FAN53555UC18X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC18X is a synchronous step-down DC-DC converter manufactured by Fairchild Semiconductor, now part of onsemi. It operates within an input voltage range of 2.5V to 5.5V and delivers a maximum output current of 5A. The device features a fixed switching frequency of 2.4MHz and utilizes a digitally programmable interface for output voltage adjustment between 0.6V and 1.23V. Packaged in a compact 20-WLCSP (1.96x1.56mm) format, it supports surface mount installation and functions across an operating temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous rectification architecture ensures high efficiency at light loads
• Digitally programmable output voltage via I2C-compatible interface
• Fixed 2.4MHz switching frequency enables use of small external components
• Integrated protection against over-current and thermal overload

Voltage Regulators - DC DC Switching Regulators Applications

• Portable media players and smartphones
• Digital signal processors (DSPs) and microprocessors
• Smartphones and PDAs
• Camera modules and portable electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or onsemi, noting that onsemi acquired Fairchild's semiconductor business. Confirm the specific suffix 'UC18X' matches the required output voltage setting and package type. Check RoHS compliance status and ensure the component is not obsolete, as many variants have reached end-of-life status.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5A output capability is required in a minimal footprint. The 2.4MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Ensure the application requires digital voltage programming rather than fixed resistor settings. Verify that the 2.5V minimum input voltage aligns with the system power rail.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the TinyBuck family of regulators designed for space-constrained mobile applications. It replaces older linear regulators and lower-performance switching converters. The series offers a balance of high current density and digital control flexibility for modern portable devices.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitutes include FAN53555UC01X and FAN53555BUC79X. Verify pin compatibility and output voltage settings before substitution.