LT8303ES5#TRMPBF

The LT8303 is a micropower high voltage 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 450mA, 150V DMOS power switch is integrated along with all high voltage circuitry and control logic into a 5-lead ThinSOT package. The LT8303 operates from an input voltages range of 5.5V to 100V and can deliver up to 5W of isolated output power. The high level of integration and the use of boundary mode and low ripple Burst Mode operations result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.

Applications

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

Key features

• 5.5V to 100V Input Voltage Range
• 450mA, 150V Internal DMOS Power Switch
• Up to 5W of Output Power
• Low Quiescent Current: 70μ in Sleep Mode 280μ 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
• 5-Lead TSOT-23 Package