FAN4855MTC

Overview

The FAN4855MTC is a synchronous step-up DC-DC converter manufactured by Fairchild Semiconductor. It operates with an input voltage range of 1.6V to 4.5V and provides a single adjustable output between 3V and 5V. The device supports a maximum output current of 0.5A and functions at a switching frequency of up to 430kHz. It is housed in an 8-pin TSSOP package.

Feature Summary

• Synchronous rectification for high efficiency
• Adjustable output voltage configuration
• Positive output boost topology

Applications

• Portable battery-powered devices
• Low voltage power supply systems
• General purpose step-up conversion

Procurement Notes

Verify the manufacturer origin, as Fairchild Semiconductor assets were acquired by ON Semiconductor. Confirm the specific datasheet version matches the required electrical characteristics. Ensure the 8-pin TSSOP package dimensions align with the PCB footprint design. Check for RoHS compliance status if required by the end product specifications.

Selection Notes

Select this component when a compact solution is needed for boosting low input voltages (down to 1.6V) to stable 3V or 5V levels. The synchronous design offers better efficiency compared to non-synchronous alternatives. Consider the 430kHz switching frequency for balancing component size and noise. Ensure the load current does not exceed the 0.5A limit.

Part Context

This part belongs to the family of DC-DC converters designed for portable electronics. It serves as a power management integrated circuit (PMIC) for applications requiring efficient voltage elevation from single-cell lithium batteries or similar low-voltage sources.

Replacement Considerations

Check for equivalents from ON Semiconductor, which acquired Fairchild's logic and PMIC lines. Verify pin compatibility and thermal performance before substitution.