LT1424IS8-9#PBF

Overview

The LT1424IS8-9#PBF is a monolithic high-power switching regulator designed for isolated flyback topologies. It operates with an input voltage range of 3 V to 20 V and provides a fixed 9 V output at up to 200 mA. The device integrates a high-current switch, oscillator, and control circuitry, eliminating the need for opto-isolators or tertiary windings by sensing output voltage directly from the primary side flyback waveform. It features current-mode control with pulse width modulation, a switching frequency of 285 kHz, and a shutdown function. The component supports operation between -40°C and +125°C.

Feature Summary

• Eliminates the requirement for opto-isolators or tertiary windings through direct primary-side flyback waveform sensing
• Integrates a high-efficiency power switch alongside complete oscillator, control, and protection circuitry on a single die
• Utilizes current-mode control with pulse width modulation for stable regulation in isolated applications

Applications

• Isolated DC-to-DC conversion systems requiring simplified transformer designs
• Power supplies for industrial instrumentation where galvanic isolation is mandatory
• Embedded systems utilizing flyback topology for compact power module implementation

Procurement Notes

Verify that the specific suffix #PBF corresponds to lead-free packaging compliant with RoHS standards before procurement. Confirm the SOIC-8 package dimensions match the target PCB footprint requirements. Ensure the selected variant aligns with the required fixed output voltage specification for the intended application design.

Selection Notes

Select this component when designing isolated flyback converters that require simplified feedback loops without opto-isolators. Consider the 200 mA output current limit and 285 kHz switching frequency for thermal and efficiency planning. Evaluate the wide operating temperature range and shutdown capability against system environmental constraints and power management needs.

Part Context

This part belongs to the LT1424 series of isolated flyback switching regulators manufactured by Analog Devices. The series includes variants with different fixed output voltages, such as the LT1424IS8-5#TR for 5 V outputs. These devices share a common architecture optimized for cost-effective, high-performance isolated power solutions using standard transformer configurations.

Replacement Considerations

LT1424CN8-9