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LTC3533 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3533 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC3780 1 3780fe TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Efficiency, Synchronous, 4-Switch Buck-Boost Controller The LTC ®3780 is a high performance buck-boost switch- ing regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase-lock- able frequency of up to 400kHz. With a wide 4V to 30V (36V maximum) input and output range and seamless transfers between operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems. The operating mode of the controller is determined through the FCB pin. For boost operation, the FCB mode pin can select among Burst Mode ® operation, discontinuous mode and forced continuous mode. During buck operation, the FCB mode pin can select among skip-cycle mode, discon- tinuous mode and forced continuous mode. Burst Mode operation and skip-cycle mode provide high efficiency operation at light loads while forced continuous mode and discontinuous mode operate at a constant frequency. Fault protection is provided by an output overvoltage comparator and internal foldback current limiting. A power good output pin indicates when the output is within 7.5% of its designed set point. High Efficiency Buck-Boost Converter n Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT n Wide VIN Range: 4V to 36V Operation n Synchronous Rectification: Up to 98% Efficiency n Current Mode Control n ±1% Output Voltage Accuracy: 0.8V < VOUT < 30V n Phase-Lockable Fixed Frequency: 200kHz to 400kHz n Power Good Output Voltage Monitor n Internal LDO for MOSFET Supply n Quad N-Channel MOSFET Synchronous Drive n VOUT Disconnected from VIN During Shutdown n Adjustable Soft-Start Current Ramping n Foldback Output Current Limiting n Selectable Low Current Modes n Output Overvoltage Protection n Available in 24-Lead SSOP and Exposed Pad (5mm × 5mm) 32-Lead QFN Packages n Automotive Systems n Telecom Systems n DC Power Distribution Systems n High Power Battery-Operated Devices n Industrial Control , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6304066, 5929620, 5408150, 6580258, patent pending on current mode architecture and protection + VIN TG2 0.1μF 0.1μF BOOST2 SW2 BG2 TG1 BOOST1 SW1 BG1 PLLIN RUN VOSENSE ITH SS SGND FCB 0.010Ω 4.7μF A B D C 2200pF 1μF CER 100μF 16V CER 330μF 16V ON/OFF 0.1μF 4.7μH 20k PGOOD LTC3780 INTVCC SENSE+ SENSE– PGND 7.5k 1% 3780 TA01 105k 1% 22μF 50V CER VIN 5V TO 32V VOUT 12V 5A + VIN (V) 0 90 95 100 15 25 3780 TA01b 85 80 510 20 30 35 75 70 8 9 10 7 6 5 4 3 2 1 0 Efficiency and Power Loss VOUT = 12V, ILOAD = 5A |
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