FAN53555UC24X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC24X is a synchronous step-down DC-DC converter manufactured by Fairchild Semiconductor, operating within the TinyBuck family. It accepts an input voltage range of 2.5V to 5.5V and delivers a programmable output voltage between 0.6V and 1.23V with a maximum continuous output current of 5A. The device utilizes a fixed switching frequency of 2.4MHz and features digital programming via an I2C interface capable of speeds up to 3.4MHz. Packaged in a compact 20-WLCSP (1.96x1.56mm) format, it supports surface mount installation and operates across a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digital output voltage programming through an I2C-compatible interface for flexible system configuration
• Synchronous rectification architecture designed to maintain high efficiency at low load currents
• Compact WLCSP package topology enabling significant reduction in external passive component size

Voltage Regulators - DC DC Switching Regulators Applications

• Portable computing devices requiring efficient power management
• Smartphones and mobile communication hardware
• Embedded systems utilizing low-voltage digital logic

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix code against official manufacturer documentation to confirm exact factory settings and electrical tolerances. Confirm RoHS compliance status and moisture sensitivity level requirements prior to assembly. Ensure the ordering part number matches the required output voltage range and package variant specified in the design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator when a high-current 5A output is required from a standard single-cell lithium battery or 5V rail. The choice is driven by the need for small footprint solutions using minimal external inductance and capacitance. Verify that the target application can accommodate the 2.4MHz switching frequency noise profile and I2C control bus integration.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the FAN53555 series of digitally programmable buck regulators. It shares the core TinyBuck architecture with other variants in the family but is distinguished by its specific output voltage range and 5A current capability. The UC24X designation identifies the specific pinout and factory-set parameters within the broader product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for direct cross-reference part numbers such as FAN53555UC05X or FAN53555UC01X from onsemi, noting potential differences in output voltage ranges and package dimensions. Verify functional compatibility regarding I2C addressing and thermal performance before substitution.