Analog Devices LT8301

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.

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.

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

Remarks:Table 1. Predesigned Transformers—TypicalSpecificationsRefer pafe no.12

Typical applications

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

More information

• Datasheet
• IC product information