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