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100V Flyback Controller Now Offered in Military –55°C to 150°C MP Grade

Mar 18 2015 - MILPITAS, CA
  • Linear Technology Corporation announces a new military MP grade version of the LT3748, a high input voltage isolated flyback DC/DC controller. This device simplifies the design of an isolated DC/DC converter by not requiring an opto-isolator, third winding or signal transformer for feedback since the output voltage is sensed from the primary-side flyback signal. The LT3748 operates over a 5V to 100V input voltage range and drives an external N-channel power MOSFET, making it well suited for a wide variety of automotive, industrial, telecom and datacom applications.

    The LT3748 operates in boundary mode, which is a variable frequency current mode control switching scheme, resulting in ±5% typical regulation over the full line, load and temperature range. Boundary mode also permits the use of a smaller transformer compared to equivalent continuous conduction mode designs. The output voltage is easily set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers are identified in the data sheet that can be used for numerous applications. The high level of integration and the use of boundary mode operation results in a simple, clean application solution to the traditionally tough problem of isolated power delivery.

    Additional features include an on-board low drop regulator for IC power, programmable soft start, undervoltage lockout, adjustable current limit and output voltage temperature compensation.

    The LT3748MP operating junction temperature is from –55°C to 150°C and the device is housed in a MSOP-16 package with 4 pins removed for additional high voltage pin spacing. The 1,000 piece price starts at $9.25 each. For more information, visit

    Summary of Features: LT3748MP

    • –55°C to 150°C Junction Temperature Operation
    • VIN Range from 5V to 100V
    • No Opto-Isolator, Transformer or Third Winding Required for Feedback
    • Drives External N-channel Power MOSFET
    • Current Mode Control
    • Boundary Mode Operation
    • VOUT Set with Two External Resistors
    • Off-the-Shelf Transformers
    • Programmable Soft-Start
    • Programmable Under Voltage Lockout
    • Output Voltage Temperature Compensation

    100V Isolated Flyback Operates Over –55°C to 150°C

    LT3748MP PR Image

    The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

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