FAN5345S25X

Overview

The FAN5345S25X is a single-channel LED lighting driver IC from the Async Series, manufactured by onsemi (formerly Fairchild Semiconductor). It utilizes a boost topology to drive LEDs with a constant current output of 25 mA. The device operates within an input voltage range of 2.7 V to 5.5 V and features a switching frequency of 1.2 MHz. It supports PWM dimming control and is housed in a compact SSOT-6 surface-mount package. The component functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates a synchronous boost converter for efficient LED driving
• Supports digital interface communication for configuration
• Provides precise constant current regulation for LED segments
• Enables high-frequency PWM dimming for brightness control

Applications

• Mobile phone display backlighting
• MP3 player screen illumination
• PDA device lighting systems

Procurement Notes

Verify the manufacturer designation carefully, as this component was originally produced by Fairchild Semiconductor and is now managed by onsemi following corporate acquisition. Confirm that the specific suffix 'S25' corresponds to the required 25 mA output current rating. Ensure compatibility with the SSOT-6 package footprint during PCB layout review. Check for RoHS compliance status if environmental regulations apply to your assembly process.

Selection Notes

Select this driver when designing portable electronics requiring a single-channel boost solution for segment-based LED displays. It is suitable for applications where space constraints necessitate the small SSOT-6 package. Consider its 1.2 MHz switching frequency for EMI management and inductor size optimization. Verify that the system's input voltage remains within the specified 2.7 V to 5.5 V range for proper operation.

Part Context

This part belongs to the FAN5345 series of LED drivers designed for portable consumer electronics. The series typically includes variants with different output current settings and packaging options. The FAN5345S25X specifically targets the 25 mA requirement for standard LED segments found in older mobile devices and handheld media players, representing a legacy but functional solution for such applications.

Replacement Considerations

The FAN5345S20X is a related variant within the same family, offering similar functionality but potentially differing in output current or specific electrical characteristics. Verify pin-to-pin compatibility and parameter alignment before substitution. Other members of the FAN534x series may serve as alternatives if they match the required boost topology and package type.