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LTC1871 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1871 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3787 1 3787fc n Industrial n Automotive n Medical n Military TYPICAL APPLICATION n 2-Phase 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 38V (40V Abs Max) and Operates Down to 2.5V 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: 135μA 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 < 8μA 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 PolyPhase Synchronous Boost Controller The LTC®3787 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- creases efficiency, reduces power losses and eases thermal requirements, enabling high power boost applications. A 4.5V to 38V 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 LTC3787 can operate from an input supply as low as 2.5V after start-up. The operat- ing frequency can be set for a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3787 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. 15nF 4.7μF 8.66k 12.1k VOUT 24V AT 10A VIN VIN 4.5V TO 24V START-UP VOLTAGE OPERATES THROUGH TRANSIENTS DOWN TO 2.5V 0.1μF 100pF 220μF TG1 BOOST1 SW1 BG1 FREQ SS SGND SENSE1+ SENSE1– VFB ITH VBIAS LTC3787 INTVCC PLLIN/MODE TG2 BOOST2 SW2 BG2 SENSE2+ SENSE2– PGND 0.1μF 0.1μF 4.7μF 232k 3787 TA01a 47μF 3.3μH 3.3μH 4mΩ 4mΩ 12V to 24V/10A 2-Phase Synchronous Boost Converter OUTPUT CURRENT (A) 40 50 60 70 80 3787 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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