Mode skipping mode or forced continuous mode at light loads. APPLICATIONS L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered n Industrial trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U. S. Patents, including 5408150, 5481178, 5705919, n Automotive 5929620, 6177787, 6498466, 6580258, 6611131. n Medical n Military TYPICAL APPLICATION 120W, 12V to 24V/5A Synchronous Boost Converter Efficiency and Power Loss vs Output Current 3.3H 100 10 4m V V IN OUT 4.5V TO 60V 24V/5A 22F 220F 90 DOWN TO 2.3V VBIAS AFTER START-UP IF EFFICIENCY 1 + RUN SENSE VBIAS IS POWERED 10nF 80 V FOLLOWS V FOR V > 24V FROM V OUT IN IN OUT SS SENSE LTC3769 BG 8.66K POWER 15nF 70 0.1 ITH LOSS 100pF TG 60 SW 0.01 PLLIN/MODE 50 0.1F FREQ BOOST 40 0.001 OVMODE 0.0001 0.001 0.01 0.1 1 10 INTV OUTPUT CURRENT (A) CC ILIM 3769 TA01b 4.7F 232k VFB PGOOD EXTV CC 12.1k GND 3769 TA01a 3769fa 1 For more information www.linear.com/LTC3769 EFFICIENCY (%)LTC3769 (Notes 1, 3) ABSOLUTE MAXIMUM RATINGS VBIAS ........................................................ 0.3V to 65V EXTV ...................................................... 0.3V to 14V CC + BOOST ........................................................0.3V to 71V SENSE , SENSE ........................................ 0.3V to 65V + SW ................................................................ 5V to 65V (SENSE - SENSE ) ............................................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 , (BOOST - SW) ..................................0.3V to 6V Lead Temperature (Soldering, 10 sec) SSOP ........300C CC PIN CONFIGURATION TOP VIEW TOP VIEW ILIM 1 20 PGOOD 24 23 22 21 20 19 INTV 2 19 VBIAS CC VBIAS 1 18 SW FREQ 3 18 EXTV CC PGOOD 2 17 OVMODE GND 4 17 INTV CC ILIM 3 16 ITH 25 PLLIN/MODE 5 16 BG 21 GND NC 4 15 VFB GND RUN 6 15 BOOST + INTV 5 14 SENSE CC SS 7 14 TG NC 6 13 SENSE SENSE 8 13 SW 7 8 9 10 11 12 + SENSE 9 12 OVMODE VFB 10 11 ITH FE PACKAGE 20-LEAD PLASTIC TSSOP UF PACKAGE T = 150C, = 38C/W JMAX JA 24-LEAD (4mm 4mm) PLASTIC QFN EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB T = 150C, = 47C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3769EUF PBF LTC3769EUF TRPBF 3769 24-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3769IUF PBF LTC3769IUF TRPBF 3769 24-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3769HUF PBF LTC3769HUF TRPBF 3769 40C to 150C 24-Lead (4mm 4mm) Plastic QFN LTC3769MPUF PBF LTC3769MPUF TRPBF 3769 55C to 150C 24-Lead (4mm 4mm) Plastic QFN LTC3769EFE PBF LTC3769EFE TRPBF LTC3769FE 20-Lead Plastic SSOP 40C to 125C LTC3769IFE PBF LTC3769IFE TRPBF LTC3769FE 20-Lead Plastic SSOP 40C to 125C LTC3769HFE PBF LTC3769HFE TRPBF LTC3769FE 20-Lead Plastic SSOP 40C to 150C LTC3769MPFE PBF LTC3769MPFE TRPBF LTC3769FE 20-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. 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