LT8301

RECOMMENDED FOR NEW DESIGNS

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch

Analog Devices LT8301 Product Info

10 February 2026 6

Features

AEC-Q100 Qualified for Automotive Applications
2.7V to 42V Input Voltage Range
1.2A, 65V Internal DMOS Power Switch
Low Quiescent Current:
- 100µA in Sleep Mode
- 350µA in Active Mode
Boundary Mode Operation at Heavy Load
Low-Ripple Burst Mode^® Operation at Light Load

Minimum Load <0.5% (Typ) of Full Output
V_OUT Set with a Single External Resistor
No Transformer Third Winding or Opto-Isolator Required for Regulation
Accurate EN/UVLO Threshold and Hysteresis
Internal Compensation and Soft-Start
Output Short-Circuit Protection
5-Lead TSOT-23 Package

Part details & applications

The LT8301 is a micropower isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor. Internal compensation and soft-start further reduce external component count. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 1.2A, 65V DMOS power switch is integrated along with all high voltage circuitry and control logic into a 5-lead ThinSOT^™ package.

The LT8301 operates from an input voltage range of 2.7V to 42V and can deliver up to 6W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.

Applications

Isolated Telecom, Automotive, Industrial, Medical Power Supplies
Isolated Auxiliary/Housekeeping Power Supplies

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