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LT3757 Datasheet(PDF) 1 Page - Analog Devices |
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LT3757 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 38 page  LT3757/LT3757A 1 Rev. G For more information www.analog.com n Wide Input Voltage Range: 2.9V to 40V n Positive or Negative Output Voltage Programming with a Single Feedback Pin n Current Mode Control Provides Excellent Transient Response n Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor n Synchronizable to an External Clock n Low Shutdown Current < 1µA n Internal 7.2V Low Dropout Voltage Regulator n Programmable Input Undervoltage Lockout with Hysteresis n Programmable Soft-Start n Small 10-Lead DFN (3mm × 3mm) and Thermally Enhanced 10-Pin MSOP Packages n AEC-Q100 Qualified for Automotive Applications TYPICAL APPLICATION DESCRIPTION Boost, Flyback, SEPIC and Inverting Controller The LT®3757/LT3757A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They can be configured as either a boost, flyback, SEPIC or inverting converter. The LT3757/LT3757A drive a low side external N-channel power MOSFET from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3757/LT3757A can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A low minimum operating supply voltage of 2.9V, and a low shutdown quiescent current of less than 1µA, make the LT3757/LT3757A ideally suited for battery- operated systems. The LT3757/LT3757A feature soft-start and frequency foldback functions to limit inductor current during start- up and output short-circuit. The LT3757A has improved load transient performance compared to the LT3757. High Efficiency Boost Converter FEATURES APPLICATIONS n Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters n Telecom Power Supplies n Portable Electronic Equipment Efficiency SENSE LT3757 VIN VIN 8V TO 16V 10µF 25V X5R VOUT 24V 2A 0.01 41.2k 300kHz GATE FBX GND INTVCC SHDN/UVLO SYNC RT SS VC 200k 43.2k 0.1µF 22k 6.8nF 10µH 3757 TA01a 226k 16.2k 4.7µF 10V X5R 10µF 25V X5R 47µF 35V ×2 + OUTPUT CURRENT (A) 0.001 30 50 40 60 70 80 90 100 0.01 0.1 1 3757 TA01b 10 VIN = 8V VIN = 16V All registered trademarks and trademarks are the property of their respective owners. Document Feedback |
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