LT3748 Datasheet

• 5V to 100V Input Voltage Range
• 1.9A Average Gate Drive Source and Sink Current
• Boundary Mode Operation
• No Transformer Third Winding or Opto-Isolator Required for Regulation
• Primary-Side Winding Feedback Load Regulation
• V_OUT Set with Two External Resistors
• INTV_CC Pin for Control of Gate Driver Voltage
• Programmable Soft Start
• Programmable Undervoltage Lockout
• Available in MSOP Package
• AEC-Q100 Qualified for Automotive Applications

• Isolated Telecom Converters
• High Power Automotive Supplies
• Isolated Industrial Power Supplies
• Military and High Temperature Applications

The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform.

The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V.

The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed.