Linear Technology Isolated Monolithic Flyback Regulator Delivers up to 15W

November 13, 2013  by  


Targeting automotive applications among others, Linear Technology Corporation announced the LT8302, a monolithic flyback regulator that simplifies the design of isolated DC/DC converters.

By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no opto-isolator or third winding for regulation.

The LT8302 operates over a 2.8V to 42V input voltage range, has a 3.6A/65V power switch and delivers up to 15 Watts of output power.

The LT8302 operates in boundary mode, which is a variable frequency current-mode control switching scheme, typically resulting in +/-5% regulation over the full line, load and temperature range. Boundary mode enables 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 can be used for numerous applications. The high level of integration and the use of low ripple Burst Mode® operation result in a simple to use, low component count and high efficiency application solution for isolated power delivery.

Additional features include output short circuit protection, a 380µA no load quiescent current with the output voltage in regulation, internal soft start and compensation, along with output diode temperature compensation.

The LT8302 is available in a small thermally enhanced SO-8 package. Extended and industrial versions operate over a junction temperature range of –40°C to 125°C. A high temperature automotive grade operates from –40°C to 150°C and a military grade operates from –55°C to 150°C. Pricing starts at $3.47 each in 1000-piece quantities. For more information, visit

Summary of Features: LT8302

  • VIN Range from 2.8V to 42V
  • Onboard 3.6A, 65V Integrated Power Switch
  • No Transformer, Third Winding or Opto-Isolator Required for Feedback
  • 380µA Quiescent Current
  • Current-Mode Control
  • Boundary-Mode Operation
  • VOUT Set with Two External Resistors
  • Off-the-Shelf Transformers
  • Output Voltage Temperature Compensation
  • Extended & Industrial Grades: –40°C to 125°C Operating Junction Temp
  • Automotive Temp Grade: –40°C to 150°C Operating Junction Temp
  • Military Temp Grade: –55°C to 150°C Operating Junction Temp


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