FAN53555UC042X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC042X is a synchronous buck switching voltage regulator from onsemi's TinyBuck series. It operates with an input voltage range of 2.5 V to 5.5 V and delivers a maximum output current of 5 A. The device provides a fixed output voltage of 1.2 V. It features a digital interface for programmability within the broader family, though this specific suffix denotes a fixed configuration. The switch frequency is 2.4 MHz. It is housed in a 20-WLCSP package measuring 1.96 mm by 1.56 mm. The component supports operation temperatures from -40 °C to +85 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology with integrated power switches
• Digital programmable control interface architecture
• Compact wafer-level chip scale packaging

Voltage Regulators - DC DC Switching Regulators Applications

• Cloud systems computing power distribution
• Server motherboard core voltage regulation
• Portable electronic device power management

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized onsemi distributors or certified partners. Confirm that the specific UC042X suffix corresponds to the required fixed 1.2 V output specification rather than a generic programmable variant. Check for End-of-Life status indicators as manufacturing transitions may affect long-term supply availability. Ensure handling procedures comply with moisture sensitivity level requirements for WLCSP packages during assembly.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a stable 1.2 V rail is required at up to 5 A from a 2.5 V to 5.5 V source. The 2.4 MHz switching frequency allows for smaller external passive components compared to lower-frequency alternatives. The WLCSP-20 footprint is suitable for high-density PCB layouts where space is constrained. Consider thermal dissipation capabilities of the small package if operating near maximum current limits continuously.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the FAN53555 TinyBuck family, designed for high-efficiency DC-DC conversion in portable and computing applications. The family shares common control logic and digital interface protocols, differentiated primarily by output voltage configurations and current ratings. The UC042X variant specifically targets applications requiring a fixed 1.2 V output, simplifying design implementation while maintaining the series' compact form factor and performance characteristics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

FAN53555UC01X

Voltage Regulators - DC DC Switching Regulators FAQ

Is the FAN53555UC042X digitally programmable?

While the FAN53555 family features a digital interface, the UC042X suffix indicates a fixed 1.2 V output configuration. It does not support dynamic voltage adjustment like other variants in the series.

What is the maximum output current capability?

The device is rated to deliver a continuous output current of up to 5 A.