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LT3757 Datasheet(PDF) 1 Page - Linear Technology |
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LT3757 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 38 page  LTC3784 1 3784fb For more information www.linear.com/LTC3784 n Industrial n Automotive n Medical n Military Typical applicaTion n PolyPhase® Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise n Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation n Wide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-Up n Output Voltage Up to 60V n ±1% 1.200V Reference Voltage n RSENSE or Inductor DCR Current Sensing n 100% Duty Cycle Capability for Synchronous MOSFET n Low Quiescent Current: 28μA n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Power Good Output Voltage Monitor n Low Shutdown Current, IQ < 4µA n Internal LDO Powers Gate Drive from VBIAS or EXTVCC n Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package FeaTures DescripTion 60V PolyPhase Synchronous Boost Controller The LTC®3784 is a high performance PolyPhase® single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification in- creasesefficiency,reducespowerlossesandeasesthermal requirements, simplifying high power boost applications. A 4.5V to 60V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3784 can operate from an input supply as low as 2.3V after start-up. The operating frequency can be set within a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3784 to be configured for 2-, 3-, 4-, 6- and 12-phase operation. The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode® operation, pulse- skipping mode or forced continuous mode at light loads. applicaTions L , LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. 4m 3.3µH 3.3µH 220µF 3784 TA01a TG1 BOOST1 SW1 BG1 FREQ OVMODE SGND SS PGND ITH VBIAS VIN LTC3784 INTVCC PLLIN/MODE TG2 BOOST2 SW2 BG2 SENSE2+ SENSE2– SENSE1+ SENSE1– VFB 15nF 8.66k 0.1µF 100pF 47µF 0.1µF 4.7µF 4.5V TO 60V DOWN TO 2.3V AFTER STARTUP IF VBIAS IS POWERED FROM VOUT 4m 232k 12.1k 0.1µF VOUT 24V AT 10A VOUT FOLLOWS VIN FOR VIN > 24V 240W, 12V to 24V/10A 2-Phase Synchronous Boost Converter OUTPUT CURRENT (A) 40 50 60 70 80 3784 TA01b 30 20 10 0 90 100 10 100 1000 1 0.1 10000 0.01 0.1 1 10 BURST EFFICIENCY BURST LOSS VIN = 12V VOUT = 24V Burst Mode OPERATION FIGURE 10 CIRCUIT 0.0001 0.001 0.00001 Efficiency and Power Loss vs Output Current |
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