LT3758 Datasheet | Linear Technology

Features nn Wide Input Voltage Range: 5.5V to 100V nn Positive or Negative Output Voltage Programming with a Single Feedback Pin nn Current Mode Control Provides Excellent Transient Response nn Programmable Operating Frequency (100k Hz to 1MHz) with One External Resistor nn Synchronizable to an External Clock nn Low Shutdown Current < 1µA nn Internal 7.2V Low Dropout Voltage Regulator nn Programmable Input Undervoltage Lockout with Hysteresis nn Programmable Soft-Start nn Small 10-Lead DFN (3mm × 3mm) and MSOPE Packages APPLICATIONS nn Automotive nn Tele nn Industrial All registered trademarks and trademarks are the property of their respective owners. LT3758/LT3758A High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller DESCRIPTION The LT®3758/LT3758A 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 LT3758/LT3758A 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 LT3758/LT3758A can be set with an external resistor over a 100k Hz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 5.5V, and a low shutdown quiescent current of less than 1µA, make the LT3758/LT3758A ideally suited for batterypowered systems. The LT3758/LT3758A feature soft-start and frequency foldback functions to limit inductor current during startup and output short-circuit. The LT3758A has improved load transient performance pared to the LT3758. TYPICAL APPLICATION 12V Output Nonisolated Flyback Power Supply VIN 36V TO 72V CIN 2.2µF 100V X7R 63.4k 200k Hz D1 1M 44.2k 0.47µF VIN SHDN/UVLO 0.022µF 100V 6.2k T1 1,2,3 (SERIES) DSN 4,5,6 (PARALLEL) SYNC...