DESCRIPTION
The LT®8301 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.

FEATURES
■ 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
■ VOUT 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
■ AEC-Q100 Qualified for Automotive Applications

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