FAN53555UC09X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC09X is a digitally programmable synchronous buck switching regulator manufactured by Fairchild Semiconductor, now part of onsemi. It operates with an input voltage range of 2.5V to 5.5V and provides a single positive output adjustable from 0.603V to 1.41V. The device supports up to 5A of continuous output current and utilizes a fixed 2.4MHz switching frequency. Packaged in a compact 20-WLCSP (1.96x1.56mm) format, it features synchronous rectification for high efficiency across varying load conditions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digitally programmable output voltage via I2C interface
• Synchronous rectifier architecture for enhanced efficiency
• Compact WLCSP package design minimizing footprint

Voltage Regulators - DC DC Switching Regulators Applications

• Portable computing systems requiring efficient power management
• Smartphones and mobile devices with high-current SoCs
• Digital signal processors and microprocessor core supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer status as Fairchild Semiconductor has been acquired by onsemi; confirm the specific suffix indicates the correct voltage setting. Check datasheet revisions for any pinout or electrical parameter updates. Ensure compatibility with your I2C bus voltage levels and check for RoHS compliance documentation before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-current, digitally adjustable supply is needed in a minimal footprint. The 2.4MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Verify that the required output voltage falls within the 0.603V to 1.41V range and that the PCB layout can accommodate the WLCSP thermal requirements for reliable operation under full load.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the TinyBuck family of regulators designed for space-constrained portable electronics. It replaces older linear regulators to improve battery life and reduce heat dissipation. The UC09X suffix typically denotes a specific factory-set output voltage configuration within the programmable range, distinguishing it from other variants in the series.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other FAN53555 variants with compatible packages and current ratings. Verify that alternative parts support the same 2.4MHz switching frequency and I2C digital control interface to ensure circuit compatibility without redesigning the control logic.