FAN5346S20X

Overview

The FAN5346S20X is an asynchronous constant-current LED driver from onsemi, designed for series-connected LED configurations. It features a fixed switching frequency of 1.2 MHz and supports an input voltage range of 2.5 V to 5.5 V. The device provides a regulated output voltage of 20 V, enabling the drive of up to five LEDs in series. Key electrical parameters include a maximum output current of 25 mA and a maximum supply current of 300 µA. It operates within a temperature range of -40 °C to +85 °C and is housed in a compact SSOT-6 package.

Feature Summary

• Asynchronous boost converter topology optimized for small form-factor applications
• Integrated PWM dimming interface for brightness control with frequencies from 5 kHz to 100 kHz
• Comprehensive protection mechanisms including thermal shutdown, output over-voltage protection, and short-circuit detection

Applications

• Cellular mobile handsets
• Mobile internet devices
• Portable media players
• PDAs, digital still cameras, and MP3 players

Procurement Notes

Verify component authenticity through authorized onsemi distributors or certified partners. Confirm RoHS compliance status via official documentation. Check for obsolescence notices as availability may be limited. Ensure proper handling procedures are followed during storage and assembly to maintain device integrity.

Selection Notes

Select this driver for portable electronics requiring high-efficiency series LED driving in minimal space. The 1.2 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Ensure the application requires a 20 V output capability and fits within the specified input voltage window. Consider the SSOT-6 package constraints for PCB layout.

Part Context

This component belongs to the FAN5346 series of LED drivers developed by onsemi (formerly Fairchild Semiconductor). The series includes variants such as the FAN5346S30X, which offers a higher 30 V output for driving more LEDs in series. These devices are engineered specifically for battery-powered consumer electronics where power efficiency and physical size are critical design factors.

Replacement Considerations

The FAN5346S30X serves as a functional substitute if the application requires a higher output voltage of 30 V instead of 20 V. Both parts share identical pinouts, control interfaces, and protection features. Verify that the increased output voltage does not exceed the forward voltage requirements of the target LED string.