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LT3782AIUFD Datasheet(PDF) 1 Page - Linear Technology |
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LT3782AIUFD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  LT3782A 1 3782af TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 2-Phase Step-Up DC/DC Controller The LT®3782A is a current mode 2-phase step-up DC/DC converter controller. Its high switching frequency (up to 500kHz) and 2-phase operation reduce system filtering capacitance and inductance requirements. With 10V gate drive (VCC ≥13V) and 4A peak drive current, the LT3782A can drive most industrial grade high power MOSFETs with high efficiency. For synchronous applica- tions, the LT3782A provides synchronous gate signals with programmable falling edge delay to avoid cross conduction when using external MOSFET drivers. Other features include programmable undervoltage lockout, soft-start, current limit, duty cycle clamp (50% or higher) and slope compensation. The LT3782A is identical to the LT3782 except that the LT3782A has a tighter current sense mismatch tolerance. The LT3782A is available in thermally enhanced 28-lead TSSOP and 4mm × 5mm QFN packages. n Industrial Equipment n Telecom Infrastructure n Interleaved Isolated Power Supply n 2-Phase Operation Reduces Required Input and Output Capacitance n Programmable Switching Frequency: 150kHz to 500kHz n 6V to 40V Input Range n 10V Gate Drive with VCC ≥13V n High Current Gate Drive (4A) n Programmable Soft-Start and Current Limit n Programmable Slope Compensation for High Noise Immunity n MOSFET Gate Signals with Programmable Falling Edge Delay for External Synchronous Drivers n Programmable Undervoltage Lockout n Programmable Duty Cycle Clamp (50% or Higher) n Thermally Enhanced 28-Lead TSSOP and 4mm × 5mm QFN Packages 50V 4A Boost Converter 3782A TA01 6.8nF 13k 0.1μF 10nF 10μF ×2 80k 59k 0.004Ω 1μF 274k 825k 220μF VOUT 50V, 4A VIN 10V TO 36V + 2μF 20μH 20μH 0.004Ω LT3782A VCC RUN SLOPE DELAY DCL RSET SS VC GBIAS2 GBIAS BGATE1 VEE1 BGATE2 VEE2 SENSE1+ SENSE1– SENSE2+ SENSE2– FB GND GBIAS1 10Ω 10nF 10Ω 475k D1 D2 100pF 24.9k 10μF ×2 Efficiency and Power Loss vs Load Current IOUT (A) 0 4 3782A TA01b 18 15 12 9 6 3 0 1 2 3 5 VIN = 12V VIN = 12V VIN = 24V VIN = 24V EFFICIENCY POWER LOSS 97 93 95 91 89 87 85 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194. |
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