FAN53555UC042X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC042X is a digitally programmable synchronous buck switching regulator manufactured by onsemi, formerly Fairchild Semiconductor. It operates with 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 provides a programmable output voltage range from 603mV to 1.411V. It utilizes a 20-WLCSP package (1.96x1.56mm) for surface mount applications. The component supports operation within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digitally programmable output voltage via I2C-compatible interface
• Synchronous rectification for high efficiency
• Compact WLCSP footprint optimized for space-constrained designs

Voltage Regulators - DC DC Switching Regulators Applications

• Portable computing devices
• Smartphones and mobile phones
• Digital cameras
• Personal digital assistants

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as this component was originally produced by Fairchild Semiconductor and later acquired by onsemi. Confirm the specific suffix 'UC042X' matches the required output voltage range of 603mV to 1.411V. Check current availability status, as some listings indicate end-of-life or discontinuation phases. Ensure compatibility with I2C bus speeds up to 3.4Mbps during integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator when a high-current 5A solution is required in a minimal footprint. The 2.4MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Verify that the target application requires the specific voltage window of 603mV to 1.411V. Consider thermal management requirements given the 5A output capability in a small WLCSP package.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the TinyBuck family of digitally programmable regulators. It shares architectural similarities with other FAN53555 variants but differs in output voltage configuration and package type. The series is designed for low-power portable electronics requiring fast transient response and efficient power conversion.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official distributor databases for cross-reference information.