LT3748

PRODUCTION

100V Isolated Flyback Controller

Analog Devices LT3748 Product Info

10 February 2026 6

Features

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

Part details & 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.

Applications

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

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